GEOSCAN, résultats de la recherche


TitreAnalysis of epi-benthos distribution and their possible association to Gary Knoll's pingo-like-features on the Canadian Beaufort Shelf: a small-scale case study
AuteurJerosch, K; Kostylev, V E; Blasco, S M
SourceGeographic Technologies applied to Marine Spatial Planning and Integrated Coastal Zone Management; par Calado, H (éd.); Gil, A; 2010 p. 78-85
Séries alt.Secteur des sciences de la Terre, Contribution externe 20100299
ProvinceRégion extracotière du nord
Lat/Long OENS-140.0000 -130.0000 71.2500 69.0000
Sujetsstructures sédimentaires; pingos; bathymétrie; benthos; milieux marins; biote; hydrocarbures; hydrate; gaz; topographie du fond océanique; topographie du fond océanique; géologie marine; combustibles fossiles
Illustrationslocation maps; cross-sections
ProgrammeGéoscience en mer, Gestionnaire de programme
Résumé(disponible en anglais seulement)
The study focuses on a unique geologic environment throughout the Canadian Beaufort Shelf and its likely role as a unique arctic habitat. Pingolike- features (PLFs) are bathymetric features formed by gas-driven sediments derived from decomposing gas-hydrate associated with Holocene sea level rise. They are unique habitats arising more than 15m off the seafloor, with a small diameter of about 80-90m. Based on multibeam data and video analysis this paper details the distribution of epibenthos living on top of the PLFs and in the vicinity surrounding two PLFs. We, attribute to the PLFs a role as a distinct habitat in the Beaufort Sea. We found a considerably higher number of species at or near PLFs than at the reference station at a distance of several hundreds. Furthermore, we located more sessile species on the shallower and wider PLF which possibly indicates less activity and age than the steeper and higher PLF's.