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Regional comparisons of Codium (Chlorophyta) assemblages in the northern versus southern English Channel

Published online by Cambridge University Press:  02 April 2009

Cynthia D. Trowbridge  and
William F. Farnham
Cynthia D. Trowbridge*
Affiliation:
Department of Zoology, Oregon State University, PO Box 1995, Newport, OR 97365, USA
William F. Farnham
Affiliation:
Institute of Marine Sciences, University of Portsmouth, Eastney, Portsmouth PO4 9LY, UK
*
Correspondence should be addressed to: C.D. Trowbridge, Department of Zoology, Oregon State University, PO Box 1995, Newport, OR 97365, USA email: trowbric@yahoo.com
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Abstract

The cryptic invasion of the Asian macroalga Codium fragile (Suringar) Hariot ssp. fragile on north-eastern Atlantic shores has been long considered a classical example of a successful invader that has competitively displaced native congeners. Yet, the lack of quantitative information about morphologically similar native congeners, namely Codium tomentosum Stackhouse and C. vermilara (Olivi) Delle Chiaje, has hindered interspecific comparisons and ecological predictions. From September 2002 to 2005, we made extensive intertidal surveys on 12 northern and 26 southern rocky shores of the English Channel, specifically documenting the abundance, distribution and identity of Codium assemblages. On the north side of the English Channel, the native C. tomentosum and alien C. fragile were both sparsely distributed in intertidal pools in Devon. In contrast, the natives were absent from and the alien was locally abundant in shallow lagoons and rocky reefs around Bembridge and Whitecliff on the Isle of Wight. Finally, in the Channel Islands off the Atlantic coast of France, Codium spp. were abundant in pools and on low-shore emergent substrata with native species predominating. Patterns of distribution varied substantially among Guernsey, Jersey and Alderney, despite their close proximity. The regional variation in the algal distributions merits further investigation to determine whether the pattern is produced by: (1) anthropogenic activities and effects; (2) ecological interactions; (3) oceanographic factors; or (4) some combination of these.

Keywords

Codiumnon-indigenous speciesnative speciesnorth-eastern AtlanticEnglish Channel
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 89 , Issue 2 , March 2009 , pp. 255 - 263
Copyright
Copyright © Marine Biological Association of the United Kingdom 2009

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