Many organisms have the ability to alter their development in the presence of predators, leading to predator-induced defenses that reduce vulnerability to predation. In the water flea Daphnia pulex, small protuberances called 'neckteeth' form in the dorsal neck region in response to kairomone(s) released by predatory phantom midges (Chaoborus larvae). Although previous studies suggested that ka...

Two traditional species in the Daphnia pulex group (0. pulex and D. pulicmiu) are not completely reproductively isolated. The microhabitats they dominate are distinct but overlap geographically, and migration between the microhabitats is not uncommon. Their species identity is not fully supported by a recent molecular study. A laboratory experiment shows that Daphnia clones isolated from two po...

Ovaries were taken from five sexually mature amphipods: Gammarus fossarum, Gammarus pulex, Gammarus roeseli, Hyallela azteca and Parhyale hawaiensis. The soluble proteome extracted from individual pair of ovaries from five biological replicates was trypsin digested and the resulting peptides were analyzed by high resolution tandem mass spectrometry. The spectra were assigned with four protein s...

A concentration of lindane (y-hexachlorocyclohexane) of 0.05 mg liter-‘, much lower than the 48-h lethal concentration (LC,,) of 3.8 mg liter-‘, resulted in a 25% depression in the frequency of movements of filtering limbs and mandibles of Daphnia pulex in a food-free medium. Different instars (from 2nd to 8th) were affected to the same extent. Animals 6-l 2 h after molting were more sensitive ...