Please use this identifier to cite or link to this item:
Appears in Collections:Aquaculture Journal Articles
Peer Review Status: Refereed
Title: Host-based identification is not supported by morphometrics in natural populations of Gyrodactylus salaris and G. thymalli (Platyhelminthes, Monogenea)
Author(s): Olstad, Kjetil
Shinn, Andrew
Bachmann, Lutz
Bakke, Torr A
Contact Email:
Keywords: morphology
Atlantic salmon
Salmo salar
Thymallus thymallus
Discriminant analysis
Salmonids Parasites
Issue Date: Dec-2007
Date Deposited: 24-Aug-2009
Citation: Olstad K, Shinn A, Bachmann L & Bakke TA (2007) Host-based identification is not supported by morphometrics in natural populations of Gyrodactylus salaris and G. thymalli (Platyhelminthes, Monogenea). Parasitology, 134 (14), pp. 2041-2052.
Abstract: Gyrodactylus salaris is a serious pest of wild pre-smolt Atlantic salmon (Salmo salar) in Norway. The closely related G. thymalli, originally described from grayling (Thymallus thymallus), is assumed harmless to both grayling and salmon. The 2 species are difficult to distinguish using traditional, morphometric methods or molecular approaches. The aim of this study was to explore whether there is a consistent pattern of morphometrical variation between G. salaris and G. thymalli and to analyse the morphometric variation in the context of ‘diagnostic realism’ (in natural populations). Specimens from the type-material for the 2 species are also included. In total, 27 point-to-point measurements from the opisthaptoral hard parts were used and analysed by digital image processing and uni- and multivariate morphometry. All populations most closely resembled its respective type material, as expected from host species, with the exception of G. thymalli from the Norwegian river Trysilelva. We, therefore, did not find clear support in the morphometrical variation among G. salaris and G. thymalli for an a priori species delineation based on host. The present study also indicates an urgent need for more detailed knowledge on the influence of environmental factors on the phenotype of gyrodactylid populations.
DOI Link: 10.1017/s0031182007003332
Rights: Published in Parasitology. Copyright: Cambridge University Press.; Parasitology, Volume 134, Issue 14, December 2007, pp. 2041 - 2052, published by Cambridge University Press. Copyright © Cambridge University Press 2007.;

Files in This Item:
File Description SizeFormat 
Host-based identification is not supported by morphometrics.pdfFulltext - Published Version154.15 kBAdobe PDFView/Open

This item is protected by original copyright

Items in the Repository are protected by copyright, with all rights reserved, unless otherwise indicated.

The metadata of the records in the Repository are available under the CC0 public domain dedication: No Rights Reserved

If you believe that any material held in STORRE infringes copyright, please contact providing details and we will remove the Work from public display in STORRE and investigate your claim.