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Prey selectivity of Piona exigua, a planktonic water mite by Margaret I. Butler; Carolyn W. Burns is a Environmental Science article available to read on EtoBox.

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Females, males and nymphs of Piona exigua were observed during prey capture and ingestion. The encounter radius of the mite was very small, allowing the escape of some crustaceans, such as the calanoid copepod Boeckella. Cladocerans, such as Bosmina or Chydorus, with little or no pre-contact escape response were the most vulnerable to mite predation. Preference values in size-selection experiments varied widely between individual mites. Adult mites presented with two sizes of Daphnia carinata generally preferred the smaller prey. When four sizes were presented simultaneously, however, the preferences of female mites for each size were not significantly different. Patterns of prey selection varied with predator age and sex; for example, female mites preferred Daphnia to Simocephalus, Ceriodaphnia and Chydorus, while nymphs showed a strong preference for Chydorus over Ceriodaphnia. When two prey types were present in equal proportions, differences in total prey density (range 5 or 10/1 - 30 or 50/1) did not alter preferences between the prey species. The preference of female mites for a particular prey type generally increased with increasing relative abundance of the prey type in ea

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Author

Margaret I. Butler; Carolyn W. Burns

Publisher

Springer-Verlag; Springer Verlag; Springer Science and Business Media LLC (ISSN 0029-8549)

Published

1991

Language

EN

Field

Environmental Science (Physical Sciences)