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Populations of Acanthocephalus anguillae and Pomphorhynchus laevis in rivers with different pollution levels

Published online by Cambridge University Press:  05 June 2009

P. Galli ,
L. Mariniello ,
G. Crosa ,
M. Ortis ,
A. Occhipinti Ambrogi  and
S. D'Amelio
P. Galli*
Affiliation:
Dipartimento di Scienze dell' Ambiente e del Territorio, Università degli Studi di Milano, Via Emanueli 15, 20126, Milan, Italy
L. Mariniello
Affiliation:
Istituto di Parassitologia, Università di Roma “La Sapienza”, P. le Aldo Moro, 5, 00185, Rome, Italy
G. Crosa
Affiliation:
Dipartimento di Scienze dell' Ambiente e del Territorio, Università degli Studi di Milano, Via Emanueli 15, 20126, Milan, Italy
M. Ortis
Affiliation:
Istituto di Parassitologia, Università di Roma “La Sapienza”, P. le Aldo Moro, 5, 00185, Rome, Italy
A. Occhipinti Ambrogi
Affiliation:
Dipartimento di Scienze dell' Ambiente e del Territorio, Università degli Studi di Milano, Via Emanueli 15, 20126, Milan, Italy
S. D'Amelio
Affiliation:
Istituto di Parassitologia, Università di Roma “La Sapienza”, P. le Aldo Moro, 5, 00185, Rome, Italy
*
*Fax: +39 2 64474 200 E-mail: paolog@alpha.disat.unimi.it
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Abstract

The distribution of two acanthocephalan species (Pomphorhynchus laevis and Acanthocephalus anguillae) in the chub (Leuciscus cephalus) was studied in foriver reaches characterized by different levels of pollution: the River Ticino ne Abbiategrasso (unpolluted), the Naviglio Grande Canal, in Milano (slightly polluted), the River Lambro near Merone village (polluted) and the Riv Lambro near Monza (severely polluted).

Pomphorhynchus laevis was restricted to the unpolluted and the slight polluted sites, while the intensity of A. anguillae increased proportionally water pollution. These differences were partially explained by the variation in abundance of their intermediate hosts (Echinogammarus stammeri for P. lavis and Asellus aquaticus for A. anguillae). Data on the occurrence of P. laevis at A. anguillae showed a significant negative binomial frequency distributic suggesting their tendency to be aggregated within the host populations L. cephalus.

Type
Research Papers
Information
Journal of Helminthology , Volume 72 , Issue 4 , December 1998 , pp. 331 - 335
Copyright
Copyright © Cambridge University Press 1998

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