ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • aquatic Oligochaeta  (35)
  • CR: 5.17
  • Springer  (54)
  • American Geophysical Union
  • Annual Reviews
  • Elsevier
  • 2020-2022
  • 1985-1989
  • 1980-1984  (54)
  • 1950-1954
  • 1984  (54)
Collection
Keywords
Publisher
  • Springer  (54)
  • American Geophysical Union
  • Annual Reviews
  • Elsevier
Years
  • 2020-2022
  • 1985-1989
  • 1980-1984  (54)
  • 1950-1954
Year
  • 1
    Electronic Resource
    Electronic Resource
    A potential method for the biharmonic equation (1984)
    Springer
    Numerische Mathematik 43 (1984), S. 105-119 
    Details
    ISSN: 0945-3245
    Keywords: AMS (MOS): 65N30 ; CR: 5.17
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary A new formulation of the Dirichlet problem for the biharmonic operator is presented. This gives rise to a simple numerical method to solve the above problem. Convergence is proved in the unidimensional case. Numerical results in one and two dimensional test problems are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01389641
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    A uniformly convergent difference scheme for a semilinear singular perturbation problem (1984)
    Springer
    Numerische Mathematik 43 (1984), S. 175-198 
    Details
    ISSN: 0945-3245
    Keywords: AMS(MOS): 65 L 10 ; CR: 5.17
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary We present a difference scheme for solving a semilinear singular perturbation problem with any number of turning points of arbitrary orders. It is shown that a solution of the scheme converges, uniformly in a perturbation parameter, to that of the continuous problem.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01390122
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Une méthode numérique pour les problèmes d'équilibre de corps hyperélastiques compressibles en grandes déformations (1984)
    Springer
    Numerische Mathematik 43 (1984), S. 199-224 
    Details
    ISSN: 0945-3245
    Keywords: AMS (MOS): 65 N 30 ; CR: 5.17
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Description / Table of Contents: Summary This paper uses Augmented Lagrangian techniques for the numerical solution of equilibrium problems of compressible hyperelastic bodies subjected to large deformations. The resulting method is illustrated by several numerical examples.
    Notes: Résumé Cet article applique les techniques de Lagrangien Augmenté à la résolution numérique des problèmes d'équilibre de corps hyperélastiques compressibles soumis à de grandes déformations. La méthode obtenue est illustrée par plusieurs exemples numériques.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01390123
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Superconvergence phenomenon in the finite element method arising from averaging gradients (1984)
    Springer
    Numerische Mathematik 45 (1984), S. 105-116 
    Details
    ISSN: 0945-3245
    Keywords: AMS(MOS) 65 N 30 ; CR: 5.17
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary We study a superconvergence phenomenon which can be obtained when solving a 2nd order elliptic problem by the usual linear elements. The averaged gradient is a piecewise linear continuous vector field, the value of which at any nodal point is an average of gradients of linear elements on triangles incident with this nodal point. The convergence rate of the averaged gradient to an exact gradient in theL 2-norm can locally be higher even by one than that of the original piecewise constant discrete gradient.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01379664
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Asymptotic bounds on the errors of one-step methods (1984)
    Springer
    Numerische Mathematik 45 (1984), S. 201-206 
    Details
    ISSN: 0945-3245
    Keywords: AMS(MOS): 65L05 ; CR: 5.17
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary Bulirsch and Stoer have shown how to construct asymptotic upper and lower bounds on the true (global) errors resulting from the solution by extrapolation of the initial value problem for a system of ordinary differential equations. It is shown here how to do this for any one-step method endowed with an asymptotically correct local error estimator. The one-step method can be changed at every step.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01389465
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    A finite element method for a boundary value problem of mixed type (1984)
    Springer
    Numerische Mathematik 44 (1984), S. 191-200 
    Details
    ISSN: 0945-3245
    Keywords: AMS (MOS): Primary 65M05, 65M10, 65M15 ; Secondary: 35M05 ; CR: 5.17
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary We consider the numerical solution of the boundary value problem (1) $$(1) Lu = k(y)u_{xx} + u_{yy} - c(x,y)u = f, u|_{\Gamma _0 \cup \Gamma _1 } = 0,$$ where $$k(y) \gtreqless 0$$ for $$y \gtreqless 0$$ Г 0 andГ 1 are parts of the boundary of a bounded simply connected regionG inR 2.G is bounded fory〉0 by a piecewise smooth curveГ 0 which intersects the liney=0 at the pointsA(−1,0) andB(0, 0). Fory〈0,G is bounded by a piecewise smooth curveГ 1 throughA, which meets the characteristic of (1) issued fromB at pointC, and by the curveГ 2 which consists of the portionCB of the characteristic throughB. Using a weak formulation based on different spaces of test and trial functions, we construct a Galerkin procedure for the above boundary value problem. Existence, uniqueness and uniform stability of an approximate solution is proven and a priori error bounds are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01410104
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    On the convergence of difference schemes for the approximation of solutionsu ∈ W 2 m (m〉0.5) of elliptic equations with mixed derivatives (1984)
    Springer
    Numerische Mathematik 44 (1984), S. 223-232 
    Details
    ISSN: 0945-3245
    Keywords: AMS: 65N10 ; CR: 5.17
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary The paper deals with such estimates of the rate of convergence of difference methods, which are compatible with the smoothness of the exact solutionu ∈ W 2 m (Ω),m〉0.5, of elliptic equations with mixed derivatives: The error in the norm of the discrete Sobolev spaceW 2 s (ω), ω denoting the set of grid points, is shown to be of the orderO(|h| m−s), 0≦s〈m.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01410107
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Contractivity of locally one-dimensional splitting methods (1984)
    Springer
    Numerische Mathematik 44 (1984), S. 247-259 
    Details
    ISSN: 0945-3245
    Keywords: AMS (MOS): 65L05 ; 65M05 ; 65M20 ; CR: 5.17
