Sponge associations in the eastern Weddell Sea

Barthel, Dagmar and Gutt, Julian (1992) Sponge associations in the eastern Weddell Sea Antarctic Science, 4 (02). pp. 137-150. DOI 10.1017/S0954102092000221.

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About 1500 photographs from three different areas along the eastern Weddell Sea shelf and slope were analysed with respect to their sponge fauna. On the basis of material collected in concurrent bottom trawls, 34 sponge taxa were identified. Cluster and multidimensional scaling analysis showed the sponges to belong to different associations. Spatial extension of the associations is judged to be between several hundred meters and about 2 km. A deeper association (390–1125 m) on predominantly muddy substrates along a transect at Halley Bay is characterized by four opportunistic demosponge species; a second association on harder substrate in shallower depths (99–225m) off Kapp Norvegia is more diverse, with hexactinellids as one dominant component. A third cluster, comprising both Halley Bay and Kapp Norvegia stations (458–626 m), is dominated by four species which constitute a subcluster within the Kapp Norvegia sponge association. Densities vary strongly within clusters and in between geographically close stations. The species associations are related to different substrates, not to depth. Within single stations most species are patchily distributed. Both association structure and species distribution within single stations can be explained on the basis of the biology of the single sponge species.

Document Type: Article
Keywords: Antarctica, demosponges, hexactinellids, sponge association, underwater photography
Research affiliation: AWI
OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EOE-B Experimental Ecology - Benthic Ecology
Refereed: Yes
DOI etc.: 10.1017/S0954102092000221
ISSN: 0954-1020
Date Deposited: 01 Mar 2018 08:26
Last Modified: 01 Mar 2018 08:26
URI: http://eprints.uni-kiel.de/id/eprint/42059

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