GEOSCAN, résultats de la recherche


TitreSeabed habitats of the German Bank glaciated shelf, Atlantic Canada
AuteurTodd, B J; Smith, S J; Kostylev, V E
SourceGeoHab 2010, characterisation, quantification and diversity of extreme habitats, conference handbook, programme & abstracts; par Lamarche, G (éd.); 2010 p. 145
LiensOnline - En ligne
Séries alt.Secteur des sciences de la Terre, Contribution externe 20090412
RéunionGeoHab 10th International Conference; Wellington; NZ; mai 4-7, 2010
Mediapapier; en ligne; numérique
ProvinceRégion extracotière de l'est
Sujetsorganismes marins; écosystèmes; topographie du fond océanique; topographie du fond océanique; peuplements biologiques; géologie marine
ProgrammeGéoscience en mer, Énergie renouvelable offshore
Résumé(disponible en anglais seulement)
An area of 5320 km2 in water depths of 30 to 250 m has been mapped on German Bank on the southern Scotian Shelf in Atlantic Canada. The Scotian Shelf is a formerly glaciated continental margin characterized by a topographically rugged inner shelf. Bedrock is exposed at the seafloor on much of German Bank. Ice-contact sediment (till) was deposited beneath or at the margins of the ice sheet directly onto bedrock during the Wisconsinan glaciation and occurs as a widespread sediment blanket. Ice-distal glaciomarine silt overlies the older till and is primarily confined to small basins on the bank. Limited accumulations of postglacial sediments are composed of well-sorted sand, grading to rounded and subrounded gravel. Statistical analyses of benthic community structure based on seabed photographs show no difference in observed fauna between different seabed types. However, analyses of vessel monitoring systems indicate that the commercial scallop fishery occurs on ice-contact and postglacial sediment.