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Structural analysis of the meiobenthos communities of the shelf break area in two stations of the Gulf of Biscay (N.E. Atlantic)
Vanreusel, A.; Vincx, M.; Van Gansbeke, D.; Gijselinck, W. (1992). Structural analysis of the meiobenthos communities of the shelf break area in two stations of the Gulf of Biscay (N.E. Atlantic). Belg. J. Zool. 122(2): 185-202
In: Belgian Journal of Zoology. Koninklijke Belgische Vereniging voor Dierkunde = Société royale zoologique de Belgique: Gent. ISSN 0777-6276; e-ISSN 2295-0451
Peer reviewed article  

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Keywords
    Abundance; Biomass; Deep sea; Ecology; Meiobenthos; Nematoda [WoRMS]; ASW, Puerto Rico Trench [Marine Regions]; Marine
Author keywords
    Shelf break

Authors  Top 
  • Vanreusel, A., more
  • Vincx, M., more
  • Van Gansbeke, D.
  • Gijselinck, W.

Abstract
    In a first attempt to obtain information in order to characterize the shelf break zone, the meiobenthos communities of two fine sandy stations of 190 m and 325 m depth in the Gulf of Biscay off the Spanish coast were investigated in relation to some environmental characteristics (sediment composition, chlorophyll a content, redox values). The nematodes, which are the dominant taxon, were studied in detail. Their communities are relatively poor in densities (840 and 779 individuals per 10cm2 and biomass (0.137 and 0.334mg dwt/10cm2) compared to those of shallow coastal areas. The dominance of small species (mean individual biomass: 0.169 and 0.423 µg dwt) and a low total biomass can be related to the low chlorophyll a content (maximum of 1.14 µg/g). However, the number of nematode genera is much higher (46 and 62 genera per station) than on the continental shelves (often less than 40 species per 10 cm2). Sabatieria, Daptonema, Minolaimus, Richtersia and Halalaimus are the dominant genera in the two stations. These are also characteristic genera for the abyssal zone. The composition of the nematode communities is more similar to deep-sea communities than to those from subtidal zones. The low food supply is considered as an important structuring factor.

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