Gonadal alterations in male whitefish Coregonus fatioi: No evidence for genetic damage reducing viability in early life stages

Urbach D, Britschgi A, Jacob A, Bittner D, Bernet D, Wahli T, Yoccoz NG, & Wedekind C (2008). Gonadal alterations in male whitefish Coregonus fatioi: No evidence for genetic damage reducing viability in early life stages. Diseases of Aquatic Organisms 81 (2): 119-125. DOI:10.3354/dao01952.

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Abstract

In recent years, numerous cases of morphological gonadal alterations in fish have been recorded throughout the world and across a wide range of species. In the whitefish Coregonus fatioi from the pre-alpine Lake Thun (Switzerland), the frequency of gonadal alterations is particularly high and the variety of alteration types large. Little is known about the proximal causes and the direct consequences of these morphological features on population persistence. In particular, the potential for the observed alterations to be the phenotypic expression of reduced genetic quality has not yet been addressed. In this study, we used offspring survival during embryogenesis as a proximate indicator of male genetic quality and tested whether the presence of gonadal alterations in males is an indicator of reduced quality. Embryos resulted from in vitro fertilizations of gametes from 126 males and females. We found no significant correlation between embryo survival and gonadal alteration in adults. Our findings suggest that in C. fatioi of Lake Thun, alterations in gonad morphology are not a phenotypic expression of variation in genetic quality.

Item Type: Article
Uncontrolled Keywords: Embryo survival; Genetic quality; Gonadal alterations; Lake Thun; Whitefish
Research Programs: Evolution and Ecology (EEP)
Depositing User: IIASA Import
Date Deposited: 15 Jan 2016 08:40
Last Modified: 07 Sep 2016 08:01
URI: http://pure.iiasa.ac.at/8499

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