Hybrid vocalizations are effective within, but not outside, an avian hybrid zone

Hartog, Paula M. den; Kort, Selvino R. de; Cate, Carel ten

doi:10.1093/beheco/arm018

Cited by 27 publications

(29 citation statements)

References 49 publications

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“…In 2008, there were n = 8 dif- During every trial, the focal individual received two playbacks-one conspecific and one heterospecific (matched pair samples). However, to avoid carry-over effects in playback designs (den Hartog et al 2007), in half the trials the conspecific stimulus was played first followed by the heterospecific song, and in the other half it was vice versa. Responses to the playback tapes were coded in the following manner: 0 = no visible or acoustic response, 1 = weak response (changing/altering of song, calling, or dipping, but no approach), 2 = medium response (approaching the speaker but less than 10 m, or 1-2 flights in the direction of the speaker), 3 = strong response approaching the speaker up to 10 m at least once), 4 = very strong response (two approaches nearer than 10 m or minimum distance below 5 m).…”

Section: Playback Presentationmentioning

confidence: 99%

Phylogeography, pre-zygotic isolation and taxonomic status in the endemic Cyprus Wheatear Oenanthe cypriaca

et al. 2011

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The insular endemic Cyprus Wheatear Oenanthe cypriaca has been considered as a subspecies of Pied Wheatear O. pleschanka. However, due to several differences in behaviour, habitat selection and morphology, it is currently treated by most authors as an independent species. Here, we used mitochondrial nucleotide sequences of the cytochrome oxidase subunit 1 gene (679 base pairs), playback experiments and dummy presentations to assess the status of O. cypriaca. For the playback experiments we used the conspecific song, and heterospecific songs of the two subspecies of Black-eared Wheatear O. hispanica hispanica and O. hispanica melanoleuca, O. pleschanka, and Finsch's Wheatear O. finschii. Experimental dummy presentations included O. cypriaca, O. pleschanka and a dark and light morph of O. h. melanoleuca. O. cypriaca responded significantly stronger towards the conspecific model and towards conspecific playbacks than towards heterospecific stimuli. ML and BI analyses support the close relationship between O. cypriaca, O. pleschanka and O. h. melanoleuca. With a relative high posterior probability value (0.98), O. cypriaca clusters closer to O. h. melanoleuca from Iran and Israel (on migration) and O. pleschanka from Iran than to O. pleschanka obtained from Kazakhstan, Russia, Mongolia and wintering areas in East Africa (Kenya). The scenario suggests that O. cypriaca might be either a relatively young taxon, which is yet behavioural distinct, but genetically still similar to its sister populations on the mainland. Alternatively, we may assume a close relationship as an indication for potential ongoing hybridisation processes involving all three forms.

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Section: Playback Presentationmentioning

confidence: 99%

Phylogeography, pre-zygotic isolation and taxonomic status in the endemic Cyprus Wheatear Oenanthe cypriaca

et al. 2011

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“…Where the species occur together, young turtledoves have a chance to hear vocalizations of both species, not just vocalizations of their own species as in allopatry. In this case, males do not show a behavioral response difference to conspecific or heterospecific same-sex vocalizations where their ranges overlap, but they do respond more strongly to conspecific vocalizations where they occur separately [den Hartog et al, 2007]. Subspecies of female Coturnix quail that were raised without access to adult calls respond more to conspecific calls than to calls of the other subspecies [Deregnaucourt and Guyomarc'h, 2003].…”

Section: The Caudomedial Nidopallium and The Evolution Of Call Percepmentioning

confidence: 99%

Sex-Dependent Species Discrimination in Auditory Forebrain of Naturally Hybridizing Birds

2009

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Pairs of individuals breed together only if they recognize each other as the same species, but the process of recognizing conspecifics can depend on flexible criteria even when species-specific signals are innate and fixed. This study examines species recognition in naturally hybridizing sister species, California and Gambel’s quail (Callipepla californica and Callipepla gambelii), that have vocalizations which are not learned. Specifically, this study tests whether being raised in a vocalizing mixed-species cohort affects neural activity in the adult auditory forebrain in response to heterospecific and conspecific calls. After hatching, quail chicks were raised either with their own kind or with both species. Once reaching reproductive condition, each adult was played a recording that was one of three types: Gambel’s quail opposite-sex contact calls; California quail opposite-sex contact calls; or synthetic tones. Brains were collected following playback and assessed for neuronal activity by quantifying expression of the protein of the immediate early gene, ZENK, in two brain regions, the caudomedial nidopallium (NCM) and the caudomedial mesopallium (CMM). ZENK levels were greater in NCM of males than females, but female NCM cells responded differentially to conspecific compared to heterospecific calls. Namely, females had more immuno-positive NCM cells when they heard conspecific calls rather than heterospecific male calls. Early experience with heterospecific broodmates did not alter neural responses in the NCM or CMM to heterospecific vocalizations. This study suggests that the NCM plays a role in species discrimination but that rearing condition does not alter the response in these non-vocal-learning species.

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“…Song divergence has evolved under the pressure of either ecological selection and/or social interactions (Payne 1996;Nordby et al 2000). In some cases, differential responses to divergent acoustic signals may result in reproductive isolation (Slabbekoorn and Smith 2002;Edwards et al 2005), as species-specific vocalization may contribute to pre-mating reproductive barriers (den Hartog et al 2007). Song divergence therefore could be an important step in the speciation of birds (Irwin and Price 1999).…”

Section: Introductionmentioning

confidence: 99%

Differential response of males of a subarctic population of Bluethroat Luscinina svecica svecica to playbacks of their own and foreign subspecies

et al. 2011

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Differences in vocalization between subspecies of songbirds may influence intraspecific interactions including mate choice and territorial behavior, and contribute to their further divergence by strengthening premating reproductive isolation. We have recently shown that songs of two Bluethroat subspecies, Luscinia svecica svecia and L. s. cyanecula, differ in spectral characteristics and structure. Here, in a first experimental test of whether these differences are biologically relevant, we compared responses of L. s. svecica males to both types of songs. Altogether 19 males from a subartic population in Abisko, Sweden, were exposed to playbacks of songs from the two subspecies, accompanied by display of a stuffed Bluethroat lacking subspecies-specific colour marks. These stimuli were presented in random order, separated by over 1 h. We evaluated two largely uncorrelated components of male responses: non-vocal territorial behavior, and singing activity. A significant difference in reaction to subspecies playbacks was observed in aggressive behavior: independently of the song order, males generally responded more strongly to playback of their own subspecies. In contrast, playback order rather than subspecies identity significantly influenced the singing activity, which usually increased in the second trial. A more detailed analysis nevertheless suggested that vocal responses of birds exposed first to playback of their own subspecies were stimulated in the subsequent trial but not vice versa. Our results show that Bluethroats clearly discriminate the two song types, indicating the potential for subspecies recognition. Further experimental work is needed to assess the general validity of these patterns.

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Hybrid vocalizations are effective within, but not outside, an avian hybrid zone

Cited by 27 publications

References 49 publications

Phylogeography, pre-zygotic isolation and taxonomic status in the endemic Cyprus Wheatear Oenanthe cypriaca

Phylogeography, pre-zygotic isolation and taxonomic status in the endemic Cyprus Wheatear Oenanthe cypriaca

Sex-Dependent Species Discrimination in Auditory Forebrain of Naturally Hybridizing Birds

Differential response of males of a subarctic population of Bluethroat Luscinina svecica svecica to playbacks of their own and foreign subspecies

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