In:
Molecular Ecology, Wiley, Vol. 23, No. 18 ( 2014-09), p. 4590-4602
Kurzfassung:
Cytonuclear discordance in contact zones between related lineages is common, with mitochondrial clines often being displaced from clines in nuclear allele frequency. Proposed explanations for such a pattern include adaptive introgression of mt DNA or a neutral wake of mt DNA being left behind following hybrid zone movement. However, studies investigating these hypotheses are rare. Our previous survey of genetic variation in the long‐toed salamander ( Ambystoma macrodactylum ) highlighted a potential case of cytonuclear discordance between two lineages in western Canada. Here, we use additional markers and samples to clarify the extent of this discordance. We simultaneously assess the feeding performance of individuals in a common environment to test for an association between mitotype and individual performance. The genetic results confirm a general pattern of cytonuclear discordance in the focal region. However, we also observed more limited introgression of a diagnostic nuclear marker. Intriguingly, although there were differences in individual performance associated with the transition between mitotypes, these differences were not fully explained by mitotype. Instead, the lowest performance was observed in individuals demonstrating the greatest mismatch between mt DNA and all nuclear markers, suggesting the potential for cytonuclear incompatibilities to be acting. These results highlight the complexity of understanding the causes and consequences of mt DNA introgression and cytonuclear discordance in contact zones.
Materialart:
Online-Ressource
ISSN:
0962-1083
,
1365-294X
DOI:
10.1111/mec.2014.23.issue-18
Sprache:
Englisch
Verlag:
Wiley
Publikationsdatum:
2014
ZDB Id:
2020749-9
ZDB Id:
1126687-9
SSG:
12