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary The aim of this paper is to study contractivity properties of two locally one-dimensional splitting methods for non-linear, multi-space dimensional parabolic partial differential equations. The term contractivity means that perturbations shall not propagate in the course of the time integration process. By relating the locally one-dimensional methods with contractive integration formulas for ordinary differential systems it can be shown that the splitting methods define contractive numerical solutions for a large class of non-linear parabolic problems without restrictions on the size of the time step.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01410109
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Monotone explicit iterations of the finite element approximations for the nonlinear boundary value problem (1984)
    Springer
    Numerische Mathematik 43 (1984), S. 419-437 
    Details
    ISSN: 0945-3245
    Keywords: AMS(MOS): 65N30 ; CR: 5.17
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary In this paper, we consider monotone explicit iterations of the finite element schemes for the nonlinear equations associated with the boundary value problem Δu=bu 2, based on piecewise linear polynomials and the lumping operator. These iterations construct the monotonically decreasing and increasing sequences, and convergence proofs are given. Finally, we present some numerical examples verifying the effectiveness of the theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01390183
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Free boundary problems with nonlinear source terms (1984)
    Springer
    Numerische Mathematik 43 (1984), S. 463-483 
    Details
    ISSN: 0945-3245
    Keywords: AMS(MOS): 65N30 ; CR: 5.17
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary The method of lines is used to semi-discretize the non-linear Poisson equation over a domain with a free boundary. The resulting multipoint free boundary problem is solved with a line Gauss-Seidel method which is shown to converge monotonically. The method of lines solution is then shown to converge to the continuous solution of the variational inequality form of the obstacle problem. Some numerical results for the diffusion-reaction equation indicate that the method is applicable to more general free boundary problems for nonlinear elliptic equations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01390185
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 11
    Electronic Resource
    Electronic Resource
    Finite element solution of diffusion problems with irregular data (1984)
    Springer
    Numerische Mathematik 43 (1984), S. 309-327 
    Details
    ISSN: 0945-3245
    Keywords: AMS(MOS): 65 N 30 ; CR: 5.17
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary Diffusion problems occuring in practice often involve irregularities in the initial or boundary data resulting in a local break-down of the solution's regularity. This may drastically reduce the accuracy of discretization schemes over the whole interval of integration, unless certain precautions are taken. The diagonal Padé schemes of order 2μ, combined with a standard finite element discretization, usually require an unnatural step size restriction in order to achieve even locally optimal accuracy. It is shown here that this restriction can be avoided by means of a sample damping procedure which preserves the order of the discretization and, in the case μ=1, does not increase the costs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01390130
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 12
    Electronic Resource
    Electronic Resource
    Numerical solution of retarded initial value problems: Local and global error and stepsize control (1984)
    Springer
    Numerische Mathematik 43 (1984), S. 343-360 
    Details
    ISSN: 0945-3245
    Keywords: AMS (MOS): 65L05 ; CR: 5.17
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary Retarded initial value problems are routinely replaced by an initial value problem of ordinary differential equations along with an appropriate interpolation scheme. Hence one can control the global error of the modified problem but not directly the actual global error of the original problem. In this paper we give an estimate for the actual global error in terms of controllable quantities. Further we show that the notion of local error as inherited from the theory of ordinary differential equations must be generalized for retarded problems. Along with the new definition we are led to developing a reliable basis for a step selection scheme.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01390178
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 13
    Electronic Resource
    Electronic Resource
    Asymptotic stability analysis of θ-methods for functional differential equations (1984)
    Springer
    Numerische Mathematik 43 (1984), S. 389-396 
    Details
    ISSN: 0945-3245
    Keywords: AMS(MOS): 65L20 ; CR: 5.17
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary Stability analysis of θ-methods for functional differential equations based on the test equation $$\begin{gathered} y'(t) = ay(t - \lambda ) + by(t),t 〉 0 \hfill \\ y(t) = \psi (t),t \in \left[ { - \lambda ,0} \right] \hfill \\ \end{gathered} $$ λ〉0, is presented. It is known thaty(t)→0 ast→∞ if and only if |b|〈−a and we investigate whether this property is inherited by the numerical solution approximatingy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01390181
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 14
    Electronic Resource
    Electronic Resource
    Feedback and adaptive finite element solution of one-dimensional boundary value problems (1984)
    Springer
    Numerische Mathematik 44 (1984), S. 75-102 
    Details
    ISSN: 0945-3245
    Keywords: AMS(MOS): 65L10 ; CR: 5.17
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary This paper examines the concepts of feedback and adaptivity for the Finite Element Method. The model problem concernsC 0 elements of arbitrary, fixed degree for a one-dimensional two-point boundary value problem. Three different feedback methods are introduced and a detailed analysis of their adaptivity is given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01389757
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 15
    Electronic Resource
    Electronic Resource
    Combined finite element and spectral approximation of the Navier-Stokes equations (1984)
    Springer
    Numerische Mathematik 44 (1984), S. 201-217 
    Details
    ISSN: 0945-3245
    Keywords: AMS(MOS): 65N30 ; CR: 5.17
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Description / Table of Contents: Resumé On présente une méthode d'approximation numérique des équations de Navier-Stokes possédant une direction de périodicité. Dans cette direction une méthode pseudospectrale basée sur des développements en série de Fourier est utilisée, dans les deux autres on applique une méthode d'éléments finis standard. On montre que la convergence est optimale et que les deux paramètres de discrétisation peuvent être choisis de façon indépendante.
