Local adaptation and species segregation in two mussel (Mytilus edulis X M. trossulus) hybrid zones

Riginos, Cynthia and Cunningham, Clifford W. (2005) Local adaptation and species segregation in two mussel (Mytilus edulis X M. trossulus) hybrid zones. Molecular Ecology, 14 2: 381-400. doi:10.1111/j.1365-294X.2004.02379.x

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Author Riginos, Cynthia
Cunningham, Clifford W.
Title Local adaptation and species segregation in two mussel (Mytilus edulis X M. trossulus) hybrid zones
Journal name Molecular Ecology   Check publisher's open access policy
ISSN 0962-1083
1365-294X
Publication date 2005-01-01
Sub-type Critical review of research, literature review, critical commentary
DOI 10.1111/j.1365-294X.2004.02379.x
Volume 14
Issue 2
Start page 381
End page 400
Total pages 20
Place of publication Oxford, United Kingdom
Publisher Blackwell Scientific
Language eng
Subject 270000 Biological Sciences
270700 Ecology and Evolution
Abstract Few marine hybrid zones have been studied extensively, the major exception being the hybrid zone between the mussels Mytilus edulis and M. galloprovincialis in southwestern Europe. Here, we focus on two less studied hybrid zones that also involve Mytilus spp.; M. edulis and M. trossulus are sympatric and hybridize on both western and eastern coasts of the Atlantic Ocean. We review the dynamics of hybridization in these two hybrid zones and evaluate the role of local adaptation for maintaining species boundaries. In Scandinavia, hybridization and gene introgression is so extensive that no individuals with pure M. trossulus genotypes have been found. However, M. trossulus alleles are maintained at high frequencies in the extremely low salinity Baltic Sea for some allozyme genes. A synthesis of reciprocal transplantation experiments between different salinity regimes shows that unlinked Gpi and Pgm alleles change frequency following transplantation, such that post-transplantation allelic composition resembles native populations found in the same salinity. These experiments provide strong evidence for salinity adaptation at Gpi and Pgm (or genes linked to them). In the Canadian Maritimes, pure M. edulis and M. trossulus individuals are abundant, and limited data suggest that M. edulis predominates in low salinity and sheltered conditions, whereas M. trossulus are more abundant on the wave-exposed open coasts. We suggest that these conflicting patterns of species segregation are, in part, caused by local adaptation of Scandinavian M. trossulus to the extremely low salinity Baltic Sea environment.
Keyword Allozyme
Hybrid zone
Lap
Mussel
Selection
Speciation
Biochemistry & Molecular Biology
Ecology
Q-Index Code C1

Document type: Journal Article
Sub-type: Critical review of research, literature review, critical commentary
Collections: Excellence in Research Australia (ERA) - Collection
School of Biological Sciences Publications
 
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Citation counts: TR Web of Science Citation Count  Cited 123 times in Thomson Reuters Web of Science Article | Citations
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Created: Wed, 28 Mar 2007, 15:18:51 EST by Dr Cynthia Riginos on behalf of School of Biological Sciences