Impact of large-scale natural physical disturbance on the diversity of deep-sea North Atlantic nematodes

Autor:	Pjd Lambshead, Adrian G. Glover, David Thistle, John Tietjen, Andrew J. Gooday, Timothy J. Ferrero
Rok vydání:	2001
Předmět:	geography geography.geographical_feature_category Ecology Abyssal plain Species diversity Aquatic Science Structural basin Deep sea Turbidite Abyssal zone Oceanography Benthic zone Alpha diversity Ecology Evolution Behavior and Systematics Geology
Zdroj:	Marine Ecology Progress Series. 214:121-126
ISSN:	1616-1599 0171-8630
DOI:	10.3354/meps214121
Popis:	Nematode alpha diversity from 3 physically disturbed sites in the deep North Atlantic was compared with reference sites. Nematode diversity at the HEBBLE benthic storm site was statis- tically, and significantly, lower than at reference sites. Nematode diversity at the Madeira Abyssal Plain site, which was subject to a turbidite dated at 930 BP, also showed a significantly lower diver- sity than reference sites. However, limited data suggest that diversity was not low at a Venezuela Basin turbidite site. The difference in nematode diversity between the 2 turbidite sites is ascribed to a long term change in sediment conditions at the Madeira site. The Venezuela Basin turbidite site has a sedimentation rate greater than the Maderia site by 1 to 2 orders of magnitude, and this was reflected in the sediment profiles. Another possibility is that the Venezuela Basin turbidite is consid- erably older, by at least 1000 yr, than the Madeira turbidite, allowing more time for recolonisation. The data suggest that deep-sea nematode diversity may be affected by physical disturbance but that deep-sea nematodes, like their shallow counterparts, are more robust than macrofauna such as poly- chaetes to such impacts.
Databáze:	OpenAIRE
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