title: Contrasting egg recognition between European and Asian populations of tree sparrows (Passer montanus).
abstract: Although many biological phenotypes are generally regarded as consistent across the distributional range of a species, some traits such as egg discrimination behavior have been shown to display extensive intraspecific variation as a response to selection from brood parasitism. We investigated the egg recognition ability in an Asian population of tree sparrows (Passer montanus), and we compared that with the ability to recognize and reject intraspecific foreign eggs in a population in Europe. Extensive artificial parasitism with model eggs and real eggs of eight sympatric birds that vary in background color and markings revealed that egg recognition capacity is completely absent in this Asian population of tree sparrows. This result contrasts with previous studies in European populations showing extensive ability for discriminating between own and foreign eggs. Different evolutionary equilibria or differences in the risk of conspecific parasitism may account for differences in egg discrimination ability between European and Asian populations of tree sparrows.
authors.affiliation: Ministry of Education Key Laboratory for Tropical Plant and Animal Ecology, College of Life Sciences, Hainan Normal University, Haikou 571158, China.
authors.forename: Canchao
authors.initials: C
authors.lastname: Yang
authors.affiliation: School of Life Sciences, Guizhou Normal University, Guiyang 550001, China.
authors.forename: Longwu
authors.initials: L
authors.lastname: Wang
authors.affiliation: Ministry of Education Key Laboratory for Tropical Plant and Animal Ecology, College of Life Sciences, Hainan Normal University, Haikou 571158, China. Electronic address: liangwei@hainnu.edu.cn.
authors.forename: Wei
authors.initials: W
authors.lastname: Liang
authors.affiliation: Laboratoire d'Ecologie, Systématique et Evolution, CNRS UMR 8079, Université Paris-Sud, Bâtiment 362, Orsay Cedex F-91405, France.
authors.forename: Anders P
authors.initials: AP
authors.lastname: Møller
mesh_terms: D000818:Animals; D004528:Egg Shell / Q000033:anatomy & histology*; D010063:Ovum; D021641:Recognition, Psychology; D046370:Sparrows
keywords: Artificial parasitism; Egg discrimination; Intraspecific brood parasitism; Parasitism risk; Passer montanus