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First record of Bedotella armata (Cnidaria: Hydrozoa) from the Porcupine Seabight: do north-east Atlantic carbonate mound fauna have Mediterranean ancestors?

Published online by Cambridge University Press:  11 February 2009

Lea-Anne Henry  and
J. Murray Roberts
Lea-Anne Henry*
Affiliation:
Scottish Association for Marine Science, Oban, Argyll, United Kingdom
J. Murray Roberts
Affiliation:
Scottish Association for Marine Science, Oban, Argyll, United Kingdom
*
Correspondence should be addressed to: Lea-Anne Henry, Scottish Association for Marine Science, Oban, Argyll, United Kingdom email: leaanne.roberts@gmail.com
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Abstract

We report the first record of the hydroid Bedotella armata (Pictet & Bedot, 1900) from a bathyal region of the Porcupine Seabight, southwest Ireland. Bedotella armata was thought to be endemic to the southern Lusitanian province and the Mediterranean.Yet specimens were common in box cores on and off living coral mounds formed by the scleractinian Lophelia pertusa. Irish colonies were slightly larger than those from the Strait of Gibraltar and the Bay of Biscay.We hypothesize that the association of B. armata with L. pertusa could explain morphological differences, as hydroids on reef structures may benefit from better feeding opportunities in enhanced flow conditions. We also hypothesize that post-glacial hydroid colonization of these mounds during the Holocene was partly due to species emigration from the warm saline Mediterranean Outflow Water (MOW) mass. Our findings support the hypothesis that MOW could play a significant role in determining the distribution and recent origins of mound fauna in the Porcupine Seabight.The current findings become the deepest, northernmost record of B. armata.

Keywords

Bedotella armataHydrozoaPorcupine SeabightSW Irelandnorthernmost record
Type
Research Article
Information
Marine Biodiversity Records , Volume 1 , January 2008 , e24
Copyright
Copyright © Marine Biological Association of the United Kingdom 2006

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