Effects of a partially closed area in the North Sea (“plaice box”) on stock development of plaice

Pastoors, M.A.

doi:10.1006/jmsc.2000.0586

Cited by 99 publications

(69 citation statements)

References 19 publications

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“…In effect, all measures are made against what is essentially a moving background that is independent of closures. In terms of the biological community under study here, it was expected that cod and perhaps other demersal fishes would increase, and crustaceans decline, over the period under study Rose and Rowe 2015), independent of the closure, largely as a result of changing production (e.g., Pastoors et al 2000). Both changes were observed, and against that background we measured significant differences in response between the closed and open areas.…”

Section: Discussionmentioning

confidence: 75%

Effects of closing bottom trawling on fisheries, biodiversity, and fishing communities in a boreal marine ecosystem: the Hawke Box off Labrador, Canada

Kincaid

Rose

2017

Can. J. Fish. Aquat. Sci.

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Abstract:The Hawke Box is an offshore area (8610 km 2 ) of the boreal Northwest Atlantic that at the request of local fishers was closed to trawling and gillnetting in 2003, but remained open to seasonal snow crab (Chionocetes opilio) pot fishing. Closure was a precautionary management measure primarily to sustain the crab fishery and secondarily to conserve cod known to aggregate there. Fall (1996Fall ( -2013Fall ( ) and spring (1996Fall ( -2003Fall ( , 2015 surveys indicated that biological community assemblages changed significantly before-after and inside-outside the closure (PERMANOVA P < 0.01). Crab fishery data (1996)(1997)(1998)(1999)(2000)(2001)(2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010)(2011)(2012)(2013) indicated that landings and relative production declined throughout the region after closure, but was significantly more outside than inside. Atlantic cod (Gadus morhua) increased inside and outside the closure, and several other demersal species increased significantly more inside. The Hawke Box provides a unique boreal area for the study of restrictions on trawling and gillnetting in an area with historically strong fisheries, restrictions that are strongly supported by local fishers. The overall evidence suggests that within a decade the Hawke Box has benefited fisheries communities, fisheries production, and biodiversity conservation.Résumé : La Hawke Box est une zone extracôtière (8610 km 2 ) de l'Atlantique Nord-Ouest boréal qui, à la demande de pêcheurs locaux, a été fermée à la pêche au chalut et au filet maillant en 2003, mais est demeurée ouverte à la pêche au casier saisonnière au crabe des neiges (Chionoecetes opilio). La fermeture constituait une mesure de gestion préventive visant en premier lieu à soutenir la pêche au crabe et, en deuxième lieu, à conserver les morues qui se regroupent dans cette zone. Des évaluations automnales (1996-2013) et printanières (1996-2003, 2015) indiquent que les assemblages de la communauté biologique ont changé de manière significative après la fermeture et diffèrent selon qu'ils sont à l'intérieur ou à l'extérieur de la zone visée par la fermeture (P de l'analyse PERMANOVA < 0,01). Des données sur la pêche au crabe (1996-2013) indiquent que les débarquements et la production relative ont baissé dans toute la région après la fermeture, mais significativement plus à l'extérieur qu'à l'intérieur de la zone de fermeture. L'abondance de la morue (Gadus morhua) a augmenté tant à l'intérieur qu'à l'extérieur de la zone, et celle de plusieurs autres espèces démersales a augmenté significativement plus à l'intérieur de la zone. La Hawke Box constitue une zone boréale unique pour l'étude des restrictions sur la pêche au chalut et au filet maillant dans une région caractérisée par des pêches traditionnellement fortes, restrictions fortement soutenues par les pêcheurs locaux. Dans l'ensemble, les données probantes portent à croire que, en une décennie, la Hawke Box a été bénéfique pour les collectivités de pêcheurs, la production des pêches et la conservat...

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Section: Discussionmentioning

confidence: 75%

Effects of closing bottom trawling on fisheries, biodiversity, and fishing communities in a boreal marine ecosystem: the Hawke Box off Labrador, Canada

Kincaid

Rose

2017

Can. J. Fish. Aquat. Sci.

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“…Conversely density-dependent variations in juvenile mortality have been documented in exploited populations of fishes such as Gadus morhua, Pleuronectes platessa, Merlangius merlangus, Solea solea, Merluccius productus and Epinephelus merra (Beverton & Illes 1992a, b;Myers & Cadigan 1993b;Butler & Nishimoto 1997;Letourneur et al 1998;Pastoors et al 1998), as well as for the spiny lobsters Panulirus cygnus, P. marginatus and Jasus spp. (Chittleborough & Phillips 1975;Polovina 1989;Pollock 1993).…”

Section: Natural Mortalitymentioning

confidence: 99%

“…Few studies address density-dependent responses in the context of protected populations (Buxton 1993;Ferreira & Russ 1995;Macpherson et al 1997;Pastoors et al 1998). In principle, compensatory changes in life-history parameters opposite to those ones described in exploited stocks should be expected when populations are allowed to recover in MPAs.…”

Section: Introductionmentioning

confidence: 99%

Density dependence in marine protected populations: a review

et al. 2000

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SummaryThe cessation or reduction of fishing in marine protected areas (MPAs) should promote an increase in abundance and mean size and age of previously exploited populations. Thus density-dependent changes in life-history characteristics should occur when populations are allowed to recover in MPAs. In this review, we synthesize the existing information on resource limitation in marine ecosystems, densitydependent changes in life-history traits of exploited populations and evidence for biomass export from MPAs. Most evidence for compensatory changes in biological variables has been derived from observations on populations depleted by high fishing mortality or on strong year classes, but these changes are more evident in juveniles than in adults and in freshwater rather than in marine systems. It is unclear if adults of exploited marine populations are resource limited. This may suggest that exploited populations are controlled mainly by density-independent processes, which could be a consequence of the depleted state of most exploited populations. MPAs could be a useful tool for testing these hypotheses. If we assume that resources become limiting inside MPAs, it is plausible that, if suitable habitats exist, mobile species will search for resources outside of the MPAs, leading to export of biomass to areas which are fished. However, it is not possible to establish from the available data whether this export will be a response to resource limitation inside the MPAs, the result of random movements across MPA boundaries or both. We discuss the implications of this process for the use of MPAs as fisheries management tools.

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“…Herudover har rekrutteringen til bestanden vaeret lav i starten af 90erne i forhold til midten af 80erne. Endelig peges der på, at observerede aendringer i økosystemet i den sydøstlige Nordsø, udtrykt som aendringer i udbredelsen af bundfisk og epibenthos, kan have vaeret med til at udviske effekten af rødspaettekassen (Pastoors et al 2000). De samme forfattere konkluderer, at eksemplet med rødspaettekassen advarer imod, at brugen af lukkede områder (MPA'er) -selv om de intuitivt synes attraktive -"may be a less straigthforward mangement tool.…”

Section: Resultaterunclassified