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TitreAncient deep-sea sponge grounds on the Flemish Cap and Grand Bank, northwest Atlantic
AuteurMurillo, F J; Kenchington, E; Lawson, J M; Li, G; Piper, D J W
SourceMarine Biology vol. 163, issue 3, 63, 2016 p. 1-11, https://doi.org/10.1007/s00227-016-2839-5 (Accès ouvert)
Année2016
Séries alt.Secteur des sciences de la Terre, Contribution externe 20150410
ÉditeurSpringer Nature
Documentpublication en série
Lang.anglais
DOIhttps://doi.org/10.1007/s00227-016-2839-5
Mediapapier; en ligne; numérique
Formatspdf; html
ProvinceRégion extracotière de l'est
Lat/Long OENS -52.0000 -43.0000 49.0000 42.0000
Sujetscarottes prélevée en eau profonde; carottes; carottes de sédiment marin; déglaciation; biostratigraphie; glaciation; lithostratigraphie; datations au radiocarbone; Éponges; géologie marine; stratigraphie; géochronologie; Quaternaire
Illustrationsgeological sketch maps; photographs
ProgrammeLa géoscience pour les développements extracôtiers de la côte est, Géoscience en mer
Diffusé2016 02 29
Résumé(disponible en anglais seulement)
Recent studies on deep-sea sponges have focused on mapping contemporary distributions while little work has been done to map historical distributions; historical distributions can provide valuable information on the time-frame over which species have co-evolved and may provide insight into the reasons for their persistence or decline. Members of the sponge family Geodiidae are dominant members of deep-sea sponge assemblages in the northwestern Atlantic. They possess unique spicules called sterrasters, which undergo little transport in sediment and can therefore indicate Geodiidae sponge historical presence when found in sediment cores. This study focuses on the slopes of Flemish Cap and Grand Bank, important fishing grounds off the coast of Newfoundland, Canada, in international waters. Sediment cores collected in 2009 and 2010 were visually inspected for sponge spicules. Cores containing spicules were sub-sampled and examined under a light microscope for the presence of sterrasters. These cores were also dated using X-radiographs and grouped into five time categories based on known sediment horizons, ranging from 17,000 years BP to the present. Chronological groupings identified Geodiidae sponges in four persistent sponge grounds. The oldest sterrasters were concentrated in the eastern region of the Flemish Cap and on the southeastern slope of the Grand Bank. Opportunistic sampling of a long core in the southeastern region of the Flemish Cap showed continuous presence of sponge spicules to more than 130 ka BP. Our results indicate that the geodiids underwent a significant range expansion following deglaciation, and support a contemporary distribution that is not shaped by recent fishing activity
Résumé(Résumé en langage clair et simple, non publié)
La comparaison de la répartition actuelle des éponges marines (un écosystème marin potentiellement vulnérable) avec les répartitions au cours de la dernière glaciation indique que l'aire de répartition s'est considérablement étendue pendant la déglaciation. Les activités récentes de pêche n'ont pas influé nettement sur la répartition.
GEOSCAN ID297532