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Related Experiment Videos

Predator diversity hotspots in the blue ocean.

Boris Worm1, Heike K Lotze, Ransom A Myers

  • 1Biology Department, Dalhousie University, Halifax, Nova Scotia, Canada B3H 4J1. bworm@ifm.uni-kiel.de

Proceedings of the National Academy of Sciences of the United States of America
|August 9, 2003
PubMed
Summary

Marine biodiversity hotspots, crucial for conservation, are identified in the open ocean. These oceanic predator hotspots, found at mid-latitudes, can guide conservation efforts for vulnerable species.

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Area of Science:

  • Marine ecology
  • Conservation biology
  • Fisheries science

Background:

  • Terrestrial biodiversity hotspots are key conservation areas, but marine equivalents are understudied.
  • Large pelagic predators (tunas, sharks, billfishes, sea turtles) face overfishing and are vital to ocean ecosystems.
  • Understanding the distribution of these predators is critical for effective marine conservation.

Purpose of the Study:

  • To identify and characterize biodiversity hotspots for oceanic predators in the Atlantic and Pacific Oceans.
  • To investigate the relationship between predator hotspots and marine habitat features.
  • To evaluate conservation strategies based on identified hotspots.

Main Methods:

  • Analysis of scientific-observer records from pelagic longline fisheries.

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  • Spatial analysis to identify areas of high predator diversity (hotspots).
  • Use of closed-area models to assess conservation effectiveness.

    • Main Results:

    • Oceanic predators concentrate in distinct diversity hotspots, particularly at intermediate latitudes (20-30° N and S).
    • Hotspots are often associated with features like reefs, shelf breaks, and seamounts, and overlap with zooplankton/coral reef hotspots.
    • Protection of identified hotspots is predicted to be more effective than other area closures for safeguarding threatened pelagic predators.

    Conclusions:

    • The open ocean, often perceived as uniform, exhibits significant structure in species diversity.
    • Marine biodiversity hotspots for large predators can be identified and located.
    • Conservation strategies should prioritize these identified hotspots to protect vulnerable pelagic species and enhance marine ecosystem resilience.