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Regulation of Anguillicola crassus (Nematoda) infrapopulations in their definitive host, the European eel, Anguilla anguilla

Published online by Cambridge University Press:  22 October 2008

G. FAZIO ,
P. SASAL ,
C. DA SILVA ,
B. FUMET ,
J. BOISSIER ,
R. LECOMTE-FINIGER  and
H. MONÉ
G. FAZIO*
Affiliation:
Laboratoire de Biologie et d'Écologie Tropicale et Méditerranéenne, UMR 5244 CNRS-EPHE-UPVD, Université de Perpignan, 52 avenue Paul Alduy, 66860 Perpignan Cedex, France
P. SASAL
Affiliation:
Laboratoire de Biologie et d'Écologie Tropicale et Méditerranéenne, UMR 5244 CNRS-EPHE-UPVD, Université de Perpignan, 52 avenue Paul Alduy, 66860 Perpignan Cedex, France
C. DA SILVA
Affiliation:
Laboratoire de Biologie et d'Écologie Tropicale et Méditerranéenne, UMR 5244 CNRS-EPHE-UPVD, Université de Perpignan, 52 avenue Paul Alduy, 66860 Perpignan Cedex, France
B. FUMET
Affiliation:
Laboratoire de Biologie et d'Écologie Tropicale et Méditerranéenne, UMR 5244 CNRS-EPHE-UPVD, Université de Perpignan, 52 avenue Paul Alduy, 66860 Perpignan Cedex, France
J. BOISSIER
Affiliation:
Laboratoire de Biologie et d'Écologie Tropicale et Méditerranéenne, UMR 5244 CNRS-EPHE-UPVD, Université de Perpignan, 52 avenue Paul Alduy, 66860 Perpignan Cedex, France
R. LECOMTE-FINIGER
Affiliation:
Laboratoire de Biologie et d'Écologie Tropicale et Méditerranéenne, UMR 5244 CNRS-EPHE-UPVD, Université de Perpignan, 52 avenue Paul Alduy, 66860 Perpignan Cedex, France
H. MONÉ
Affiliation:
Laboratoire de Biologie et d'Écologie Tropicale et Méditerranéenne, UMR 5244 CNRS-EPHE-UPVD, Université de Perpignan, 52 avenue Paul Alduy, 66860 Perpignan Cedex, France
*
*Corresponding author: Tel: +33 (0) 4 68 66 20 50. Fax: +33 (0) 4 68 66 22 81. E-mail: fazio@univ-perp.fr
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Summary

The parasitic nematode Anguillicola crassus was recently introduced into populations of the European eel, Anguilla anguilla. We investigated, under experimental conditions, the regulation of A. crassus infrapopulations. We tested the effects of (1) the resource-limited habitat of the parasite and (2) the coexistence of several developmental stages in its niche (the swim-bladder) on the composition of the infrapopulations. The results revealed that the respective effects of these factors differed substantially during the course of the infection. Third-stage larvae (L3s) establishment would not be constrained by the size of the swim-bladder. Their moult to fourth-stage larvae (L4s) would be accelerated as the number of L3s increased. The moulting time of L4s to adults would be reduced by males and would be constrained by the size of the swim-bladder. However, the moult of L4s to adults and their further development would be synchronized with those of the opposite sex. At the time of mating, the number of males and the body weight of adults would depend on the size of the swim-bladder. Soon after the laying of eggs, the developmental constraint on the late L3s would decrease. When adults die, constraints would cease and late larval stages would moult to become adults.

Keywords

nematode parasitesinfrapopulationregulationnicheintra-specific competitionAnguillicola crassusAnguilla anguilla
Type
Research Article
Information
Parasitology , Volume 135 , Issue 14 , December 2008 , pp. 1707 - 1716
Copyright
Copyright © 2008 Cambridge University Press

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