Post-fragmentation population structure in a cooperative breeding Afrotropical cloud forest bird: emergence of a source-sink population network.

摘要: The impact of demographic parameters on the genetic population structure and viability organisms is a long-standing issue in study fragmented populations. Demographic tools are now readily available to estimate census effective sizes migration gene flow rates with increasing precision. Here we analysed demography over recent 15year time span five remnant populations Cabanis’s greenbul (Phyllastrephus cabanisi), cooperative breeding bird severely cloud forest habitat. Contrary our expectation, admixture slightly increased, rather than decreased between two sampling periods. In spite small tiny remnants, none showed evidence bottleneck. Approximate Bayesian modelling, however, suggested that differentiation coincided at least partially an episode habitat fragmentation. ratio meta-Ne meta-Nc was relatively low for birds, which expected species, while Ne/Nc ratios strongly varied among local While overall trend may suggest greenbuls increasingly cope fragmentation, period these trends were documented short relative average longevity tropical species. Furthermore, critically Nc remnants keep species prone environmental stochasticity, it remains open if, what extent, its behaviour helps buffer such effects.