GEOSCAN, résultats de la recherche


TitreThe impact of commercial fishing on the determination of habitat associations for sea scallops (Placopecten magellanicus, Gmelin)
AuteurSmith, S J; Black, J; Todd, B J; Kostylev, V E; Lundy, M J
SourceICES journal of marine science vol. 66, no. 9, 2009 p. 2043-2051, (Accès ouvert)
Séries alt.Secteur des sciences de la Terre, Contribution externe 20090442
ÉditeurOxford University Press (OUP)
Documentpublication en série
Mediapapier; en ligne; numérique
ProvinceRégion extracotière de l'est
Lat/Long OENS -66.4167 -65.5000 43.6667 43.1667
Sujetspeuplements biologiques; biomes; diversification biotique; écosystèmes; écologie marine; bathymétrie; topographie du fond océanique; topographie du fond océanique; distribution de la faune; assemblages fauniques; etudes fauniques; faunes; géologie de l'environnement; géologie marine
Illustrationslocation maps; tables; plots
ProgrammeLes géosciences à l'appui de la gestion des océans
Diffusé2009 07 10
Résumé(disponible en anglais seulement)
The sea scallop (Placopecten magellanicus) population off southwestern Nova Scotia in Scallop Fishing Area 29 has been monitored by an annual drag survey since the fishery started there in 2001. A new stratification scheme based on surficial geology maps from a multibeam bottom mapping and geology ground-truth project completed in 2004 in the area have been used for survey design since 2005. Survey data from before 2005 have been post-stratified using the new strata. The efficiency of the design with respect to variance reduction appears to have diminished over time suggesting that the association between scallop abundance and bottom type may not have been as strong or constant as first assumed. Modelling of the association between scallop abundance and bottom type and depth using a Bayesian hierarchical approach confirms this diminishing relationship. Comparison of the results from the model with spatial measures of fishing effort based on satellite vessel monitoring data suggests that increasing exploitation may be masking the relationships as scallop beds are targeted and fished down. These results could have implications on the interpretation of species habitat associations from areas where data are only available from periods when the populations have been exploited over a long time. In these cases, the spatial distribution of fishing effort may be a better indicator of species habitat associations than the estimates from surveys.