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Temperature induced disease in the starfish Astropecten jonstoni

Published online by Cambridge University Press:  16 April 2009

Annette Staehli*
Affiliation:
Zoological Museum, University of Zurich, Winterthurerstr. 190, 8057 Zurich, Switzerland
Rolf Schaerer
Affiliation:
ISME St Gallen, Bruehlgasse 18, 9004 St.Gallen, Switzerland
Katharina Hoelzle
Affiliation:
Institute of Veterinary Bacteriology, University of Zurich, Winterthurerstr. 270, 8057 Zurich, Switzerland
Georg Ribi
Affiliation:
Zoological Museum, University of Zurich, Winterthurerstr. 190, 8057 Zurich, Switzerland
*
Correspondence should be addressed to: Annette Staehli, Zoological Museum, University of Zurich, Winterthurerstr. 190, 8057 Zurich, Switzerland email: annettestaehli@access.unizh.ch
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Abstract

In recent years there has been an increasing interest in the effects of water temperature changes on the structure of marine populations. During the 1970s the burrowing starfish Astropecten jonston was present in large numbers along the south-east of Sardinia (Italy). When investigations were resumed in 1999 fewer active individuals could be found than in the 1970s, with anecdotal evidence suggesting an increase in sightings of dying animals on the sand surface. These observations, combined with a hitherto unknown susceptibility to handling stress, caused us to investigate the effect of water temperature, salinity and individual size on A. jonstoni survival. Results indicated that significantly fewer starfish were affected by a wasting disease when kept at 12°C compared with individuals maintained at 20°C and 25°C regardless of salinity (28 or 35 ppt) and that smaller starfish were less affected. Microbiological analysis revealed that, amongst other species, bacteria of the genus Vibrio, which have been associated with diseases of stressed marine invertebrates, were present in both field and laboratory animals.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 2009

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