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  • 1
    Electronic Resource
    Electronic Resource
    Use of fluorescently labelled algae to measure the clearance rate of the rotifer Keratella cochlearis (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 33 (1995), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: 1. Fluorescently labelled algae (FLA) were used to measure clearance rates of the rotifer Keratella cochlearis. The freshwater algae Chlorella vulgaris and Stichococcus bacillaris were labelled with a fluorescent dye, 5-(4,6-dichlorotriazin-2-yl) aminofluorescein (DTAF), following a modified staining procedure.2. Keratella cochlearis ingested both algal species. Clearance rates on tracer foods varied between 2.4 and 6.9 μl ind−1 h−1, which are comparable with those determined using other techniques.3. The main drawback of the FLA technique was that only a little more than one-third of the total amount of algal cells of both C, vulgaris and S. bacillaris were well stained with the dye (DTAF), despite the use of a higher concentration of dye and a longer staining period than recommended in the literature.4. The FLA method can be successfully applied in grazing studies involving size selection and competition for food among zooplankton. The method complements existing techniques for measuring the clearance and ingestion rates of filter-feeders.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1995.tb00397.x
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of the non-indigenous cladoceran Cercopagis pengoi on the lower food web of Lake Ontario (2003)
    Oxford, UK : Blackwell Science Ltd
    Freshwater biology 48 (2003), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: 1. In North America, the invasive predatory cladoceran Cercopagis pengoi was first detected in Lake Ontario. We explored the impact of Cercopagis on the lower food web of Lake Ontario through assessments of historical and seasonal abundance of the crustacean zooplankton, by conducting feeding experiments on the dominant prey of the invader, and by estimating its food requirements.2. Between 1999 and 2001, a decrease in the abundance of dominant members of the Lake Ontario zooplankton community (Daphnia retrocurva, Bosmina longirostris and Diacyclops thomasi) coincided with an increase in the abundance of Cercopagis. Daphnia retrocurva populations declined despite high fecundity in all 3 years, indicating that food limitation was not responsible. Chlorophyll a concentration generally increased, concomitant with a decline in the herbivorous cladoceran zooplankton in the lake.3. Laboratory experiments demonstrated that Cercopagis fed on small-bodied species including D. retrocurva and B. longirostris.4. Consumption demand of mid-summer populations of Cercopagis, estimated from a bioenergetic model of the confamilial Bythotrephes, was sufficient to reduce crustacean abundance, although the degree of expected suppression varied seasonally and interannually.5. Predatory effects exerted by Cercopagis on the Lake Ontario zooplankton, while initially very pronounced, have decreased steadily as the species became established in the lake.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2427.2003.01154.x
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  • 3
    Electronic Resource
    Electronic Resource
    Changes in genetic structure of North American Bythotrephes populations following invasion from Lake Ladoga, Russia (2002)
    Oxford UK : Blackwell Science Ltd
    Freshwater biology 47 (2002), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: 1. We used allozyme electrophoresis to compare Bythotrephes longimanus (Crustacea: Onychopoda: Cercopagididae) from recently founded North American populations with those from native European populations, and to examine changes in genetic structure of North American populations over time.2. The genetic structure of North American populations in 1996 was similar to that of European populations, because of the disappearance of founder effects which distinguished North American from European populations in 1989.3. The Lake Ladoga, Russia population was more closely related to North American populations than to other European populations, consistent with non-genetic evidence implicating Lake Ladoga as the source of North American populations.4. Our results provide additional evidence of the presence of an invasion corridor that allows Urasian and Ponto-Caspian species to be introduced into North American freshwater ecosystems, and show that founder effects can erode over time following establishment of invasive species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2427.2002.00805.x
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  • 4
