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Long-term investigation of the composition and richness of intestinal helminth communities in the stocked population of eel, Anguilla anguilla, in Neusiedler See, Austria

Published online by Cambridge University Press:  12 November 2004

M. SCHABUSS
Affiliation:
Institute of Ecology and Conservation Biology, University of Vienna, Althanstrasse 14, A-1090 Vienna, Austria Aquatic Ecotoxicology, Department of Natural Sciences, University of Veterinary Medicine, Vienna, Veterinärplatz 1, A-1210 Vienna, Austria
C. R. KENNEDY
Affiliation:
Department of Biological Sciences, University of Exeter, Exeter EX4 4PS, UK
R. KONECNY
Affiliation:
Institute of Ecology and Conservation Biology, University of Vienna, Althanstrasse 14, A-1090 Vienna, Austria Umweltbundesamt, Spittelauer Lände 5, 1090 Vienna, Austria
B. GRILLITSCH
Affiliation:
Aquatic Ecotoxicology, Department of Natural Sciences, University of Veterinary Medicine, Vienna, Veterinärplatz 1, A-1210 Vienna, Austria
F. SCHIEMER
Affiliation:
Institute of Ecology and Conservation Biology, University of Vienna, Althanstrasse 14, A-1090 Vienna, Austria
A. HERZIG
Affiliation:
Biological Station Illmitz, A-7142 Illmitz, Austria

Abstract

Data from a long-term study of the intestinal helminth parasite community of eels, Anguilla anguilla, stocked into the shallow eutrophic Neusiedler See, Austria, were collected over an 8 year period (1994–2001). In total, 720 eels from 2 sampling sites were examined. The parasite community showed characteristics similar to those in the natural eel populations in rivers of the UK and mainland Europe: it was species poor, with only 5 species (Acanthocephalus lucii, Acanthocephalus anguillae, Raphidascaris acus, Proteocephalus macrocephalus, Bothriocephalus claviceps) comprising the component community and a maximum infracommunity richness of 4 species. Over the period, the intestinal parasite community of the sampling site in Illmitz, which was originally dominated by A. lucii, changed. As levels of A. anguillae increased to a point at which it dominated the community, diversity increased whilst dominance of a single species decreased. By contrast the community in the southern sampling site remained rather constant with a continuous high infection level of A. anguillae and low abundance of A. lucii. Both acanthocephalan species exhibited higher infection levels in larger eels and in different seasons of the year and the infection parameters were significantly different between the years of study. The significant differences in the infection levels of the 2 acanthocephalan species at the 2 sampling sites were surprising as both acanthocephalan species use the same intermediate host, Asellus aquaticus, and the sampling sites were in close proximity and were similar in terms of water quality, host size and invertebrate abundance. Differences in the fish communities of the 2 sampling sites and eel movements rather than interspecific competition are discussed as possible explanations for the differences in the parasite communities of the 2 sampling sites.

Type
Research Article
Copyright
© 2005 Cambridge University Press

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