Abstract
Clearance rates of adult Acanthocyclops vernalis Fisher and Leptodora kindti Focke on high and low helmeted juvenile Daphnia retrocurva Forbes were estimated in laboratory microcosms. For the Acanthocyclops experiment, clearance rates declined exponentially with increases in both prey carapace length and relative helmet length. For the Leptodora experiment, clearance rates declined exponentially only with increases in prey carapace length. Behavioral observations of 4th instar Chaoborus americanus Johannsen larvae feeding on mixtures of long and short featured adult D. retrocurva revealed no difference in evasion and escape efficiencies for the two morphs. Approximately 71% of each morph successfully evaded Chaoborus strikes and 24% escaped contact. These results suggest that, of the three predators, only Acanthocyclops is negatively influenced by the relative helmet length of D. retrocurva, at least with the size classes of prey studied in these experiments.
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Havel, J.E. Predation of common invertebrate predators on long- and short-featured Daphnia retrocurva . Hydrobiologia 124, 141–149 (1985). https://doi.org/10.1007/BF00006796
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DOI: https://doi.org/10.1007/BF00006796