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The number of niches in intestinal helminth communities of Anguilla anguilla: are there enough spaces for parasites?

Published online by Cambridge University Press:  06 April 2009

C. R. Kennedy  and
J.-F. Guégan
C. R. Kennedy*
Affiliation:
Department of Biological Sciences, University of Exeter, Exeter EX4 4PS, UK
J.-F. Guégan
Affiliation:
ORSTOM, B.P. 165, 97323 Cayenne cedex, Guyane, France
*
* Corresponding author. Tel: 01392 263757. Fax: 01392 263700. E-mail: [email protected].
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Summary

The suggestion that there may be a limit to the number of niches available to helminth species in the intestine of Anguilla anguilla was investigated by examining the frequency distributions of the number of helminth species per eel and the relationships between maximum and mean infracommunity richness and component community richness in 1 locality over 17 years and in 64 localities throughout Ireland and England. The maximum number of species per eel did not exceed 4 in the 1 locality, or 3 in the 64 localities. In both the single and the several localities, the relationship between maximum and mean infracommunity richness and component community richness was curvilinear and best described by a power or polynomial function. This was interpreted to mean that infracommunity richness became increasingly independent of component community richness, and that infracommunities were saturated at values well below the higher level of helminth richness immediately available for colonization i.e. component community richness. It is argued that these findings cannot be explained by supply-side ecology, pool exhaustion or transmission rates, but only by infracommunity processes acting to impose a fixed limit to the number of species in an infracommunity. Most infracommunities are species poor, and the limiting factors will only operate as species richness rises to determine a maximum. Acceptance of a limit to the number of niches available also resolves the apparent inconsistency between the occurrence and importance of interspecific competition and the nature of isolationist communities.

Keywords

fishhelminth communitynichecompetitionspecies richnesstemporal seriesspatial series
Type
Research Article
Information
Parasitology , Volume 113 , Issue 3 , September 1996 , pp. 293 - 302
Copyright
Copyright © Cambridge University Press 1996

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