Abstract:
:Postzygotic isolation may be important for maintaining species boundaries, particularly when premating barriers are incomplete. Little is known about the course of events leading from minor environmental mismatches affecting hybrid fitness to severe genetic incompatibilities causing sterility or inviability. We investigated whether reduced reproductive success of hybrid males was caused by suboptimal sperm traits or by more severe genetic incompatibilities in a hybrid zone of pied (Ficedula hypoleuca) and collared flycatchers (F. albicollis) on the island of Öland, Sweden. About 4 per cent hybridization is observed in this population and all female hybrids are sterile. We found no sperm in the ejaculates of most sampled hybrid males, and sperm with abnormal morphology in two hybrids. Furthermore, none of the hybrids sired any offspring because of high levels of hatching failure and extra-pair paternity in their nests. These results from a natural hybrid zone suggest that the spermatogenesis of hybrid males may become disrupted despite little genetic divergence between the parental species.
journal_name
Biol Lettjournal_title
Biology lettersauthors
Alund M,Immler S,Rice AM,Qvarnström Adoi
10.1098/rsbl.2013.0169subject
Has Abstractpub_date
2013-04-10 00:00:00pages
20130169issue
3eissn
1744-9561issn
1744-957Xpii
rsbl.2013.0169journal_volume
9pub_type
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