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Phenotypic and genetic divergence within a single whitefish form – detecting the potential for future divergence.
JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift)
 
ID 2315883
Author(s) Hirsch, Philipp Emanuel; Eckmann, Reiner; Oppelt, Claus; Behrmann-Godel, Jasminca
Author(s) at UniBasel Hirsch, Philipp
Year 2013
Title Phenotypic and genetic divergence within a single whitefish form – detecting the potential for future divergence.
Journal Evolutionary applications
Volume 6
Number 8
Pages / Article-Number 1119-32
Keywords adaptive radiation, resource polymorphisms, respeciation, sympatric speciation
Abstract Human-induced nutrient input can change the selection regime and lead to the loss of biodiversity. For example, eutrophication caused speciation reversal in polymorphic whitefish populations through a flattening of littoral-pelagic selection gradients. We investigated the current state of phenotypic and genetic diversity in whitefish (Coregonus macrophthalmus) in a newly restored lake whose nutrient load has returned to pre-eutrophication levels and found that whitefish spawning at different depths varied phenotypically and genetically: individuals spawning at shallower depth had fewer gill rakers, faster growth, and a morphology adapted to benthic feeding, and they showed higher degrees of diet specialization than deeper spawning individuals. Microsatellite analyses complemented the phenotype analyses by demonstrating reproductive isolation along different spawning depths. Our results indicate that whitefish still retain or currently regain phenotypic and genetic diversity, which was lost during eutrophication. Hence, the population documented here has a potential for future divergence because natural selection can target phenotypes specialized along re-established littoral-pelagic selection gradients. The biodiversity, however, will have better chances to return if managers acknowledge the evolutionary potential within the local whitefish and adapt fishing and stocking measures.
Publisher Blackwell
URL http://onlinelibrary.wiley.com/doi/10.1111/eva.12087/abstract
edoc-URL http://edoc.unibas.ch/dok/A6212206
Full Text on edoc No
Digital Object Identifier DOI 10.1111/eva.12087
PubMed ID http://www.ncbi.nlm.nih.gov/pubmed/24478795
ISI-Number WOS:000327900700001
Document type (ISI) Article
 
   

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29/03/2024