    Notes: Summary We present a method for the numerical approximation of Navier-Stokes equations with one direction of periodicity. In this direction a Fourier pseudospectral method is used, in the two others a standard F.E.M. is applied. We prove optimal rate of convergence where the two parameters of discretization intervene independently.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01410105
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 16
    Electronic Resource
    Electronic Resource
    On the stability of bilinear-constant velocity-pressure finite elements (1984)
    Springer
    Numerische Mathematik 44 (1984), S. 219-222 
    Details
    ISSN: 0945-3245
    Keywords: AMS(MOS): 65N30 ; CR: 5.17
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary An analysis of the Babuška stability of bilinear/constant finite element pairs for viscous flow calculations is given. An unstable mode not of the checkerboard type is given for which the stability constant turns out to beO(h). Thus, the indicated spaces are not stable in general for numerical calculation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01410106
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 17
    Electronic Resource
    Electronic Resource
    On numerical asymptotic behavior of finite element solutions for parabolic equations (1984)
    Springer
    Numerische Mathematik 44 (1984), S. 285-300 
    Details
    ISSN: 0945-3245
    Keywords: AMS(MOS): 65N30 ; CR: 5.17
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary In this paper, we investigate the numerical asymptotic behavior of the finite element solutions for linear parabolic equations under some appropriate conditions. We also give some results of numerical experiments in the two dimensional problems to indicate the effectiveness of our results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01410112
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 18
    Electronic Resource
    Electronic Resource
    Partitioned adaptive Runge-Kutta methods and their stability (1984)
    Springer
    Numerische Mathematik 45 (1984), S. 283-300 
    Details
    ISSN: 0945-3245
    Keywords: AMS(MOS): 65L05 ; CR: 5.17
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary This paper deals with the solution of partitioned systems of nonlinear stiff differential equations. Given a differential system, the user may specify some equations to be stiff and others to be nonstiff. For the numerical solution of such a system partitioned adaptive Runge-Kutta methods are studied. Nonstiff equations are integrated by an explicit Runge-Kutta method while an adaptive Runge-Kutta method is used for the stiff part of the system. The paper discusses numerical stability and contractivity as well as the implementation and usage of such compound methods. Test results for three partitioned stiff initial value problems for different tolerances are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01389472
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 19
    Electronic Resource
    Electronic Resource
    Asymptotic theory of the global error and some techniques of error estimation (1984)
    Springer
    Numerische Mathematik 45 (1984), S. 51-74 
    Details
    ISSN: 0945-3245
    Keywords: MR65 M15 ; CR: 5.17
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary The error of the approximate solution obtained by discretising a functional equation can be shown under certain conditions to possess an asymptotic expansion in terms of some parameter which is usually a representative step-length. We consider the case of two-parameter expansions, which is particularly relevant to parabolic equations. We derive results for the existence of the expansion and for the application of the classical difference correction and of defect correction. The theory is illustrated by the discussion of a simple parabolic problem
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01379661
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 20
    Electronic Resource
    Electronic Resource
    The position of the Haplotaxidae in the evolution of oligochaete annelids (1984)
    Springer
    Hydrobiologia 115 (1984), S. 25-36 
    Details
    ISSN: 1573-5117
    Keywords: aquatic Oligochaeta ; annelids ; evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The Haplotaxidae have all the characteristics to support the hypothesis that they are the living descendents of the stem forms from which all of the Oligochaeta Clitellata (Orders Lumbriculida, Haplotaxida, Lumbricida, Tubificida) can be derived. The Aphanoneura are distinct from the Clitellata and are raised to a separate Class. There is no evidence to support the view that the elaborate setae of many Tubificida are derived from a polychaete ancestry; both are held to be independent modifications to aquatic life derived from a simple burrowing protoannelid with lumbricine setae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027889
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 21
    Electronic Resource
    Electronic Resource
    Oligochaete communities as biological descriptors of pollution in the fine sediments of rivers (1984)
    Springer
    Hydrobiologia 115 (1984), S. 127-129 
    Details
    ISSN: 1573-5117
    Keywords: aquatic Oligochaeta ; biological quality indices ; large rivers ; pollution ; fine sediments
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract This study emphasizes the usefulness of Oligochaeta communities as descriptors of pollution in the fine sediments of large rivers. Two indices of biological quality of fine bottoms are proposed and are related to chemical parameters of the water. Tentative proposals are made for an empirical classification of polluted fine sediments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027906
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 22
    Electronic Resource
    Electronic Resource
    Aspects of the phylogeny of the marine Tubificidae (1984)
    Springer
    Hydrobiologia 115 (1984), S. 37-44 
    Details
    ISSN: 1573-5117
    Keywords: aquatic Oligochaeta ; Tubificidae ; phylogeny
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A tentative phylogeny of the oligochaete family Tubificidae, with emphasis on the marine representatives, is presented. The scheme is based on the morphology and arrangements of prostate glands and the setal patterns. The rhyacodriline, more or less diffuse prostates are regarded as a primitive stage in prostate evolution, preceded only by the aprostate condition assumed for the ancestor of the family. An early split of the subfamily Rhyacodrilinae supposedly led to (1) a marine branch, from which evolved the highly diverse, exclusively marine subfamilies Phallodrilinae and Limnodriloidinae, and (2) a freshwater branch, which later divided into the Telmatodrilinae, Tubificinae and Aulodrilinae. The marine subfamilies invariably lack hair setae, whereas about half of the species within the other, freshwater subfamilies possess such setae in their dorsal bundles. Some marine genera, such as Monopylephorus (Rhyacodrilinae), Tubificoides and Clitellio (both Tubificinae) are regarded as recent off-shoots from the main freshwater stock. The families Naididae and Opistocystidae are considered likely to have evolved from rhyacodriline Tubificidae, whereas Phreodrilidae, the fourth family within the suborder Tubificina, is regarded as a sister group to the Tubificidae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027890
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 23
    Electronic Resource
    Electronic Resource
    Specific criteria in Grania (Oligochaeta, Enchytraeidae) (1984)
    Springer
    Hydrobiologia 115 (1984), S. 45-50 
    Details
    ISSN: 1573-5117
    Keywords: aquatic Oligochaeta ; oligochaete taxonomy ; Enchytraeidae ; Grania
