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Female-biased gene flow between two species of Darwin’s finches
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Medical Biochemistry and Microbiology. Uppsala University, Science for Life Laboratory, SciLifeLab.ORCID iD: 0000-0003-4826-0349
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Medical Biochemistry and Microbiology. Uppsala University, Science for Life Laboratory, SciLifeLab.
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Medical Biochemistry and Microbiology. Uppsala University, Science for Life Laboratory, SciLifeLab.ORCID iD: 0000-0003-1141-2863
Department of Ecology and Evolutionary Biology, Princeton University, Princeton, NJ, USA.
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2019 (English)In: Article in journal (Refereed) Submitted
Abstract [en]

The mosaic nature of hybrid genomes is well recognized, but little is known of how they are shaped initially by patterns of breeding, selection, recombination and differential incompatibilities. On the small Galápagos island of Daphne Major two species of Darwin’s finches, Geospiza fortis and G. scandens, hybridize rarely and backcross bidirectionally with little or no loss of fitness under conditions of plentiful food. We used whole genome sequences to compare genomes from periods before and after successful interbreeding followed by backcrossing. We inferred extensive introgression from G. fortis to G. scandens on autosomes and mitochondria but not on the Z chromosome. The unique combination of long-term field observations and genomic data shows that the reduction of gene flow for Z-linked loci reflects female-biased gene flow, arising from hybrid male disadvantage in competition for territories and mates, rather than from genetic incompatibilities at Z-linked loci.

Place, publisher, year, edition, pages
2019.
Keywords [en]
Darwin's finches, introgression, hybridisation
National Category
Ecology Evolutionary Biology Genetics
Identifiers
URN: urn:nbn:se:uu:diva-396776OAI: oai:DiVA.org:uu-396776DiVA, id: diva2:1368971
Available from: 2019-11-09 Created: 2019-11-09 Last updated: 2019-11-09

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Lamichhaney, SangeetHan, FanWebster, Matthew ThomasAndersson, Leif

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