    Electronic Resource
    Electronic Resource
    Species composition of planktonic Rotifera, Cladocera and Copepoda in the littoral zone of Lake Ladoga (1996)
    Springer
    Hydrobiologia 322 (1996), S. 181-185 
    Details
    ISSN: 1573-5117
    Keywords: Zooplankton ; rotifera ; cladocera ; copepoda ; species list ; Lake Ladoga ; littoral zone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A species list of zooplankton from the littoral zone of Lake Ladoga is presented, with notes on population densities and distribution. The list, totalling 141 taxa of Rotifera, Cladocera and Copepoda, includes 36 taxa reported for the first time in Lake Ladoga. An inverse relationship has been observed between the values of Shannon-Weaver index of species diversity and mean individual body mass of zooplankton organisms in the communities associated with macrophytes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00031825
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  • 5
    Electronic Resource
    Electronic Resource
    Littoral zone of Lake Ladoga: ecological state evaluation (1996)
    Springer
    Hydrobiologia 322 (1996), S. 39-47 
    Details
    ISSN: 1573-5117
    Keywords: Lake Lagoda ; littoral zone ; monitoring ; pollution ; macrophytes ; periphyton ; phytoplankton ; zooplankton ; macrobenthos ; meibenthos
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The littoral zone of a lake is an important ecotone between terrestrial and aquatic systems. From the point of view of the lake ecosystem, much of the mineral, organic and toxic substances entering the lake from the drainage basin are transformed in the littoral zone by physical processes and biochemical pathways. The littoral zone of Lake Ladoga can be divided into three main regions: the shallow southern region, the fairly steep western and eastern shorelines, and the northern archipelago. In these regions, the communities of aquatic macrophytes, periphyton, phyto- and zooplankton and meio- and macrobenthos have been extensively studied. This paper presents numerical data on these communities, with special reference to comparisons between areas subjected to different degrees of anthropogenic loading. Most of the communities are characterized by high species diversity and spatial heterogeneity, especially among the macrophyte associations in which intensive production and decomposition takes place. Water dynamics and water exchange rate are the main abiotic factors in the formation of littoral communities. The characteristics of plant associations and bottom substrate, rather than pollution, appear as the most important factors structuring meio- and macrobenthic invertebrate communities in the littoral.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00031803
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  • 6
    Electronic Resource
    Electronic Resource
    Invertebrate communities associated with macrophytes in Lake Ladoga: effects of environmental factors (1996)
    Springer
    Hydrobiologia 322 (1996), S. 49-55 
    Details
    ISSN: 1573-5117
    Keywords: Lake Ladoga ; macrophytes ; pollution ; zooplankton ; macrobenthos ; meiobenthos
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Littoral invertebrate communities (meio- and macrobenthos and zooplankton) were studied in seven types of macrophyte associations commonly encountered in Lake Ladoga: in reed (Phragmites) beds on sand, soft and hard bottoms, in associations with the prevalence of Potamogeton spp., Carex spp., and Equisetum fluviatile, and in diverse vegetation stands with e.g. Polygonum amphibium, Cicuta virosa, Typha latifolia and Eleocharis acicularis. Some of the studied habitats were affected by sewage pollution, others were in comparatively undisturbed areas. Statistically significant differences between invertebrate communities in the different macrophyte associations were found. In stepwise multiple linear regression analysis the following factors were identified as determinants of abundance of aquatic invertebrates in macrophyte associations: shoot density, plant dry weight biomass, periphyton biomass, periphyton chlorophyll a, periphyton primary production, and concentrations of Sr, Mg, Ca, P, Mn, Zn, Pb and Cu. Pollution was shown to have a minor effect on the composition of littoral invertebrate communities. It is not possible to determine one single principle factor responsible for the structure and density of invertebrates in macrophyte communities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00031804
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  • 7
    Electronic Resource
    Electronic Resource
    The effect of fish on planktonic rotifers (1993)
