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Related Experiment Video

Updated: May 6, 2026

Individual Culturing of Tigriopus Copepods and Quantitative Analysis of Their Mate-guarding Behavior
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Density-dependent mortality in an oceanic copepod population.

M D Ohman1, H J Hirche

  • 1Station Zoologique, 06230 Villefranche-sur-Mer, France. mohman@ucsd.edu

Nature
|August 9, 2001
PubMed
Summary

Ocean zooplankton mortality rates are not constant but depend on population size. This finding impacts marine ecosystem models and understanding of ocean carbon cycling.

Area of Science:

  • Marine Ecology
  • Zooplankton Dynamics
  • Oceanography

Background:

  • Planktonic copepods are vital primary consumers supporting marine food webs and the ocean's biological carbon pump.
  • Accurate zooplankton mortality data is crucial for marine ecosystem models, yet remains scarce.
  • Existing models often assume linear mortality, which may not reflect reality.

Purpose of the Study:

  • To provide the first evidence of nonlinear, density-dependent mortality rates in open-ocean zooplankton.
  • To investigate the relationship between zooplankton population abundance and mortality.
  • To improve the accuracy of marine ecosystem modeling.

Main Methods:

  • Analysis of a high-frequency time series dataset.
  • Focus on egg mortality rates of the copepod Calanus finmarchicus.

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  • Quantification of per capita mortality as a function of adult female and juvenile abundance.

    • Main Results:

    • Demonstrated nonlinear, density-dependent mortality rates for Calanus finmarchicus eggs.
    • Per capita mortality rates were significantly influenced by the abundance of adult females and juveniles.
    • This indicates that zooplankton mortality is not constant but varies with population density.

    Conclusions:

    • Zooplankton population dynamics are significantly affected by time-dependent, density-dependent mortality, not just resource availability.
    • The functional form of zooplankton mortality in models critically influences predictions of pelagic ecosystem balance and carbon fluxes.
    • Findings necessitate revising zooplankton mortality parameterizations in marine ecosystem models for improved accuracy.