Asymmetric viability of reciprocal-cross hybrids between crested and marbled newts (triturus cristatus and t. marmoratus)
Arntzen, JW, Jehle, R, Bardacki, F, Burke, T and Wallis, GP 2009, 'Asymmetric viability of reciprocal-cross hybrids between crested and marbled newts (triturus cristatus and t. marmoratus) ' , Evolution, 63 , pp. 1191-1202.
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Hybridization between divergent lineages often results in reduced hybrid viability. Here we report findings from a series of independent molecular analyses over several seasons on four life stages of F1 hybrids between the newts Triturus cristatus and T. marmoratus. These two species form a bimodal hybrid zone of broad overlap in France, with F1 hybrids making up about 4% of the adult population. We demonstrate strong asymmetry in the direction of the cross, with one class (cristatus-mothered) making up about 90% of F1 hybrids. By analyzing embryos and hatchlings, we show that this asymmetry is not due to prezygotic effects, as both classes of hybrid embryos are present at similar frequencies, implicating differential selection on the two hybrid classes after hatching. Adult F1 hybrids show a weak Haldane effect overall, with a 72% excess of females. The rarer marmoratusmothered class, however, consists entirely of males. The absence of females from this class of adult F1 hybrids is best explained by an incompatibility between the cristatus X chromosome and marmoratus cytoplasm. It is thus important to distinguish the two classes of reciprocal-cross hybrids before making general statements about whether Haldane’s rule is observed.
|Uncontrolled Keywords:||Allozyme, Bateson–Dobzhansky–Muller incompatibility, cytonuclear incompatibility, hybridization, microsatellite, mtDNA, postzygotic isolation asymmetry, Triturus|
|Themes:||Subjects / Themes > Q Science > QL Zoology|
Subjects / Themes > Q Science > QH Natural history > QH301 Biology
Subjects outside of the University Themes
|Schools:||Colleges and Schools > College of Science & Technology|
Colleges and Schools > College of Science & Technology > School of Environment and Life Sciences
Colleges and Schools > College of Science & Technology > School of Environment and Life Sciences > Ecosystems and Environment Research Centre
|Journal or Publication Title:||Evolution|
|Depositing User:||Users 29196 not found.|
|Date Deposited:||30 Oct 2009 10:18|
|Last Modified:||27 Sep 2011 12:14|
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