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The structure of the penial bulb and male efferent duct system of Grania species may be used in addition to setal pattern and spermathecal shape to distinguish species. Six penial bulb types are distinguished: (1) a simple, small, glandular bulb surrounding the male pore; (2) a small, glandular bulb, with a large, associated, dorso-medial gland mass; (3) a small glandular bulb, medial to the male pore, with an elongate male bursa (the aglandular sac), the vas deferens exitting directly into the invaginated male pore; (4) a glandular bulb with an aglandular sac and a small, cuticular stylet embedded in the bulb, extending from the ectal end of the vas deferens; (5) a glandular bulb and an aglandular sac with a long stylet extending from the vas deferens, through the bulb into the sac; and (6) glandular bulb reduced or absent, with or without an aglandular sac; with a long stylet and other prominent modifications, usually muscular, of the vas deferens. The details of the male duct structure were consistent within specimens grouped on the basis of setal distribution and shape and detailed spermathecal structure. Diverse male duct patterns are found within the polytypic species G. macrochaeta and G. postclitellochaeta. The positions of the spermathecal and male pores in their respective segments are distinctive for some species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027891
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 24
    Electronic Resource
    Electronic Resource
    Capilloventer atlanticus gen. et sp.n., a member of a new family of marine Oligochaeta from Brazil (1984)
    Springer
    Hydrobiologia 115 (1984), S. 51-54 
    Details
    ISSN: 1573-5117
    Keywords: aquatic Oligochaeta ; Capilloventer ; Capilloventridae ; new family ; new genus ; Tubificida
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Specimens of a previously undescribed oligochaete from the Bay of Rio de Janeiro, Brazil were determined to belong to a new family of microdiles within the order Tubificida, suborder Enchytraeina. The specimens are characterized by dorsal and ventral hair setae, spermathecae in VII, testes in XI, ovaries in XII, and a clitellum. The number of primitive characters present in the new species indicate that it is a primitive member of the order that diverged early from the evolutionary line leading to the Enchytraeidae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027892
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 25
    Electronic Resource
    Electronic Resource
    A method of identifying immature specimens of marine Enchytraeidae (Oligochaeta) by vital staining of epidermal glands (1984)
    Springer
    Hydrobiologia 115 (1984), S. 55-58 
    Details
    ISSN: 1573-5117
    Keywords: aquatic Oligochaeta ; marine Enchytraeidae ; recognition of immature stages ; epidermal glands ; vital staining ; Neutral Red
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Epidermal glands in Enchytraeidae are arranged in several transverse rows in each segment. These glands are more or less inconspicuous. It is possible to show up the gland cells by vital staining with Neutral Red (dilution 1:25 000 to 1:200 000 in tap- or sea-water, pH 6.0–6.8). Studies using this staining method have shown that there is a distinct pattern of epidermal glands for each species of marine Enchytraeidae investigated. The possibility of distinguishing immature specimens of different marine enchytraeid species, found in one particular locality, is demonstrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027893
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 26
    Electronic Resource
    Electronic Resource
    Cytological aspects of oligochaete spermiogenesis (1984)
    Springer
    Hydrobiologia 115 (1984), S. 59-64 
    Details
    ISSN: 1573-5117
    Keywords: aquatic Oligochaeta ; spermatozoa ; spermatogenesis ; cell differentiation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Spermiogenesis in Oligochaeta occurs with peculiar modalities, common to all the species studied in this group. Gonial cells, produced in the testes, drop into coelomatic cavities (usually seminal vesicles) where they undergo a series of mitotic divisions, without cytodieresis, and finally meiosis. In the seminal vesicles, a series of ‘morulae’ is present, composed of 2, 4, 8, 18, 32, ... cells. The number of spermatids produced is variable, but is constant for each species. The process of spermiohistogenesis involves many steps, including: nuclear shaping, chromatin condensation, production of an acrosome, reduction of the number of mitochondria. The present knowledge of the mechanisms of cell differentiation, and the problem of the presence of two different sperm lines in some species is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027894
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 27
    Electronic Resource
    Electronic Resource
    Life-cycle and karyology of Branchiura sowerbyi Beddard (Oligochaeta, Tubificidae) (1984)
    Springer
    Hydrobiologia 115 (1984), S. 65-69 
    Details
    ISSN: 1573-5117
    Keywords: aquatic Oligochaeta ; Tubificidae ; life-cycle ; karyology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Data on the life-cycle of a population of Branchiura sowerbyi Beddard in a water-lily tank at the Botanical Garden in Padua are reported. The breeding period is from April to July, after which the reproductive system is partially resorbed (August–September) and reformed later in the autumn. The karyology of the species was also studied, and revealed 38 mitotic chromosomes in the gonia, and 19 bivalents in the primary spermatocytes and in the primary oocytes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027895
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 28
    Electronic Resource
    Electronic Resource
    Diet and histophysiology of the alimentary canal of Lumbricillus lineatus (Oligochaeta, Enchytraeidae) (1984)
    Springer
    Hydrobiologia 115 (1984), S. 71-81 
    Details
    ISSN: 1573-5117
    Keywords: aquatic Oligochaeta ; nutrition ; sediment ; histophysiology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Lumbricillus lineatus selectively ingests masses of organic and inorganic interstitial particles from a sand-clay substratum in the upper littoral zone. Particle-masses are ingested, passed along the esophagus and into the anterior intestine where the pH becomes acid. A- and C-esterases, acid β-galactosidase, acid phosphatase and β-N-acetylglucosaminidase are present in the epithelium, while the rotating food masses are surrounded by a membrane of sulphated, acid glycoprotein. These enzymes, with the exception of acid phosphatase and the addition of aminopeptidase M, are also present in the epithelia of the mid and posterior intestinal regions where the pH is alkaline. The cells in the ventral wall of the mid intestinal region contain high concentrations of alkaline phosphatase, acid β-galactosidase and β-N-acetylglucosaminidase. The food consists of absorbed organics and bacteria with absorption and intracellular digestion occurring along the intestine, particularly in the mid ventral region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027896
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 29
    Electronic Resource
    Electronic Resource
    The gutless oligochaete Phallodrilus leukodermatus Giere, a tubificid of structural, ecological and physiological relevance (1984)
    Springer
    Hydrobiologia 115 (1984), S. 83-89 
    Details
    ISSN: 1573-5117
