Ranius Thomas, Hedin Jonas
Department of Zoology, University of Lund, 223 62, Helgonav. 3, Lund, Sweden.
Department of Ecology, University of Lund, 223 62, Lund, Sweden.
Oecologia. 2001 Feb;126(3):363-370. doi: 10.1007/s004420000529. Epub 2001 Feb 1.
The dispersal of an endangered beetle, Osmoderma eremita, that lives in tree hollows, was studied by mark-release-recapture with pitfall traps. As only a small proportion of all dispersals is observed by this method, a simulation model was constructed to estimate the dispersal rate per individual. The model results suggest that 15% of the adults leave the original tree for another hollow tree, and consequently most individuals remain in the same tree throughout their entire life. This suggests that each hollow tree sustains a local population with limited connection with the populations in surrounding trees. It supports the view that O. eremita has a metapopulation structure, with each tree possibly sustaining a local population, and with the population in an assemblage of trees forming a metapopulation. Low dispersal rate and range make the species vulnerable to habitat fragmentation, probably at a scale of only a few hundred meters.
通过使用陷阱诱捕法进行标记重捕研究，对生活在树洞中一种濒危甲虫——裸蛛甲（Osmoderma eremita）的扩散情况展开了调查。由于通过这种方法只能观测到所有扩散情况中的一小部分，因此构建了一个模拟模型来估算个体的扩散率。模型结果表明，15%的成年甲虫会离开原来的树，前往另一棵中空的树，因此大多数个体在其整个生命周期中都留在同一棵树上。这表明每棵中空的树维持着一个局部种群，与周围树木中的种群联系有限。这支持了裸蛛甲具有集合种群结构的观点，即每棵树可能维持一个局部种群，而一组树木中的种群构成一个集合种群。低扩散率和扩散范围使该物种容易受到栖息地破碎化的影响，可能仅在几百米的尺度上就会如此。
