Effects of fish chemical cues on vertical migration behavior of Chaoborus

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Abstract
I quantified the diel vertical distributions of Chaoborus (phantom midge) larvae in water that had been conditioned by fish or not exposed to fish, using flow‐through laboratory columns and reciprocal transfers of larvae between a pond with fish and another without fish. The larvae that received fish‐conditioned water underwent a significantly greater intensity of migration than did those that received fish‐free water. Results support the hypothesis that Chaoborus larvae alter their vertical migration behavior in response to the presence of planktivorous fish, in particular, to associated chemical cues. Their behavioral flexibility in migrating permits response to a patchy environment that is variable both seasonally and between habitats.

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