Visual mate preference evolution during butterfly speciation is linked to neural processing genes
Many animal species remain separate not because their individuals fail to produce viable hybrids but because they “choose” not to mate. However, we still know very little of the genetic mechanisms underlying changes in these mate preference behaviours. Heliconius butterflies display bright warning p...
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Veröffentlicht in: | Nature communications 2020-09, Vol.11 (1), p.4763-4763, Article 4763 |
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Zusammenfassung: | Many animal species remain separate not because their individuals fail to produce viable hybrids but because they “choose” not to mate. However, we still know very little of the genetic mechanisms underlying changes in these mate preference behaviours.
Heliconius
butterflies display bright warning patterns, which they also use to recognize conspecifics. Here, we couple QTL for divergence in visual preference behaviours with population genomic and gene expression analyses of neural tissue (central brain, optic lobes and ommatidia) across development in two sympatric
Heliconius
species. Within a region containing 200 genes, we identify five genes that are strongly associated with divergent visual preferences. Three of these have previously been implicated in key components of neural signalling (specifically an
ionotropic glutamate receptor
and two
regucalcins
), and overall our candidates suggest shifts in behaviour involve changes in visual integration or processing. This would allow preference evolution without altering perception of the wider environment.
The genetic mechanisms underlying mate choice decisions can inform our understanding of speciation. A study on
Heliconius
butterflies identifies 5 candidate genes that would allow sympatric species to evolve distinct preferences without altering their visual perception of the wider environment. |
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ISSN: | 2041-1723 2041-1723 |
DOI: | 10.1038/s41467-020-18609-z |