Please use this identifier to cite or link to this item:
Title: Contaminant driven genetic erosion: a case study with Daphnia longispina
Author: Ribeiro, Rui
Baird, Donald J.
Soares, Amadeu M. V. M.
Lopes, Isabel
Keywords: Genetic diversity
Directional selection
Fitness costs
Acid mine drainage
Issue Date: May-2012
Publisher: Society of Environmental Toxicology and Chemistry Press (SETAC)
Abstract: Natural populations exposed to pollutants are predicted to experience a loss of genetic diversity, especially through genetic drift, gene flow (emigration), and/or selection (as sensitive genotypes may be lost). In the present study, the authors discuss the use of selectable markers and neutral markers to evaluate a contaminant-driven loss of genetic diversity and possible implications of genetic erosion on populations' viability. Viability could be reduced by altering life history parameters, especially due to fitness costs associated with the acquisition of resistance and/or by compromising the resilience and adaptation to future environmental changes. This discussion aims at an integrated and critical analysis of this topic; it is illustrated by several independent studies (each with its own specific objectives) that were carried out at the same location with Daphnia longispina populations. To the best of the authors' knowledge, this is the most extensively documented case study on genetic erosion of a natural zooplankton population. Directional selection has been found to be a main factor of microevolution; therefore, genetic erosion was detected by monitoring suitable phenotypic markers. Genetic drift was found to be probably irrelevant or masked by other factors, especially gene flow. Although the acquisition of resistance apparently did not entail genetically determined fitness costs under uncontaminated conditions, the present case study suggests the possibility of a further loss of genotypes due to some negative linkages between the sensitivity to potential ulterior toxicants.
Peer review: yes
DOI: 10.1002/etc.1802
ISSN: 0730-7268
Appears in Collections:CESAM - Artigos

Files in This Item:
File Description SizeFormat 
Ribeiro et al. - 2012 - Contaminant driven genetic erosion A case study w.pdf163.21 kBAdobe PDFrestrictedAccess

Formato BibTex MendeleyEndnote Degois 

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