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Global patterns of predator diversity in the open oceans
Worm, B.; Sandow, M.; Oschlies, A.; Lotze, H.K.; Myers, R.A. (2005). Global patterns of predator diversity in the open oceans. Science (Wash.) 309(5739): 1365-1369
In: Science (Washington). American Association for the Advancement of Science: New York, N.Y. ISSN 0036-8075, more
Peer reviewed article  

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  • Worm, B.
  • Sandow, M.
  • Oschlies, A.
  • Lotze, H.K.
  • Myers, R.A.

    The open oceans comprise most of the biosphere, yet patterns and trends of species diversity there are enigmatic. Here, we derive worldwide patterns of tuna and billfish diversity over the past 50 years, revealing distinct subtropical "hotspots" that appeared to hold generally for other predators and zooplankton. Diversity was positively correlated with thermal fronts and dissolved oxygen and a nonlinear function of temperature (25°C optimum). Diversity declined between 10 and 50% in all oceans, a trend that coincided with increased fishing pressure, superimposed on strong El Niño-Southern Oscillation-driven variability across the Pacific. We conclude that predator diversity shows a predictable yet eroding pattern signaling ecosystem-wide changes linked to climate and fishing.

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