    Keywords: aquatic Oligochaeta ; gutless oligochaetes ; structure ; ecology ; physiology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Phallodrilus leukodermatus is not only characterized by the complete absence of mouth, gut, anus and nephridia, but also by an exceptional dermal ultrastructure which is associated with gram-negative bacteria. The vertical distribution of the worms from Bermudian carbonate sands is also unusual in attaining population maximum at oligoxic or anoxic depths around the redox discontinuity (RPD) layer, where extremely high concentrations of amino acids and sugars are to be recorded. Based on results from current ecophysiological and ultrastructural studies, an interpretation of the unique biology of the worms is attempted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027897
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 30
    Electronic Resource
    Electronic Resource
    Asexual propagation and reproductive strategies in aquatic Oligochaeta (1984)
    Springer
    Hydrobiologia 115 (1984), S. 91-95 
    Details
    ISSN: 1573-5117
    Keywords: aquatic Oligochaeta ; asexual reproduction ; genetical-ecological mechanisms
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A great variety of asexual reproductive modes are known among aquatic oligochaetes. The main types of these modes are shortly described. Based upon observations on natural populations, the possible genetical and ecological implications of asexual reproduction are discussed. The following points are emphasized: (1) The often expressed expectations of a strong predominance of one particularly adaptive genotype is not born out. (2) In most cases, a number of genetically distinct clones are present in each population, and they show a strong differential distribution in heterogeneous environments, indicating an effective exploitation of the available resources. (3) Most cases of asexual propagation are reproductive strategies of their own and not escape mechanisms. (4) The mechanisms underlying asexual propagation are complex and involve many aspects of the life history. The great variety of types among aquatic oligochaetes offer particularly useful models for the study of these problems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027898
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 31
    Electronic Resource
    Electronic Resource
    Parthenogenesis in Tubificidae (1984)
    Springer
    Hydrobiologia 115 (1984), S. 97-99 
    Details
    ISSN: 1573-5117
    Keywords: aquatic Oligochaeta ; Tubificidae ; parthenogenesis ; experiment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The ability of tubificids to reproduce parthenogenetically following or in place of bisexual reproduction has been proved. During parthenogenesis the spermatogenesis ceases at an early stage of sexual cell development, which, together with some peculiarities of the structure of the sexual system, rules out the possibility of self-fertilization in the worms. For two years of cultivation the life cycles of 3 parthenogenetic generations in Tubifex tubifex and 2 in Limnodrilus hoffmeisteri were traced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027900
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 32
    Electronic Resource
    Electronic Resource
    Potential age of aquatic Oligochaeta (1984)
    Springer
    Hydrobiologia 115 (1984), S. 101-104 
    Details
    ISSN: 1573-5117
    Keywords: aquatic Oligochaeta ; life-cycle ; aquarial cultures
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The maximum lifetime of species with exclusively sexual reproduction covers 5–15 years or even more in aquaria, although most specimens die consecutively earlier. The zooids of paratomic species live some weeks or months, their clones usually less than a year, rarely for some years. In the species with facultative architomy (fragmentation) the clonal age also exceeds that of the individual, both lasting for several years. The actual lifetime of worms in nature may be shorter than in cultures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027901
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 33
    Electronic Resource
    Electronic Resource
    Growth of Stylaria lacustris (L.) (Oligochaeta, Naididae) (1984)
    Springer
    Hydrobiologia 115 (1984), S. 105-107 
    Details
    ISSN: 1573-5117
    Keywords: aquatic Oligochaeta ; Naididae ; growth ; experimental
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The peculiarities of the growth in weight and length of Stylaria lacustris (L.) on the basis of observations in experimental vessels are considered. The growth of this species fits a parabolic curve. The equations relating weight to absolute growth rate as well as weight to duration of life are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027902
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 34
    Electronic Resource
    Electronic Resource
    The biology of Psammoryctides barbatus (Grube) in English chalk streams (1984)
    Springer
    Hydrobiologia 115 (1984), S. 109-112 
    Details
    ISSN: 1573-5117
    Keywords: aquatic Oligochaeta ; Psammoryctides barbatus ; growth ; cocoon production
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The tubificid Psammoryctides barbatus is common in the sediments of English chalk streams. The species is primarily a spring and summer breeder with the most intense period of reproduction from April to June throughout its distribution in the river. Recruitment of juveniles takes place chiefly from June to August and most of the worms attain maturity in the following spring. In culture at 15 °C worms had attained 38 mm within 90 days of hatching and showed early signs of maturity. Growth rates and rates of cocoon production in culture are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027903
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 35
    Electronic Resource
    Electronic Resource
    Oxygen demand and long term changes of profundal zoobenthos (1984)
    Springer
    Hydrobiologia 115 (1984), S. 121-126 
    Details
    ISSN: 1573-5117
    Keywords: aquatic Oligochaeta ; eutrophication ; oxygen demand ; population dynamics ; zoobenthos of lakes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The paper attempts to combine the low oxygen content of the hypolimnion during stratification and the oxygen uptake of zoobenthos. Data of declining oxygen content in the hypolimnion and critical limits of respiration are combined for Chironomus anthracinus, Potamothrix hammoniensis and three species of Pisidium, P. casertanum, P. subtruncatum and P. henslowanum. The respiratory adaptation to low oxygen content influences both growth and population dynamics of the different species. The results have important bearing on eutrophication of the Lake Esrom ecosystem and temperate eutrophic lakes in general as well as the composition of profundal zoobenthos and its population dynamics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027905
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 36
    Electronic Resource
    Electronic Resource
    Cohort cultures of Psammoryctides barbatus (Grube) and Spirosperma ferox Eisen: a tool for a better understanding of demographic strategies in Tubificidae (1984)
    Springer
    Hydrobiologia 115 (1984), S. 113-119 
    Details
    ISSN: 1573-5117
    Keywords: aquatic Oligochaeta ; Tubificidae ; experimental ; density regulation ; bionomic strategies
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Laboratory research on the tubificids Psammoryctides barbatus and Spirosperma ferox was done. Embryonic development time, growth, time required to attain the first cocoon laying and egg production were estimated at different temperatures and population densities. The results allow us to demonstrate some intrinsic density regulation mechanisms in the profundal tubificid communities and substantiate the hypothesis that the succession from oligotrophic to eutrophic species in the profundal of lakes undergoing eutrophication is mainly based on their biotic characteristics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027904
