Document of bibliographic reference 208925

BibliographicReference record

Type

Bibliographic resource

Type of document

Journal article

BibLvlCode

AS

Title

Environmental setting of deep-water oysters in the Bay of Biscay

Abstract

We report the northernmost and deepest known occurrence of deep-water pycnodontine oysters, based on two surveys along the French Atlantic continental margin to the La Chapelle continental slope (2006) and the Guilvinec Canyon (2008). The combined use of multibeam bathymetry, seismic profiling, CTD casts and a remotely operated vehicle (ROV) made it possible to describe the physical habitat and to assess the oceanographic control for the recently described species Neopycnodonte zibrowii. These oysters have been observed in vivo in depths from 540 to 846 m, colonizing overhanging banks or escarpments protruding from steep canyon flanks. Especially in the Bay of Biscay, such physical habitats may only be observed within canyons, where they are created by both long-term turbiditic and contouritic processes. Frequent observations of sand ripples on the seabed indicate the presence of a steady, but enhanced bottom current of about 40 cm/s. The occurrence of oysters also coincides with the interface between the Eastern North Atlantic Water and the Mediterranean Outflow Water. A combination of this water mass mixing, internal tide generation and a strong primary surface productivity may generate an enhanced nutrient flux, which is funnelled through the canyon. When the ideal environmental conditions are met, up to 100 individuals per m² may be observed. These deep-water oysters require a vertical habitat, which is often incompatible with the requirements of other sessile organisms, and are only sparsely distributed along the continental margins. The discovery of these giant oyster banks illustrates the rich biodiversity of deep-sea canyons and their underestimation as true ecosystem hotspots.

WebOfScience code

https://www.webofscience.com/wos/woscc/full-record/WOS:000285432100004

Bibliographic citation

Van Rooij, D.; De Mol, L.; Le Guilloux, E.; Wisshak, M.; Huvenne, V.A.I.; Moeremans, R.; Henriet, J.-P. (2010). Environmental setting of deep-water oysters in the Bay of Biscay. Deep-Sea Res., Part 1, Oceanogr. Res. Pap. 57(12): 1561-1572. dx.doi.org/10.1016/j.dsr.2010.09.002

Topic

Marine

Is peer reviewed

true