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Recent expansion of the slipper limpet population (Crepidula fornicata) in the Bay of Mont-Saint-Michel (Western Channel, France)

Published online by Cambridge University Press:  08 April 2009

Michel Blanchard
Michel Blanchard*
Affiliation:
IFREMER, Dép. Dynamiques de l'Environnement Côtier (DYNECO), BP 70, 29280 Plouzané, France
*
[email protected]
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Abstract

A population of the invasive slipper limpet (Crepidula fornicata) has been spreading in the Bay of Mont-Saint-Michel (Western English Channel) for 40 years. Sidescan sonar, underwater video and quantitative sampling were conducted in 1996 and 2004 to document the widening geographic spread of the species over the bay. The limpet population grew by 50% during this period, to reach a fresh biomass of about 150 000 t. This local study analyses causes and effects of the spread and provides a typical example of the limpet spreading process. This population increase has significant effects on the environment in the most densely colonized area (modification to the sediment and biodiversity), leading to the emergence of a new benthic community. Anthropic dredging activities are among the causative factors of the spread but are also adversely affected by the invasion.

Keywords

Invasive speciesSpreadOyster-farmingStock estimationSidescan sonarCrepidula fornicataWestern Channel, France
Type
Research Article
Information
Aquatic Living Resources , Volume 22 , Issue 1 , January 2009 , pp. 11 - 19
Copyright
© EDP Sciences, IFREMER, IRD, 2009

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