02027nas a2200217   4500008004100000022001400041245015600055210006900211260001600280520121300296100002401509700002901533700002301562700002201585700002301607700002301630700001801653700002101671700002301692856009401715       2018                        eng d  a0024-406600aGlobal song divergence in barn swallows (Hirundo rustica): exploring the roles of genetic, geographical and climatic distance in sympatry and allopatry0 aGlobal song divergence in barn swallows Hirundo rustica explorin  cJul-03-20193 a<p>Divergence in acoustic signals plays an important role in the production and maintenance of biodiversity in numerous taxa. In this study, we assess patterns of acoustic divergence in geographically isolated and sympatric subspecies of barn swallows (Hirundo rustica), including analyses of whether song differentiation varies with geographical isolation, genetic distance and climatic distance. We provide the first description of geographical variation in song among five of six currently recognized barn swallow subspecies. Temporal traits describing terminal trills were the most distinct song traits among subspecies, adding to growing evidence that trills are important in speciation among many birds, insects and fish. Across a ~6000 km transect of Russia, acoustic distance was predicted by genetic and geographical distance, but not climatic distance. We also found no reproductive character displacement of song traits in a contact zone between H. r. rustica and H. r. tytleri. Based on patterns discovered in this study, we infer an important role of sexual selection, genetic and/or cultural drift in the gradual build-up of acoustic divergence, which is accelerated in small populations.</p>
1 aWilkins, Matthew, R1 aScordato, Elizabeth, S C1 aSemenov, Georgy, A1 aKaraardiÇ, Hakan1 aShizuka, Daizaburo1 aRubtsov, Alexander1 aPap, Peter, L1 aShen, Sheng-Feng1 aSafran, Rebecca, J  uhttps://academic.oup.com/biolinnean/advance-article/doi/10.1093/biolinnean/bly012/494352402264nas a2200217   4500008004100000022001300041245010200054210006900156260001600225300001200241490000800253520158100261653002201842653001801864653002401882653001301906653001601919100002201935700002301957856006601980       2017                        eng d  a0003347200aIntroductory whistle is sufficient for early song recognition by golden-crowned sparrow nestlings0 aIntroductory whistle is sufficient for early song recognition by  cJan-11-2017  a83 - 880 v1333 a<p>Many songbird species have a predisposition to learn conspecific songs, suggesting song learning may be guided by an innate auditory template. Evidence for such a template includes preferential response to conspecific song in early life, even before song learning begins. A prime example of an innate cue for selective song learning is the introductory whistle of white-crowned sparrows, Zonotrichia leucophrys. The songs of its sister species, the golden-crowned sparrow, Zonotrichia atricapilla, also contain an introductory whistle, which differs in structure from that of white-crowned sparrows. Here we tested the ability of nestling golden-crowned sparrows in a sympatric population to discriminate between conspecific and heterospecific songs based on introductory whistles alone, prior to the onset of song learning. Golden-crowned sparrow nestlings responded with more chirps to playbacks of conspecific whistles than to heterospecific (white-crowned sparrow) whistles, and they responded similarly to full conspecific songs and conspecific whistles alone. We suggest that the introductory whistle alone is sufficient for song recognition in the golden-crowned sparrow. We discuss similarities and differences in the role of the introductory whistle between these sister taxa, and how this divergent song phrase may share a role in species recognition in both sister species. Identifying the cues underlying song recognition prior to song learning could be key to understanding the evolution of behavioural isolation between closely related songbird species.</p>
10aacoustic template10asong learning10aspecies recognition10awhistles10aZonotrichia1 aHudson, Emily, J.1 aShizuka, Daizaburo  uhttp://linkinghub.elsevier.com/retrieve/pii/S0003347217303056