    Springer
    Hydrobiologia 255-256 (1993), S. 289-296 
    Details
    ISSN: 1573-5117
    Keywords: Rotifera ; Cladocera ; fish ; interaction ; production ; biomanipulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The dynamics, community structure, and productivity of planktonic rotifers were studied during 3 years in two lakes near St. Petersburg (Russia). One lake was repeatedly stocked with larvae of the fish Coregonus peled; the other contained no fish. Fish addition led to a shift in plankton community structure. Population densities of some rotifer species (Keratella cochlearis, K. irregularis, Asplanchna priodonta) increased as a result of the elimination of large crustaceans by fishes during summer and autumn. An inverse relationship was found between the biomass of rotifers and Daphnia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00025851
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  • 8
    Electronic Resource
    Electronic Resource
    Rotifer assemblages in the Neva Bay, Russia: principles of formation, present state and perspectives (1995)
    Springer
    Hydrobiologia 313-314 (1995), S. 57-62 
    Details
    ISSN: 1573-5117
    Keywords: rotifers ; distribution ; turbidity ; effect of wind ; Neva Bay ; Neva River ; Lake Ladoga
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A comparative study of species composition, abundance and spatial distribution of the rotifers of Neva Bay (Gulf of Finland, Baltic Sea), between 1982–1993, was carried out. The rotifer fauna in the central basin of Neva Bay is determined by and originates in Lake Ladoga and is very similar to that of the Neva River. High turbidity and effect of winds affecting water residence time influence composition and density of rotifers in this shallow estuary. The importance of rotifer assemblages for evaluation of the quality of the estuary is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00025931
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  • 9
    Electronic Resource
    Electronic Resource
    Carbon content of some freshwater rotifers (1998)
    Springer
    Hydrobiologia 287-388 (1998), S. 355-360 
    Details
    ISSN: 1573-5117
    Keywords: Rotifers ; carbon content
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Carbon content of rotifers from 14 species ( Keratella cochlearis, K. c. tecta, K. c. hispida, K. ticinensis, K. quadrata, Polyarthra remata, P. vulgaris, P. major, P. euryptera, Synchaeta sp., S. stylata, S. pectinata, Trichocerca capucina, Asplanchna priodonta) was determined with the high temperature combustion method of Salonen (1979). Rotifers for the carbon analysis were collected from different fresh water bodies in Russia (Lake Ladoga) and Finland (lakes Pohjalampi, Varaslampi, and two small ponds in Lammi). Average individual carbon mass of rotifers varied between 0.0064 and 0.058 μg in Keratella spp., 0.012 and 0.051 μg in Polyarthra spp., 0.020 and 0.133 μg in Synchaeta spp., 0.162 and 0.555 μg in A. priodonta. The carbon level in the studied rotifer species differed 100-fold ranging from 0.31% WW in A. priodonta to 31.5% WW in K. c. tecta. Body length/carbon mass and body volume/carbon mass regressions were established for the studied rotifers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017092021816
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  • 10
    Electronic Resource
    Electronic Resource
    Carbon content of some freshwater rotifers (1998)
    Springer
    Hydrobiologia 387-388 (1998), S. 355-360 
    Details
    ISSN: 1573-5117
    Keywords: Rotifers ; carbon content
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Carbon content of rotifers from 14 species ( Keratella cochlearis, K. c. tecta, K. c. hispida, K. ticinensis, K. quadrata, Polyarthra remata, P. vulgaris, P. major, P. euryptera, Synchaeta sp., S. stylata, S. pectinata, Trichocerca capucina, Asplanchna priodonta) was determined with the high temperature combustion method of Salonen (1979). Rotifers for the carbon analysis were collected from different fresh water bodies in Russia (Lake Ladoga) and Finland (lakes Pohjalampi, Varaslampi, and two small ponds in Lammi). Average individual carbon mass of rotifers varied between 0.0064 and 0.058 μg in Keratella spp., 0.012 and 0.051 μg in Polyarthra spp., 0.020 and 0.133 μg in Synchaeta spp., 0.162 and 0.555 μg in A. priodonta. The carbon level in the studied rotifer species differed 100-fold ranging from 0.31% WW in A. priodonta to 31.5% WW in K. c. tecta. Body length/carbon mass and body volume/carbon mass regressions were established for the studied rotifers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017092021816
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