Behavioural response of plant-associated Eurycercus lamellatus (Ö.F. Müller) to different food sources and fish cues

摘要: The habitat preference and activity pattern of a large-bodied plant-associated chydorid, Eurycercus lamellatus, were experimentally tested under laboratory conditions using different food sources fish cues. In the absence epiphyton, we found significantly higher densities E. lamellatus on plants when concentrations phytoplankton high, while no differences for real hosting epiphytes. predator cues, preferred plants. Exposure to chemical cues released by 0+ roach (Rutilis rutilis) previously fed or Ceriodaphnia spp. induced shift from bottom experimental chambers sediment. However, level test animals varied between treatments. Test be more agitated (as measured intensity crawling jumping activities) in presence lamellatus-fed then exposed spp-fed roach. Most likely, conspecific behaviour which may an attempt bury within sediment avoid predation. Time series experiments showed almost immediate response addition animals, however, returned during next 7–24 h, most likely reflecting rapid degradation results suggest significant influence microcrustaceans littoral zones lakes.