4.7 Article

Population genomics and sexual signals support reproductive character displacement in Uperoleia (Anura: Myobatrachidae) in a contact zone

期刊

MOLECULAR ECOLOGY
卷 31, 期 17, 页码 4527-4543

出版社

WILEY
DOI: 10.1111/mec.16597

关键词

mitochondrial genome; range expansion; reproductive interference; speciation; unidirectional hybridization

资金

  1. Hermon Slade Foundation
  2. Australian Biological Resources Survey Research Grant
  3. WA Museum's Alcoa Frog Watch programme
  4. National Science Foundation Postdoctoral Research Fellowship in Biology [1811930]
  5. Australian Research Council Linkage Grant
  6. Div Of Biological Infrastructure
  7. Direct For Biological Sciences [1811930] Funding Source: National Science Foundation

向作者/读者索取更多资源

When closely related species come into contact via range expansion, selection favors minimizing costly interspecies reproductive interactions. In a study on a toadlet species complex from northern Australia, population genomic data revealed the geographic origin and secondary contact, providing evidence for reproductive character displacement following range expansion.
When closely related species come into contact via range expansion, both may experience reduced fitness as a result of the interaction. Selection is expected to favour traits that minimize costly interspecies reproductive interactions (such as mismating) via a phenomenon called reproductive character displacement (RCD). Research on RCD frequently assumes secondary contact between species, but the geographical history of species interactions is often unknown. Population genomic data permit tests of geographical hypotheses about species origins and secondary contact through range expansion. We used population genomic data from single nucleotide polymorphisms (SNPs), mitochondrial sequence data, advertisement call data and morphological data to investigate a species complex of toadlets (Uperoleia borealis, U. crassa, U. inundata) from northern Australia. Although the three species of frogs were morphologically indistinguishable in our analysis, we determined that U. crassa and U. inundata form a single species (synonymized here) based on an absence of genomic divergence. SNP data identified the phylogeographical origin of U. crassa as the Top End, with subsequent westward invasion into the range of U. borealis in the Kimberley. We identified six F-1 hybrids, all of which had the U. borealis mitochondrial haplotype, suggesting unidirectional hybridization. Consistent with the RCD hypothesis, U. borealis and U. crassa sexual signals differ more in sympatry than in allopatry. Hybrid males have intermediate calls, which probably reduces attractiveness to females. Integrating population genomic data, mitochondrial sequencing, morphology and behavioural approaches provides an unusually detailed collection of evidence for reproductive character displacement following range expansion and secondary contact.

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