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Discrimination and ejection of eggs and nestlings by the fan-tailed gerygone from New Caledonia

Current Zoology 2021年第6期67卷 653-663页

作者： Alfredo ATTISANO Nozomu J.SATO Keita D.TANAKA Yuji OKAHISA Keisuke UEDA Roman GULA Jörn THEUERKAUF Museum and Institute of Zoology Polish Academy of SciencesWarsawPoland Japan Bird Research Association TokyoJapan Department of Life Sciences Rikkyo UniversityTokyoJapan

Nestling rejection is a rare type of host defense against brood parasitism compared with egg ***,host defenses at both egg and nestling stages could be based on similar underlying discrimination mechanisms but,due to the rarity of nestling rejector hosts,few studies have actually tested this *** investigated egg and nestling discrimination by the fan-tailed gerygone Gerygone flavolateralis,a host that seemingly accepts nonmimetic eggs of its parasite,the shining bronze-cuckoo Chalcites lucidus,but ejects mimetic parasite *** introduced artificial eggs or nestlings and foreign gerygone nestlings in gerygone nests and compared begging calls of parasite and host *** found that the gerygone ejected artificial eggs only if their size was smaller than the parasite or host *** of artificial nestlings did not depend on whether their color matched that of the *** frequency of ejection increased during the course of the breeding season mirroring the increase in ejection frequency of parasite nestlings by the ***-fostered gerygone nestlings were frequently ejected when lacking natal down and when introduced in the nest before hatching of the foster brood,but only occasionally when they did not match the color of the foster *** calls differed significantly between parasite and host nestlings throughout the nestling *** results suggest that the fan-tailed gerygone accepts eggs within the size range of gerygone and cuckoo eggs and that nestling discrimination is based on auditory and visual cues other than skin *** highlights the importance of using a combined approach to study discrimination mechanisms of hosts.

关键词： begging calls brood parasitism co-evolutionary arms race egg discrimination nestling discrimination nestling polymorphism

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