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Global patterns in marine predatory fish.

P Daniël van Denderen1, Martin Lindegren2, Brian R MacKenzie2

  • 1Centre for Ocean Life, National Institute of Aquatic Resources, Technical University of Denmark, Kemitorvet B-202, 2800, Kongens Lyngby, Denmark. pdvd@aqua.dtu.dk.

Nature Ecology & Evolution
|November 29, 2017
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Summary
This summary is machine-generated.

Global distribution of large predatory fish is driven by ocean energy pathways. Low benthic energy favors pelagic species, while equal energy supports demersal fish, impacting fisheries and marine ecosystems.

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Area of Science:

  • Marine Ecology
  • Fisheries Science
  • Oceanography

Background:

  • Large teleost fish are crucial marine predators, vital for ocean ecosystems and human fisheries.
  • Significant differences exist in the distribution and feeding habits of pelagic and demersal fish across oceanic regions.
  • Factors governing the global distribution and productivity of these key predatory fish remain poorly understood.

Purpose of the Study:

  • To investigate the underlying factors determining the global distribution and productivity of large teleost predators.
  • To explain latitudinal differences in predatory fish distribution based on energy flow.
  • To understand how ecosystem changes may affect these important marine resources.

Main Methods:

  • Analysis of energy inflow at the base of pelagic and benthic food chains.
  • Comparison of fish predator distribution patterns in relation to different energy pathway productivities.
  • Modeling ecosystem responses to changes in energy flows.

Main Results:

  • Latitudinal distribution of predatory fish is primarily explained by energy availability in food chains.
  • A low-productivity benthic energy pathway promotes large pelagic species.
  • Equal energy productivities in both pathways favor large demersal generalists over pelagic specialists.

Conclusions:

  • Energy flow dynamics at the base of marine food webs significantly influence the distribution of large predatory fish.
  • Large teleost predators are vulnerable to alterations in ecosystem energy flows.
  • Findings provide insights for predicting the impact of global change on marine fisheries and ecosystems.