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Genetic and morphological variation in Echinorhynchus gadi Zoega in Müller, 1776 (Acanthocephala: Echinorhynchidae) from Atlantic cod Gadus morhua L.

Published online by Cambridge University Press:  25 January 2011

E. Sobecka ,
B. Szostakowska ,
K. MacKenzie ,
W. Hemmingsen ,
S. Prajsnar  and
M. Eydal
E. Sobecka*
Affiliation:
Department of Fish Diseases, West Pomeranian University of Technology in Szczecin, Poland
B. Szostakowska
Affiliation:
Department of Tropical Parasitology, Medical University of Gdansk, Inter-Faculty Institute of Maritime and Tropical Medicine, Poland
K. MacKenzie
Affiliation:
School of Biological Sciences (Zoology), The University of Aberdeen, Aberdeen, UK
W. Hemmingsen
Affiliation:
Institute of Biology, Department of Ecology and Department of Zoology, University of Tromsø, Norway
S. Prajsnar
Affiliation:
The Deep, Hull Sealife Centre, Tower Street, Hull, UK
M. Eydal
Affiliation:
Institute for Experimental Pathology, University of Iceland, Reykjavík, Iceland
*
*E-mail: [email protected]
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Abstract

Previous studies have shown considerable variability in morphological features and the existence of genetically distinct sibling species in the acanthocephalan Echinorhynchus gadi Zoega in Müller, 1776. The aim of the present study was to follow up and extend those earlier studies by using a combination of DNA analysis and morphometrics to investigate differences between samples of E. gadi from Atlantic cod Gadus morhua L. caught at five fishing grounds in the Baltic Sea and three in different parts of the North Atlantic. Twelve morphological features were measured in 431 specimens of E. gadi, 99 individuals were studied by polymerase chain reaction-restriction fragment length polymorphosm (PCR-RFLP), and selected PCR products were sequenced. The molecular analyses showed the nucleotide sequences of E. gadi rDNA from cod caught at all the sampling sites to be identical. The comparative morphological study, in contrast, revealed significant differences between samples of E. gadi from different sampling sites and showed the separation of E. gadi into two groups corresponding approximately to the systematic classification of cod into the two subspecies, Atlantic G. morhua morhua and Baltic G. morhua callarias. The E. gadi infrapopulation size had a significant effect on some of the morphological features. The results are discussed in relation to cod population biology, the hydrography of the study area and the history of the Baltic Sea formation.

Type
Research Papers
Information
Journal of Helminthology , Volume 86 , Issue 1 , March 2012 , pp. 16 - 25
Copyright
Copyright © Cambridge University Press 2011

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