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Related Experiment Video

Updated: Jun 24, 2026

Assaying Predatory Feeding Behaviors in Pristionchus and Other Nematodes
06:27

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Published on: September 4, 2016

Reverse diel vertical migration: an escape from invertebrate predators.

M D Ohman, B W Frost, E B Cohen

    Science (New York, N.Y.)
    |June 24, 1983
    PubMed
    Summary
    This summary is machine-generated.

    Marine copepods Pseudocalanus sp. in Dabob Bay display reverse diel vertical migration, avoiding predators. This predator avoidance reduces mortality, potentially overcoming migration costs.

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    Area of Science:

    • Marine biology
    • Zooplankton ecology
    • Behavioral ecology

    Background:

    • Diel vertical migration (DVM) is common in marine zooplankton.
    • Pseudocalanus sp. in Dabob Bay exhibits an atypical reverse DVM.
    • Nocturnal invertebrate predators perform normal DVM in the same environment.

    Purpose of the Study:

    • To investigate the ecological implications of reverse DVM in Pseudocalanus sp.
    • To determine the impact of predator avoidance on Pseudocalanus sp. survival.
    • To assess the demographic consequences of DVM across a thermal gradient.

    Main Methods:

    • Observation of Pseudocalanus sp. and predator migration patterns.
    • Spatial overlap analysis between copepods and predators.
    • Life table analysis to model population dynamics.

    Main Results:

    • Pseudocalanus sp. demonstrated reverse DVM, while predators showed normal DVM.
    • Reduced spatial overlap between Pseudocalanus sp. and predators was observed.
    • Life table analysis indicated that a 16% reduction in mortality could offset DVM costs.

    Conclusions:

    • Reverse DVM in Pseudocalanus sp. is a strategy to minimize predation.
    • Predator avoidance significantly enhances survival rates for adult female Pseudocalanus sp.
    • The demographic benefits of reduced mortality can outweigh the energetic costs of migrating across thermal gradients.