GEOSCAN, résultats de la recherche


TitreAssociations of lobsters (Homarus americanus) off southwestern Nova Scotia with bottom type from images and geophysical maps
AuteurTremblay, M J; Smith, S J; Todd, B J; Clement, P M; McKeown, D L
SourceICES journal of marine science vol. 66, no. 9, 2009 p. 2060-2067, (Accès ouvert)
Séries alt.Secteur des sciences de la Terre, Contribution externe 20080223
ÉditeurOxford University Press (OUP)
RéunionICES Annual Science Conference; Halifax, NS; CA; Septembre 22-26, 2008
Documentpublication en série
Mediapapier; en ligne; numérique
ProvinceRégion extracotière de l'est
Lat/Long OENS-66.4167 -65.5000 43.6667 43.1667
Sujetstopographie du fond océanique; topographie du fond océanique; faunes; etudes fauniques; distribution de la faune; assemblages fauniques; peuplements biologiques; biomes; diversification biotique; écosystèmes; organismes marins; milieux marins; bathymétrie; géologie marine; géologie de l'environnement
Illustrationslocation maps; histograms; tables
ProgrammeLes géosciences à l'appui de la gestion des océans
Diffusé2009 06 25
Résumé(disponible en anglais seulement)
Images from an underwater towed vehicle (Towcam) were used to estimate densities and to evaluate bottom-type associations of lobsters (Homarus americanus), crabs (Cancer spp.), and scallops (Placopecten magellanicus). Images were obtained in October 2006 along 14 line-transects off southwestern Nova Scotia in an area with productive lobster and scallop fisheries. Lobsters were observed in 4% of the 2044 images, crabs in 7%, and scallops in 40%. On sand, gravel, and cobble seabed, lobsters were readily observable. On rougher substrata with boulders, some lobsters were still evident either in the open or partially hidden in shelters. Estimated densities of lobsters from the images on some transects were 0.04 m22, approximately half of the estimates of lobster density for adjacent inshore areas from scuba, but 34 times higher than estimates from scallop drags in the same area. Models of animal presence by bottom type were evaluated with categories that were (i) geophysically based (map of bottom type from geophysical characteristics) and (ii) image-based (sediment size from images). Significant relationships were evident with both types of seabed categorization, suggesting that it would be beneficial to stratify surveys using geophysical categories. Depth was also significant in determining presence/absence of lobsters and crabs. There is potential to develop indicators of lobster abundance using underwater imaging, and stratification by bottom type should be incorporated into surveys.