Adaptive feeding behavior of Daphnia magna in response to short-term starvation

Article Abstract:

Prefeeding history affected feeding behavior as well as morphology of feeding appendages in Daphnia magna. Daphnia that were starved had a lower appendage beat rate which was behaviorally mediated and varied according to the food concentration at which the animals were cultured. Appendage beat rate of starved daphnids increased almost immediately when food was added, independent of the starvation period length (1-3 d). Animals cultured at a high food level did not respond to food addition after 1 h of starvation, whereas appendage beat rate increased in animals cultured at a lower food level. The results fit better with an optimal foraging strategy than with a maximal feeding strategy.

Food and nutrition, Freshwater fauna, Freshwater animals

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Environmental stress and local adaptation in Daphnia magna

Article Abstract:

Four differing populations of Daphnia magna zooplankton were studied to discover the effects of crowding chemicals, fish kairomones, and day length on their life-history traits. The observed changes in life-history characteristics could lead to differences in fitness under different regimes of predation. Populations from habitats with fish have the highest fitness under fish-predation schemes.

Zooplankton, Stress (Physiology), Adaptation (Biology), Evolutionary adaptation

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Depth selection behavior, fish kairomones, and the life histories of Daphnia hyalina x galeata hybrid clones

Article Abstract:

Depth selection behavior, fish kairomones, and life histories of Daphnia hyalina x galeata hybrid clones are discussed for 22 genetically distinct lineages from different depths of the Schosee Lake in Germany in presence and absence of kairomones. Fish kairomones had a significant effect on all traits with the exception of age at maturity and relative length of the tail spine

Germany, Belgium, Statistical Data Included, Genetic aspects, Biological diversity, Biodiversity, Habitat selection, Lake ecology

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