Dispersal, philopatry and intergroup relatedness: fine‐scale genetic structure in the white‐breasted thrasher, Ramphocinclus brachyurus

摘要: Dispersal is a fundamental process influencing evolution, social behaviour, and the long-term persistence of populations. We use both observational genetic data to investigate dispersal, kin-clustering intergroup relatedness in white-breasted thrasher, Ramphocinclus brachyurus, cooperatively breeding bird that globally endangered. Mark-resighting suggested sex-biased with females dispersing over greater distances while males remained philopatric. Accordingly, spatial autocorrelation analysis showed highly significant fine-scale structure among males, but not females. This structuring male population resulted very high levels between dominant at neighbouring nests, similar seen within cooperative groups many species where kin selection cited as cause cooperation. By implication, between-group well within-group cooperation may be important, potentially creating feedback loop which short-distance dispersal by leads formation clusters turn facilitate nepotistic interactions favour further local recruitment. The strength autocorrelation, measured coefficient, r, was approximately two three times than reported previous studies animals. Relatively short have negative impact on thrasher's ability colonize new areas, influence isolated should taken into account when designating protected areas or selecting sites for habitat restoration.