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 37
    Electronic Resource
    Electronic Resource
    Eutrophication of Lakes Leman and Neuchâtel (Switzerland) indicated by oligochaete communities (1984)
    Springer
    Hydrobiologia 115 (1984), S. 131-138 
    Details
    ISSN: 1573-5117
    Keywords: aquatic Oligochaeta ; benthos ; eutrophication ; indicator communities ; lake ; tubificid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In 1978–80, oligochaete communities of meso-eutrophic Lake Léman (Lake of Geneva) were compared to those of mesotrophic Lake Neuchâtel. Worm species were classified into three groups corresponding to their increasing tolerance to eutrophication: (1) oligotrophic species, mostly Peloscolex velutinus, Stylodrilus heringianus; (2) mesotrophic species, mostly Potamothrix vejdovskyi, P. bedoti; (3) eutrophic species, mostly Potamothrix hammoniensis, P. heuscheri, Tubifex tubifex. In both lakes, eutrophic species constituted the bulk of the communities in terms of absolute abundance. However, relative abundance of mesotrophic and eutrophic species was higher in Lake Léman; oligotrophic species were more important in Lake Neuchâtel. These data confirmed the trophic classification of lakes based on chemical parameters. The number of zero values, which perturbated statistical analysis, was reduced by using species groupings instead of isolated species. Thus, making the lakes more comparable even if different species were present in each one. Relative density values based on all samples were distributed among 4 density classes for the 3 species groupings. The 12 resulting frequencies described the community structure expressed in terms of eutrophication. Furthermore, these frequencies may be used for comparison of eutrophication levels in several lakes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027907
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 38
    Electronic Resource
    Electronic Resource
    Lethal and sublethal tolerances of aquatic oligochaetes with reference to their use as a biotic index of pollution (1984)
    Springer
    Hydrobiologia 115 (1984), S. 139-144 
    Details
    ISSN: 1573-5117
    Keywords: aquatic Oligochaeta ; pollution ; indicators ; toxicity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A series of recent studies have been completed by the authors involving: 1) determining the lethal tolerances of 12 oligochaete species classified (from ecological studies) as tolerant, moderately tolerant and intolerant to selected chemical toxicants and environmental factors under defined bioassay conditions with and without sediment; 2) determining lethal tolerances of candidate species to toxicants in combination with a range of abiotic factors; 3) measuring respiratory stress imposed by exposure to individual and combined sublethal concentrations of toxicants and environmental factors; and, 4) determining differences in lethal tolerance and respiratory stress between individual and mixed species. Surprisingly few previous studies have been done in this area considering the importance of oligochaetes as field pollution indicators. The results of the above major studies coupled with histopathological work are reviewed. Data from these studies substantiate the present use of oligochaete species assemblages as indicators of organic pollution and suggest their use in the laboratory for toxicant screening tests. The range of responses of different oligochaete species to individual and combined stress is complex, particularly in mixed species, which provides useful indications of specific stress factors. The application of these experimental laboratory studies to field situations is described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027908
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 39
    Electronic Resource
    Electronic Resource
    Short term dynamics of the dominant annelids in a polyhaline temperate estuary (1984)
    Springer
    Hydrobiologia 115 (1984), S. 153-158 
    Details
    ISSN: 1573-5117
    Keywords: aquatic Oligochaeta ; long term changes ; population dynamics ; polychaetes ; recruitment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Weekly sampling over a two year period from a muddy sand bottom in the polyhaline York River, Virginia, U.S.A., clearly identified the pattern of recruitment and survival of the dominant annelid species. Three intermingled recruitment strategies and two survival patterns were observed, ranging from the classic opportunistic life style of mass recruitment over short time periods followed by mass mortality to prolonged recruitment with lower mortality. Qualitatively the annelid assemblage was very similar from year to year with most of the changes being quantitative. Oligochaetes, Tubificoides spp., were the most stable and characteristic members of the annelid assemblage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027910
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 40
    Electronic Resource
    Electronic Resource
    Oligochaeta of the middle Po River (Italy): principal component analysis of the benthic data (1984)
    Springer
    Hydrobiologia 115 (1984), S. 145-152 
    Details
    ISSN: 1573-5117
    Keywords: aquatic Oligochaeta ; benthos ; principal component analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The application of principal component analysis to two types of habitat (the benthos of macrophytes and of central river bed) enabled us to single out some of the factors that affect the dynamics and the structure of the oligochaete population and its various reactions to environmental conditions. As regards macrophytes, the distribution of the variables on the basis of the first component is correlated, to a certain extent, with a seasonal factor without any significant differences among sites. The largest population is most closely correlated with the summer months. In fact, we found that the Naididae and Tubificidae species generally develop in larger numbers at higher temperatures. For the Tubificidae, we could detect a precise seasonal cycle. In the central river bed habitat, the first component was correlated with the river discharge, which determines the granulometric characteristics of the sediment; we noticed a correlation among the sites that have the same characteristics, regardless of sampling site or date. The species which correlate most closely among themselves are the Tubificidae Limnodrilus hoffmeisteri, Tubifex tubifex, L. udekemianus and L. profundicola, which are very characteristic of environments that contain abundant organic matter. The second component is correlated with temperature, and hence with the availability of oxygen, which determines the presence and the abundance of more sensitive species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027909
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 41
    Electronic Resource
    Electronic Resource
    The occurrence of species of semi-aquatic Enchytraeidae (Oligochaeta) in Ireland (1984)
    Springer
    Hydrobiologia 115 (1984), S. 159-170 
    Details
    ISSN: 1573-5117
    Keywords: aquatic Oligochaeta ; Enchytraeidae ; environmental parameters ; ordination techniques
