UV radiation affects anti-predatory defense traits in Daphnia pulex

Franceen Eshun-Wilson, Raoul Wolf, Tom Andersen, Dag Hessen & Erik Sperfeld
In aquatic environments prey perceive predator threats by chemical cues called kairomones, which can induce changes in their morphology, life histories and behavior. Predator-induced defenses have allowed for prey, such as Daphnia pulex, to avert capture by common invertebrate predators, such as Chaoborus sp. larvae. However, the influence of additional stressors, such as ultraviolet radiation (UVR), on the Daphnia-Chaoborus interaction is not settled as UVR may for instance deactivate the kairomone. In laboratory experiments, we...
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