Lobster and cod benefit from small-scale northern marine protected areas : inference from an empirical before - after control-impact study

Marine protected areas (MPAs) are increasingly implemented as tools to conserve and manage fisheries and target species. Because there are opportunity costs to conservation, there is a need for science-based assessment of MPAs. Here, we present one of the northernmost documentations of MPA effects t...

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Bibliographic Details
Published in:Proceedings of the Royal Society B: Biological Sciences
Main Authors: Moland, Even, Olsen, Esben Moland, Knutsen, Halvor, Garrigou, Pauline, Espeland, Sigurd Heiberg, Kleiven, Alf Ring, André, Carl, Knutsen, Jan Atle
Format: Article in Journal/Newspaper
Language:English
Published: The Royal Society 2013
Subjects:
VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921
VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497
atlantic cod
European lobster
Gadus morhua
Homarus gammarus
Online Access:http://hdl.handle.net/11250/138269
https://doi.org/10.1098/rspb.2012.2679
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Summary:Marine protected areas (MPAs) are increasingly implemented as tools to conserve and manage fisheries and target species. Because there are opportunity costs to conservation, there is a need for science-based assessment of MPAs. Here, we present one of the northernmost documentations of MPA effects to date, demonstrated by a replicated before-after control-impact (BACI) approach. In 2006, MPAs were implemented along the Norwegian Skagerrak coast offering complete protection to shellfish and partial protection to fish. By 2010, European lobster (Homarus gammarus) catch-per-unit-effort (CPUE) had increased by 245 per cent in MPAs, whereas CPUE in control areas had increased by 87 per cent. Mean size of lobsters increased by 13 per cent in MPAs, whereas increase in control areas was negligible. Furthermore, MPA-responses and population development in control areas varied significantly among regions. This illustrates the importance of a replicated BACI design for reaching robust conclusions and management decisions. Partial protection of Atlantic cod (Gadus morhua) was followed by an increase in population density and body size compared with control areas. By 2010, MPA cod were on average 5 cm longer than in any of the control areas. MPAs can be useful management tools in rebuilding and conserving portions of depleted lobster populations in northern temperate waters, and even for a mobile temperate fish species such as the Atlantic cod.

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