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Growth and branching patterns of Lophelia pertusa (Scleractinia) from the North Sea

Published online by Cambridge University Press:  02 June 2010

S.E. Gass  and
J.M. Roberts
S.E. Gass*
Affiliation:
Scottish Association for Marine Science, Dunstaffnage Marine Laboratory, Oban, Argyll, ScotlandPA37 1QA
J.M. Roberts
Affiliation:
Scottish Association for Marine Science, Dunstaffnage Marine Laboratory, Oban, Argyll, ScotlandPA37 1QA
*
Correspondence should be addressed to: S.E. Gass, Dalhousie University, Environmental Programs, Halifax, Nova Scotia, Canada, B3H 4J1 email: susan.gass@dal.ca
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Abstract

Lophelia pertusa, a cosmopolitan cold-water coral, offers potential for new palaeoclimate proxies. This study investigated its skeletal growth patterns to aid in this development. Corallite characteristics (calyx diameter, height, thecal width and banding) of L. pertusa sampled from oil platforms in the northern North Sea were examined. The mean distance between daughter polyps along a growth axis (27.4 ± 5 mm, SD) was equivalent to the estimated annual growth rate; hence, the polyps bud once a year. The majority of growth occurred in the first year when the characteristic trumpet shape of a corallite was formed, while the thecal wall thickened more consistently. Further examination of two polyps showed a dark growth band and centres of calcification along the full length of the inner theca, which represents early skeletal growth. Skeletal sampling adjacent to this area along sequential polyps shows promise as an annual chronology in these North Sea corals.

Keywords

cold-water coraldeep-sea coralpalaeo-oceanographycoral growth
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 91 , Issue 4 , June 2011 , pp. 831 - 835
Copyright
Copyright © Marine Biological Association of the United Kingdom 2010

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