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Distribution and abundance of teredinid recruits along the Swedish coast – are shipworms invading the Baltic Sea?

Published online by Cambridge University Press:  15 December 2014

Christin Appelqvist*
Affiliation:
Department of Biological and Environmental Sciences, University of Gothenburg, Tjärnö SE-452 96Strömstad, Sweden
Jon N. Havenhand
Affiliation:
Department of Biological and Environmental Sciences, University of Gothenburg, Tjärnö SE-452 96Strömstad, Sweden
Gunilla B. Toth
Affiliation:
Department of Biological and Environmental Sciences, University of Gothenburg, Tjärnö SE-452 96Strömstad, Sweden
*
Correspondence should be addressed to: C. Appelqvist, Department of Biological and Environmental Sciences, University of Gothenburg, Tjärnö, SE-452 96 Strömstad, Sweden email: christin.appelqvist@gu.se

Abstract

Shipworms (teredinids) are highly specialized marine bivalves that consume terrestrially derived wood. Changes in environmental variables may result in shipworms spreading into the Baltic Sea – which would have devastating consequences for maritime cultural heritage and submerged wooden structures. We investigated the distribution and abundance of the shipworms Teredo navalis and Psiloteredo megotara along the Swedish coast in 2006–2008, and compared our findings with data collected at partly the same locations in 1971–1973. Wooden test panels were submerged in near-surface waters at 18 harbours. The presence of shipworms was determined by X-ray radiography of each panel. Sea surface temperature and salinity data were analysed to investigate whether any changes in distribution were correlated to changes in environmental variables. We found that past and present distributions of T. navalis were similar – indicating that no range expansion of shipworms into the Baltic Sea has taken place the last 35 years. The abundance of T. navalis was similar between decades at all investigated sites except two (Arild and Barsebäckshamn), where abundances were higher in 2006–2008. The abundance of T. navalis varied along the coast and was positively correlated to mean sea surface salinity, but not to mean sea surface temperature (2006–2008 data). The distribution and abundance of P. megotara were similar during the two study periods with only single observations at a few sites. In conclusion, we found no evidence of range expansion of shipworms along the Swedish coast.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 2014 

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