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The Enchytraeidae are essentially terrestrial oligochaetes but many species have marked aquatic tendencies. Over two thirds of recorded Irish species were found in soils which were submerged or frequently flooded and 35% showed a distinct preference for these conditions. Relatively few species were living in soils subject to drought. Red blood was present in 28 species, all but one from soils with more than 55% water. Cognettia sphagnetorum and C. glandulosa developed red blood in very wet conditions. In a survey of Irish wetlands, samples were taken from bog, heath, marsh, fen, margins of lakes and rivers, and saltmarsh. The influence of various environmental parameters was determined using ordination techniques. Magnesium and pH were found to be the most important factors. A high level of magnesium distinguished coastal sites and pH 5.2 separated two clusters representing acid peat and marsh-fen-aquatic sites. Groups of indicator species characterized each of the three clusters. The ecological distribution of the indicator species is described, and their usefulness in classifying enchytraeid communities is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027911
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 42
    Electronic Resource
    Electronic Resource
    The oligochaetes (Annelida, Oligochaeta) in a lake and a canal in the agricultural landscape of Poland (1984)
    Springer
    Hydrobiologia 115 (1984), S. 171-174 
    Details
    ISSN: 1573-5117
    Keywords: aquatic Oligochaeta ; diversity ; respiration ; production
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Data are presented concerning an investigation into the diversity, abundance, production and respiration of the oligochaete fauna in the eutrophic, polymictic Lake Zbechy and in a melioration canal in the Wielkopolska Region, an area of intensive agriculture. It was found that in the canal the average biomass of oligochaetes was about four times higher than in the lake. Oligochaetes expend 1.1–4 times more energy in respiration than in tissue production. Species diversity and species number are positively correlated, while the correlation between diversity and abundance is negative.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027912
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 43
    Electronic Resource
    Electronic Resource
    Oligochaeta of the epigean and underground fauna of the alluvial plain of the French upper Rhône (biotypological trial) (1984)
    Springer
    Hydrobiologia 115 (1984), S. 175-182 
    Details
    ISSN: 1573-5117
    Keywords: aquatic Oligochaeta ; biotypology ; French upper Rhône
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Within a framework of interdisciplinary research, a biotypological trial of the epigean and underground fauna (Oligochaeta and Aphanoneura) of the alluvial plain of the French upper Rhône is proposed, according to the partition of this hydrographic complex into superficial and subterranean functional sets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027913
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 44
    Electronic Resource
    Electronic Resource
    Comparison of different methods of water quality evaluation by means of oligochaetes (1984)
    Springer
    Hydrobiologia 115 (1984), S. 183-186 
    Details
    ISSN: 1573-5117
    Keywords: aquatic Oligochaeta ; water quality ; bioindication
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Using as examples water bodies in different geographical zones (Lake Ladoga, the River Sukhona, shallow-water ponds of the North Caucasus) the known methods of water quality evaluation by means of oligochaetes are considered. There is no unique universal method of pollution bioindication in. this way. In water bodies of all types the mass development of oligochaetes and the reduction of their species diversity are indications of. (1) large quantities of organic matter; (2) favourable oxygen regime; (3) absence or insignificant quantity of heavy metal solids, petroleum substances and agricultural chemicals; (4) intensive self-purification of the water body.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027914
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 45
    Electronic Resource
    Electronic Resource
    On aquatic Oligochaeta Lumbricomorpha in Europe (1984)
    Springer
    Hydrobiologia 115 (1984), S. 187-190 
    Details
    ISSN: 1573-5117
    Keywords: aquatic Oligochaeta ; Lumbricomorpha ; biology of aquatic earthworms ; breeding of aquatic earthworms
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Twelve species of aquatic earthworms have been found in European inland waters where they occupy different environments. Two species live exclusively in the sapropel, that is in the black fetid asphyctic mud, while four species can be found either in the sapropel or in the more oxygenated gyttja. The remaining species prefer this type of soil, but Eisenia spelaea in Italy lives only within submerged litter in mountain streams. The biology of these earthworms is discussed and the possibility of their utilization by man is considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027915
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 46
    Electronic Resource
    Electronic Resource
    Distribution and habitat characteristics of Naididae and Tubificidae in the inland waters of Israel and the Sinai Peninsula (1984)
    Springer
    Hydrobiologia 115 (1984), S. 197-205 
    Details
    ISSN: 1573-5117
    Keywords: aquatic Oligochaeta ; Naididae ; Tubificidae ; Israel & Sinai distribution ; habitat characteristics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Nineteen species of Naididae and fourteen species of Tubificidae were found in collections from inland waters in Israel and Sinai. The local distribution patterns of the majority of these species were determined. The ranges of several physical and chemical variables characterizing the habitats of each species were defined. A correlation was found between the distribution patterns of some species and the following variables: salinity, temperature, dissolved oxygen, current velocities and stability of the habitats.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027917
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 47
    Electronic Resource
    Electronic Resource
    Diversity and zoogeography of marine Tubificidae (Annelida, Oligochaeta) with notes on variation in widespread species (1984)
    Springer
    Hydrobiologia 115 (1984), S. 191-196 
    Details
    ISSN: 1573-5117
    Keywords: aquatic Oligochaeta ; Tubificidae ; zoogeography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The specific and generic diversities of the marine Tubificidae (Annelida, Oligochaeta) of the NE Pacific are compared to those of the NE and NW Atlantic as well as to those of Heron Island, Australia. Diversity in the NE Pacific is relatively high when compared to that of the NE Atlantic. The Tubificidae of the NW Atlantic (limited to the eastern coast of the USA) show two distinct zoogeographic regions: Florida to Cape Hatteras; Cape Hatteras to Massachusetts. Diversity, both in terms of the number of species and number of genera, is approximately the same in these two regions, and is similar to that of both the NE Pacific and Heron Island. Evidence suggests that the widespread marine species, in particular Tubificoides pseudogaster, have a range of morphotypes across their distributions. The apparent wide distributions of these species may be due to a taxonomy unable to resolve the differences between the morphotypes. The tubificid oligochaete fauna of the NE Atlantic appears impoverished compared to the other regions examined. The NE Pacific, NW Atlantic, and Heron Island regions are not dominated by one group of species while the NE Atlantic fauna is dominated by Tubificoides benedeni and Clitellio arenarius.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027916
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 48
    Electronic Resource
    Electronic Resource
    A taxonomic and faunistic survey of the marine Tubificidae and Enchytraeidae (Oligochaeta) of Italy. Introduction and preliminary results (1984)
    Springer
    Hydrobiologia 115 (1984), S. 207-210 
    Details
    ISSN: 1573-5117
