title: Effects of altered offshore food webs on coastal ecosystems emphasize the need for cross-ecosystem management.
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.
authors.affiliation: Department of Marine Benthic Ecology & Evolution, Centre for Ecological & Evolutionary Studies, University of Groningen, The Netherlands. b.d.h.k.eriksson@rug.nl
authors.forename: Britas Klemens
authors.initials: BK
authors.lastname: Eriksson
authors.forename: Katrin
authors.initials: K
authors.lastname: Sieben
authors.forename: Johan
authors.initials: J
authors.lastname: Eklöf
authors.forename: Lars
authors.initials: L
authors.lastname: Ljunggren
authors.forename: Jens
authors.initials: J
authors.lastname: Olsson
authors.forename: Michele
authors.initials: M
authors.lastname: Casini
authors.forename: Ulf
authors.initials: U
authors.lastname: Bergström
mesh_terms: D000818:Animals; D044822:Biodiversity; D018533:Biomass; D017753:Ecosystem; D005399:Fishes / Q000145:classification / Q000502:physiology; D020387:Food Chain; D011235:Predatory Behavior; D012623:Seawater