Species Recognition Is Constrained by Chorus Noise, but Not Inconsistency in Signal Production, in Cope’s Gray Treefrog (Hyla chrysoscelis)

Tanner, Jessie C.; Bee, Mark A.

doi:10.3389/fevo.2020.00256

Cited by 5 publications

(1 citation statement)

References 78 publications

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“…In many anuran species, pulse characteristics are important signals of species recognition and have relatively frequently been documented as examples of traits undergoing reproductive character displacement (Fouquette, 1975;Lemmon, 2009;Littlejohn, 1965;Loftus-Hills & Littlejohn, 1971;Schul & Bush, 2002). Pulse characteristics often show little variation within individuals and thus tend to be suitable for reliably discriminating between conspecific and heterospecific males (Gerhardt, 1991;Shaw & Herlihy, 2000;Tanner & Bee, 2020). By contrast, call duration is often considered a signal of mate quality because of the intrinsic positive relationship between call duration and energy expenditure (Welch et al, 1998;Wells & Taigen, 1986, 1989.…”

Section: Reproductive Character Displacementmentioning

confidence: 99%

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

et al. 2022

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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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