Journal ArticleDOI
Evolutionary divergence in acoustic signals: causes and consequences
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TLDR
A conceptual framework for testing the relative significance of both adaptive and neutral mechanisms leading to acoustic divergence is summarized, predictions for cases where these processes lead to speciation are predicted, and how their relative importance plays out over evolutionary time are summarized.Abstract:
Acoustic signals mediate mate choice, resource defense, and species recognition in a broad range of taxa. It has been proposed, therefore, that divergence in acoustic signals plays a key role in speciation. Nonetheless, the processes driving divergence of acoustic traits and their consequences in terms of speciation are poorly understood. A review of empirical and comparative studies reveals strong support for a role of sexual selection in acoustic divergence, but the possible concomitant influences of ecological context are rarely examined. We summarize a conceptual framework for testing the relative significance of both adaptive and neutral mechanisms leading to acoustic divergence, predictions for cases where these processes lead to speciation, and how their relative importance plays out over evolutionary time.read more
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Journal ArticleDOI
Variation in song structure along an elevation gradient in a resident songbird
TL;DR: This study found significant variation in song structure along an elevation gradient and that male song also changes significantly at an important ecological threshold, consistent with high- and low-elevation songs that may be used by females to identify and mate with local males.
Dissertation
Breeding biology and ecological niche of the Knysna leaf-folding frog (Afrixalus knysnae)
TL;DR: The future of the ozone layer is under threat from several sources, including volcanic eruptions, as well as from the impacts of climate change and other natural and man-made sources.
Journal ArticleDOI
Underwater sound production varies within not between species in sympatric newts
TL;DR: This work examined individual, sex, and species variation in underwater sound production in adults of two sympatric newt taxa, Ichthyosaura alpestris and Lissotriton vulgaris, and found individual differences explained about 40–50% of total variation in sound parameters.
Journal ArticleDOI
Geographic variation in the duets of the Rufous-naped Wren (Campylorhynchus rufinucha) complex
Wiliam Ku-Peralta,Adolfo G. Navarro-Sigüenza,Luis Sandoval,J. Roberto Sosa-López,J. Roberto Sosa-López +4 more
TL;DR: The results suggest that groups rufinucha and humilis sing the most similar duets, whereas capistratus performs the most divergent duets of the 3 groups, and that variation found within groups may be the result of cultural drift or social selection.
Journal ArticleDOI
Low Geographic and Subspecific Variation in the Loud Call of the Widespread and Phenotypically Cryptic Northern Lesser Galago (Galago senegalensis) Suggests Taxonomic Uniformity.
Magdalena S. Svensson,Thomas M. Butynski,Yvonne A. de Jong,Simon K. Bearder,Irena Schneiderová,Vincent Nijman +5 more
TL;DR: It is suggested that the Eastern Rift Valley and Niger River are significant barriers for G. senegalensis, and wide-ranging species do not necessarily exhibit large amounts of variation in their vocal repertoire, which may also be present in nocturnal primates with smaller geographic ranges.
References
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Journal ArticleDOI
Signals, signal conditions, and the direction of evolution
TL;DR: Sensory systems, signals, signaling behavior, and habitat choice are evolutionarily coupled and should coevolve in predictable directions, determined by environmental biophysics, neurobiology, and the genetics of the suites of traits.
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Sexual selection, social competition, and speciation
TL;DR: Patterns of variation in socially selected characters demonstrate the wisdom of Darwin's distinction between natural and sexual selection, and the applicability of sexual selection theory to social competition in general.
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Ecological Sources of Selection on Avian Sounds
TL;DR: In this article, sound propagation tests were made in forest, edge, and grassland habitats in Panama to quantify pure tone and random noise band sound transmission levels, and the sounds of birds in each habitat were analyzed to determine the emphasized frequency, frequency range, and sound type (whether pure tonelike or highly modulated).
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Evidence for Ecological Speciation and Its Alternative
TL;DR: Tests of parallel evolution of reproductive isolation, trait-based assortative mating, and reproductive isolation by active selection have demonstrated that ecological speciation is a common means by which new species arise.
Journal ArticleDOI
Public information: from nosy neighbors to cultural evolution.
TL;DR: A large body of evidence suggests that human decision-making is strongly influenced by the behavior of others, which may then affect biological evolution.