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Temperature alters the predator-prey size relationships and size-selectivity of Southern Ocean fish

Author

Listed:
  • Patrick Eskuche-Keith

    (University of Essex
    British Antarctic Survey)

  • Simeon L. Hill

    (British Antarctic Survey)

  • Lucía López-López

    (Oceanographic Centre of Santander (CN IEO, CSIC))

  • Benjamin Rosenbaum

    (German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig
    Friedrich Schiller University Jena)

  • Ryan A. Saunders

    (British Antarctic Survey)

  • Geraint A. Tarling

    (British Antarctic Survey)

  • Eoin J. O’Gorman

    (University of Essex)

Abstract

A primary response of many marine ectotherms to warming is a reduction in body size, to lower the metabolic costs associated with higher temperatures. The impact of such changes on ecosystem dynamics and stability will depend on the resulting changes to community size-structure, but few studies have investigated how temperature affects the relative size of predators and their prey in natural systems. We utilise >3700 prey size measurements from ten Southern Ocean lanternfish species sampled across >10° of latitude to investigate how temperature influences predator-prey size relationships and size-selective feeding. As temperature increased, we show that predators became closer in size to their prey, which was primarily associated with a decline in predator size and an increase in the relative abundance of intermediate-sized prey. The potential implications of these changes include reduced top-down control of prey populations and a reduction in the diversity of predator-prey interactions. Both of these factors could reduce the stability of community dynamics and ecosystem resistance to perturbations under ocean warming.

Suggested Citation

  • Patrick Eskuche-Keith & Simeon L. Hill & Lucía López-López & Benjamin Rosenbaum & Ryan A. Saunders & Geraint A. Tarling & Eoin J. O’Gorman, 2024. "Temperature alters the predator-prey size relationships and size-selectivity of Southern Ocean fish," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-48279-0
    DOI: 10.1038/s41467-024-48279-0
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    References listed on IDEAS

    as
    1. Angus Atkinson & Simeon L. Hill & Evgeny A. Pakhomov & Volker Siegel & Christian S. Reiss & Valerie J. Loeb & Deborah K. Steinberg & Katrin Schmidt & Geraint A. Tarling & Laura Gerrish & Sévrine F. Sa, 2019. "Krill (Euphausia superba) distribution contracts southward during rapid regional warming," Nature Climate Change, Nature, vol. 9(2), pages 142-147, February.
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