Molecular evolution and radiation of dung beetles in Madagascar
Molecular evolution and radiation of dung beetles in Madagascar
复制标题
DOI：
10.1111/j.1096-0031.2006.00139.x
复制
发表时间：
2007-04-01
期刊：
影响因子：
3.6
通讯作者：
Hanski, Ilkka
中科院分区：
文献类型：
--
作者：
Orsini, Luisa;Koivulehto, Helena;Hanski, Ilkka
马达加斯加是世界第四大岛屿，拥有多种气候和生态系统。环境多样性加上悠久的隔离历史（160 马来西亚林吉特），在不同的分类水平上产生了高度的特有现象，使马达加斯加成为全球生物多样性的热点之一。以 Canthonini 和 Helictopleurini 两个族为代表的粪甲虫是一个大型昆虫分类群的典范。螺旋侧耳鱼完全是马达加斯加特有的，而细角鱼是马达加斯加特有的。利用线粒体和核基因的数据，对 44 个物种的样本进行了系统发育关系的研究。 Canthonini 的系统发育由几个不同的分支组成，可能反映了马达加斯加的多次殖民化。系统发育并不支持所有属的当前分类法。螺旋侧耳菌的系统发育缺乏超特异性水平的统计支持，并且螺旋侧耳菌种间的遗传分化与西班牙侧耳菌属内的物种之间的遗传分化相当。这些结果表明，Helictopleurini 经历了快速的物种形成，并且很可能比 Canthonini 更晚，这与基于昆虫 mtDNA 突变率以及有关全球粪甲虫的系统学和地理分布的知识估计的辐射时间一致。对序列组成的详细分析确定了马达加斯加粪甲虫和其他昆虫的常见模式。 (c) 威利亨尼格协会 2007 年。
Madagascar is the world's fourth largest island and has a wide range of climates and ecosystems. Environmental diversity combined with long history of isolation (160 Myr) has generated a high level of endemism at different taxonomic levels, making Madagascar one of the hotspots of global biodiversity. Dung beetles, represented by the two tribes of Canthonini and Helictopleurini, exemplify a large insect taxon. Helictopleurini are completely endemic to Madagascar while Canthonini are endemic at generic level. Using data from mitochondrial and nuclear genes, phylogenetic relationships were investigated in a sample of 44 species. The phylogeny for Canthonini consists of several distinct clades, possibly reflecting multiple colonization of Madagascar. The phylogeny does not support the current taxonomy for all genera. The phylogeny for Helictopleurini lacks statistical support at supra-specific level, and genetic divergence among the Helictopleurini species is comparable with that among species within genera in Canthonini. These results suggest that Helictopleurini has undergone rapid speciation and most likely more recently than Canthonini, consistent with the estimated radiation time based on mtDNA mutation rates in insects and with knowledge about the systematics and geographic distribution of dung beetles worldwide. A detailed analysis of sequence composition identified common patterns in Malagasy dung beetles and other insects. (c) The Willi Hennig Society 2007.