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  • 1
    Monograph available for loan
    Monograph available for loan
    Limnoökologie (1993)
    Stuttgart [u.a.] : Thieme
    Details Availability
    Call number: AWI G2-96-0470
    Description / Table of Contents: Die Organismen der Binnengewässer und deren Wechselwirkungen mit der Umwelt dienen hier als Modell zur Darlegung der Hauptprobleme in der wissenschaftlichen Ökologie von Gemeinschaften und Systemen: Wesentlichstes didaktisches Ziel ist die Verdeutlichung ökologischer Tatbestände als Teile einer experimentellen und theoretischen Wissenschaft auf der Grundlage einer mechanistischen und darwinistischen Auffassung. Strukturen und Vorgänge in den höheren hierarchischen Rängen (Gemeinschaften und Ökosysteme) werden als Ergebnis der Aktivitäten von Organismen verstanden - in einem Kompromiß zwischen dem Erwerb von Ressourcen und der Verminderung der Sterblichkeit.
    Type of Medium: Monograph available for loan
    Pages: 440 S.
    ISBN: 3137864011
    Series Statement: BIO - Flexibles Taschenbuch
    Branch Library: AWI Library
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  • 2
    Electronic Resource
    Electronic Resource
    Estimating the size at maturity in field populations of Daphnia (Cladocera) (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 30 (1993), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: 〈list xml:id="l1" style="custom"〉1 Two methods for estimating the average body size at the onset of reproduction were applied to populations of Daphnia hyalina. The first, ‘average maturation size’, assesses maturity by the relative length of abdominal processes of Daphnia; the second, ‘size at first reproduction’ (SFR), calculates the size class in which 50% of the maximum proportion of egg-bearing females is reached.2 The influence of environmental factors on the expression of the difference in length between the first and the second abdominal process was tested in the laboratory. Neither temperature nor chemical cues from predators affected the difference in length, but the processes were indistinguishable at very low food concentrations.3 During one season, D. hyalina exhibited pronounced changes in fecundity, proportion of egg-bearing adults and SFR. The pattern obtained by the two methods was similar in many cases, although maturation size estimated by the first method was slightly smaller than SFR obtained by the second method. Neither method gave reliable results during times of starvation (clear-water phase).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1993.tb00826.x
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  • 3
    Electronic Resource
    Electronic Resource
    Depth distribution of Daphnia in response to a deep-water algal maximum: the effect of body size and temperature gradient (2004)
    Oxford, UK : Blackwell Science Ltd
    Freshwater biology 49 (2004), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: 1. In the absence of fish predation, Daphnia exploiting a deep-water algal maximum are faced with a trade-off. They can either dwell in the epilimnion where development in the warm water is fast, but food shortage causes low egg production, or in the hypolimnion, where food availability is high but development is slow because of low temperatures.2. We tested the hypotheses that (i) depth distributions of various ontogenetic stages (size classes and egg-bearing females) differ because daphnids react to light with size-specific diel vertical migration (DVM) even in the absence of fish (residual predator avoidance hypothesis) and (ii) differently sized daphnids select different depths because the relative importance of temperature and food varies for ontogenetic stages (physiological hypothesis). We used large indoor mesocosms (Plankton Towers) to test these hypotheses experimentally.3. Temperature was the strongest factor governing the distribution, with larger proportions of the population dwelling in the food-rich hypolimnion if the temperature gradient was shallow. There were small but significant differences between ontogenetic stages during the day, but not at night. This suggested the existence of a ‘residual’ effect of light on depth distribution in the absence of a fish cue.4. Although large individuals exhibited greater amplitude of DVM, the physiological hypothesis had to be rejected. A stage-specific physiological effect is unlikely to be directly triggered by light, hence vertical movement of the individuals should not be synchronised. Rather, being forced into deeper layers by the residual light response during the day, large and egg-bearing females experience a lower average temperature during day than juveniles. They probably compensate for this by spending longer time periods in warm waters at night.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.2004.01190.x
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  • 4
    Electronic Resource
    Electronic Resource
    Experiments on the resistance of fish to rapid increase in hydrostatic pressure (1976)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 8 (1976), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: In a few hydro-electric pumping stations in the southern Black Forest it has been found that fish occurring in the high lying reservoirs could only arrive there from the river below after an upward transport through the pumping system. As there is a height difference of 400 m to overcome the fish must withstand a sudden pressure change of 40 atm. To test whether this is actually possible various species of fish were subjected suddenly to a pressure of 50 atm which was then reduced to 1 atm over a period of 10 min.No mortality occurred. Although the pressure shock symptoms exhibited by the different species of fish were variable, all appeared to be perfectly normal 2 h after the experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1976.tb03966.x
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  • 5
    Electronic Resource
    Electronic Resource
    Lake ecosystems Rapid evolution revealed by dormant eggs (1999)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 401 (1999), S. 446-446 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Natural selection can lead to rapid changes in organisms, which can in turn influence ecosystem processes. A key factor in the functioning of lake ecosystems is the rate at which primary producers are eaten, and major consumers, such as the zooplankton Daphnia, can be subject to strong ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/46731
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  • 6
    Electronic Resource
    Electronic Resource
    Egg bank investment (1995)
    [s.l.] : Nature Publishing Group
    Nature 377 (1995), S. 479-479 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] PLANKTONIC organisms in lakes are usually small and short-lived, responding quickly to changes in the environment and showing typical seasonal successions1. But some manage cunningly to increase their lifespan by assuming a dormant stage that settles into the sediment, where they wait for ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/377479a0
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  • 7
    Electronic Resource
    Electronic Resource
    Maternal control of resting-egg production in Daphnia (2001)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 414 (2001), S. 899-901 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Many planktonic organisms produce ‘resting’ stages when the environmental conditions deteriorate. Like seeds, resting stages can survive unfavourable conditions. The crustacean Daphnia normally reproduces by means of parthenogenetically produced normal, not resting, eggs—but ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/414899a
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  • 8
    Electronic Resource
    Electronic Resource
    Chemische Induktion von Verteidigungsmechanismen bei Süßwassertieren (1994)
    Springer
    Naturwissenschaften 81 (1994), S. 375-382 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01132689
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  • 9
    Electronic Resource
    Electronic Resource
    Chemische Induktion von Verteidigungsmechanismen bei Süßwassertieren (1994)
    Springer
    Naturwissenschaften 81 (1994), S. 375-382 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01132689
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  • 10
    Electronic Resource
    Electronic Resource
    A field study on the dependence of the fecundity of Daphnia spec. on food concentration (1978)
    Springer
    Oecologia 36 (1978), S. 363-369 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The dependency of the fecundity of Daphnia spec. on the food concentration was studied in Lake Constance. To eliminate the influence of temperature the number of eggs per adult female was plotted against the concentration of particulate carbon (〈50 μm) at the estimated time of the production of the eggs. The curve obtained is similar to the results of laboratory investigations. The minimum food concentration for egg production is slightly above 0.2 mg C/1; at 0.7 mg C/1 the curve reaches a plateau. The absolute values of the threshold concentration and the “incipient limiting level” are compared to laboratory results. It appears that the shift of the field curve to higher concentrations is caused by the imcomplete availability of the 50 μm particulate carbon fraction to the daphnids. Daphnia in Lake Constance seem to be food limited during most of the year.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00348062
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