    Keywords: aquatic Oligochaeta ; Tubificidae ; Enchytraeidae ; zoogeography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract On the basis of material collected along the Ligurian, Tyrrhenian, Ionic and Adriatic coasts of Italy, a tentative list of 26 species (18 tubificids, 8 enchytraeids) of marine Oligochaeta is presented. Most of the species are new to science, and it can therefore be concluded that there is a very high diversity of oligochaetes in the Mediterranean Sea.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027918
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 49
    Electronic Resource
    Electronic Resource
    Ecology and importance of Oligochaeta in the biocenosis of zoobenthos in lakes of the National Park of the Lithuanian SSR (1984)
    Springer
    Hydrobiologia 115 (1984), S. 211-214 
    Details
    ISSN: 1573-5117
    Keywords: aquatic Oligochaeta ; distribution according to sediment type
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract This paper aims to describe the ecology and determine the distribution of Oligochaeta according to sediment type, depth and other environmental factors in 21 lakes of the National Park of the Lithuanian SSR. Diagrams are included showing the distribution of the lakes according to the index of density and biomass of Oligochaeta in the trophic structure of biocenosis of the zoobenthos. Light is thrown on the problem of sediment composition as a significant factor in the distribution and development of aquatic Oligochaeta.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027919
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 50
    Electronic Resource
    Electronic Resource
    The distribution of aquatic oligochaetes in the fenland area of N.W. Overijssel (The Netherlands) (1984)
    Springer
    Hydrobiologia 115 (1984), S. 215-222 
    Details
    ISSN: 1573-5117
    Keywords: aquatic Oligochaeta ; fenland ; cluster analysis ; ecological groups
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A synoptic study of the aquatic ecosystems in the Dutch province of Overijssel revealed the presence of 33 oligochaete taxa in the fendland area of N.W. Overijssel. The material was collected at 101 sampling sites in 1981. Oligochaetes were grouped by means of a normal and inverse cluster analysis. Although most oligochaetes are quite biquitous, differences in occurrence and abundance were observed and related to minor differences in environmental parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027920
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 51
    Electronic Resource
    Electronic Resource
    Oligochaeta from profundal zones of Spanish reservoirs (1984)
    Springer
    Hydrobiologia 115 (1984), S. 223-230 
    Details
    ISSN: 1573-5117
    Keywords: aquatic Oligochaeta ; biogeography ; ecology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The profundal benthic fauna of 63 Spanish reservoirs was studied during 1972–75. Samples were taken in the deepest part of each reservoir with a modified Van Veen grab. The fauna was dominated by tubificid worms and chironomids. Sixteen species of Oligochaeta were found, two of them new for the Spanish fauna (Potamothrix heuscheri and Haber pyrenaicus). This was the first time H. pyrenaicus was found since the species was described in 1974 from the Pyrenees. Four species were frequent in the reservoirs (Limnodrilus hoffmeisteri, Tubifex tubifex, L. claparedeianus and Dero digitata) but only the first two were abundant as mature individuals. Another interesting fact is the high abundance of immature animals in all samples, accounting for more than 80% of the total individuals examined. The geographical distribution of all species in Spain and their relationship with the typology of Spanish reservoirs are discussed. There seems to be a correlation between the throphic status of the reservoirs and the relative proportion of L. hoffmeisteri as compared to T. tubifex, the number of individuals of the first species increasing with water eutrophication.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027921
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 52
    Electronic Resource
    Electronic Resource
    Two atavistic characters of some Lumbriculidae and their importance for the classification of Oligochaeta (1984)
    Springer
    Hydrobiologia 115 (1984), S. 15-17 
    Details
    ISSN: 1573-5117
    Keywords: aquatic Oligochaeta ; Lumbriculidae ; phylogeny
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The rudimentary atria, and the posterior sperm funnels and sperm ducts, which occur in some species of the Lumbriculidae, are discussed. It is shown that the posterior location of funnels and sperm ducts is the result of a forward shift of the atria, which refutes Stephenson's supposition that the Lumbriculidae is the most archaic family of the present-day Oligochaeta.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027887
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 53
    Electronic Resource
    Electronic Resource
    A phenetic and cladistic study of spermatozoal ultrastructure in the Oligochaeta (Annelids) (1984)
    Springer
    Hydrobiologia 115 (1984), S. 3-13 
    Details
    ISSN: 1573-5117
    Keywords: aquatic Oligochaeta ; oligochaete spermatozoa ; acrosome ; electron microscopy ; phenetics ; phylogeny
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Spermatozoal ultrastructure of nine oligochaete families has been examined for congruence with phylogenetic and taxonomic systems for the Oligochaeta based on general morphology, particularly the holomorphological hennigian analysis of Jamieson (1978a, 1980, 1983). Estimation of congruence has been made following phenetic and cladistic (phylogenetic) analysis. Correspondence, in phenograms and phylograms, of sperm types with taxonomic and phylogenetic groupings previously recognized is generally good. Departure from this rule in the similarity of the phreodrilid sperm to that of the Lumbricina suggests a corresponding alteration of fertilization biology in the phreodrilids. The results indicate that the Haplotaxidae lie at the base of the opisthopores though they do not unequivocally contraindicate acceptance of a Haplotaxis like form as a stem form of the Haplotaxida (opisthopores and Haplotaxidae) and Tubificida. An even more basal position for prosopores, now represented by the Lumbriculida, cannot yet be dismissed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027886
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 54
    Electronic Resource
    Electronic Resource
    Phylogenetic and taxonomic problems in freshwater Oligochaeta with special emphasis on chitinous structures in Tubificinae (1984)
    Springer
    Hydrobiologia 115 (1984), S. 19-23 
    Details
    ISSN: 1573-5117
    Keywords: aquatic Oligochaeta ; Tubificinae ; phylogeny ; taxonomy ; chitinous penis sheaths
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Setae and chitinous penis sheaths are the main characters used to distinguish genera and species of the subfamily Tubificinae. Genital setae and penis sheaths are of functional importance to facilitate copulation. Similar structures in different genera may be homologous or products of parallel evolution (homoiologous). Form and dimensions of the penis sheaths of many tubificine species are very variable. Transspecific overlap of quantitative species characters can make the determination of specimens in the genus Limnodrilus difficult. The configuration of the distal ends of the penis sheaths is an important character to distinguish Limnodrilus species. The definition of the intraspecific variability of this morphological character is problematic.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027888
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...