Department of Entomology, Swedish Museum of Natural History, Stockholm, Sweden.
Department of Zoology, Stockholm University, Stockholm, Sweden.
J Evol Biol. 2010 Oct;23(10):2112-2122. doi: 10.1111/j.1420-9101.2010.02072.x. Epub 2010 Aug 17.
In area, New Caledonia is the smallest of the world's 25 official biodiversity hotspots, but in many taxonomic groups, the island has the highest concentration of species on earth, particularly so in the freshwater insect order Trichoptera. This study aims at applying molecular data and morphology for estimating the real species diversity of the genus Agmina on New Caledonia and investigating potential effects of ultramafic rock substrate on diversification. A dated molecular phylogeny was applied to study diversity and diversification related to geological substrate using the dispersal-extinction-cladogenesis model, diva and Bayesian ancestral character reconstruction. More than 47 species (>63%) were unknown to science. Initial radiation occurred on ultramafic substrate followed by several independent dispersal events to nonultramafic substrate. The rate of shift from ultramafic to nonultramafic substrate was significantly higher than the rate of shift in the opposite direction, indicating a possible cost associated with living on ultramafic substrate.
在面积方面，新喀里多尼亚是世界 25 个官方生物多样性热点地区中最小的一个，但在许多分类群中，该岛拥有地球上物种最集中的地方，特别是淡水昆虫目 Trichoptera。本研究旨在应用分子数据和形态学来估计新喀里多尼亚 Agmina 属的真实物种多样性，并研究超镁铁质岩石基质对多样化的潜在影响。应用一个有时间校准的分子系统发育来研究与地质基质相关的多样性和多样化，使用扩散-灭绝-分支分析模型、diva 和贝叶斯祖先特征重建。超过 47 种 (>63%)物种对科学界来说是未知的。最初的辐射发生在超镁铁质基质上，随后发生了几次独立的向非超镁铁质基质的扩散事件。从超镁铁质基质向非超镁铁质基质的转变速度明显高于相反方向的转变速度，这表明生活在超镁铁质基质上可能存在相关成本。
