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- Boman, JesperUppsala universitet,Evolutionsbiologi (author)
On the origin of an insular hybrid butterfly species
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- LIBRIS-ID:oai:DiVA.org:uu-532922
- https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-532922URI
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- Most species arise from the divergence of two populations within a species, but this is not only way speciation can occur. A new species can also evolve when diverging lineages hybridize and give rise to a persistent and ecologically differentiated species. Hybrid speciation in animals has been intensely debated, partly because hard evidence for the process have been difficult to gain. Recent access to large-scale, whole-genome sequencing data and development of novel analytical methods have made it more feasible to statistically test for hybrid origin of lineages. Here we report the discovery of a hybrid butterfly lineage. This lineage is mainly inhabiting an island in the Baltic Sea in Northern Europe and was previously described as a subspecies (horkei) of one of the parental species (Aricia artaxerxes). By analyzing whole-genome resequencing data, we conclude that horkei originated as a consequence of hybridization between A. artaxerxes and A. agestis. We show that this hybridization event occurred approximately 54,000 years ago, predating the last glaciation of the current distribution range. Horkei must therefore have persisted long enough to be able to colonize its current distribution range, despite that this range lies between the current ranges of the parental species. The hybrid origin, the maintenance of genomic integrity through time periods with dramatic climatic changes and the expression of a combination of parental traits - such as voltinism and host plant use - suggest that horkei can be considered a distinct species (Aricia horkei stat. nov.). Thus, we add to a growing list of hybrid speciation cases in animals.
Subject headings and genre
- NATURVETENSKAP Biologi Evolutionsbiologi hsv//swe
- NATURAL SCIENCES Biological Sciences Evolutionary Biology hsv//eng
- Biodiversity
- Evolutionary Genetics
- Speciation
- Hybridization
- Hybrid species
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- Nolen, Zachary J.Department of Biology, Lund University, Lund, Sweden (author)
- Backström, Niclas,1969-Uppsala universitet,Evolutionsbiologi(Swepub:uu)nibac839 (author)
- Uppsala universitetEvolutionsbiologi (creator_code:org_t)
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