Effects of altered offshore food webs on coastal ecosystems emphasize the need for cross-ecosystem management.

Ambio
Britas Klemens ErikssonUlf Bergström

Abstract

By mainly targeting larger predatory fish, commercial fisheries have indirectly promoted rapid increases in densities of their prey; smaller predatory fish like sprat, stickleback and gobies. This process, known as mesopredator release, has effectively transformed many marine offshore basins into mesopredator-dominated ecosystems. In this article, we discuss recent indications of trophic cascades on the Atlantic and Baltic coasts of Sweden, where increased abundances of mesopredatory fish are linked to increased nearshore production and biomass of ephemeral algae. Based on synthesis of monitoring data, we suggest that offshore exploitation of larger predatory fish has contributed to the increase in mesopredator fish also along the coasts, with indirect negative effects on important benthic habitats and coastal water quality. The results emphasize the need to rebuild offshore and coastal populations of larger predatory fish to levels where they regain their control over lower trophic levels and important links between offshore and coastal systems are restored.

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Citations

May 1, 2013·Proceedings of the National Academy of Sciences of the United States of America·Christian AlsterbergKristina Sundbäck
Jun 9, 2012·Ecology Letters·Johan S EklöfLars Gamfeldt
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Aug 29, 2020·Communications Biology·Johan S EklöfUlf Bergström
Oct 28, 2020·Proceedings of the National Academy of Sciences of the United States of America·Matthew A WhalenJ Emmett Duffy

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