Conservation implications of spatial genetic structure in two species of oribatid mites from the Antarctic Peninsula and the Scotia Arc
Conservation implications of spatial genetic structure in two species of oribatid mites from the Antarctic Peninsula and the Scotia Arc
复制标题
南极半岛和斯科舍岛弧两种甲螨空间遗传结构的保护意义
作者：
B. V. van Vuuren;Jennifer E. Lee;P. Convey;S. Chown
摘要本文利用两种南极短尾类螨类--贝氏嗜盐线虫和南极丝足螨的线粒体和核序列数据，研究了南极半岛地区生物多样性演化及其未来保护的三个关键问题：1)南极半岛和Scotia Arc地区的螨类种群是否构成不同的遗传谱系？2)这些物种的空间遗传结构对目前对该地区冰川历史的理解有什么影响？Iii)这些发现对环境保护有何影响？我们的结果表明，至少从上新世开始，这两种螨类就一直存在于南极。在区域尺度上，这两个物种都由一些不同但共处的谱系组成，这些谱系在遗传上与盐生动物属和阿拉斯考兹动物属中的一些物种一样截然不同。在局部尺度上，复杂的结构表明后全新世的扩散是有限的和随机的。这两个物种在整个地区都存在相当大的空间遗传结构，类似于在其他陆地无脊椎动物中发现的结构。这些结果支持在斯科舍弧形群岛和南极半岛之间以及在整个南极半岛之间实施严格的生物安全措施，以保存进化历史和未来的进化轨迹。
Abstract Mitochondrial and nuclear sequence data from two Antarctic ameronothroid mites, Halozetes belgicae and Alaskozetes antarcticus, were used to address three key questions important for understanding both the evolution of biodiversity and its future conservation in the Antarctic Peninsula Region: i) Do populations of mites across the Antarctic Peninsula and Scotia Arc constitute distinct genetic lineages? ii) What implications does the spatial genetic structure in these species have for current understanding of the region’s glacial history? iii) What are the conservation implications of these findings? Our results indicate that both mite species have been present in the Antarctic since at least the Pliocene. At the regional scale, both species are comprised of a number of divergent, but sympatric, lineages that are genetically as distinct as some species within the genera Halozetes and Alaskozetes. At the local scale, complex structure suggests limited and stochastic post-Holocene dispersal. For both species, considerable spatial genetic structure exists across the region, similar to that found in other terrestrial invertebrates. These results support the implementation of stringent biosecurity measures for moving between the Scotia Arc islands and the Antarctic Peninsula, and throughout the latter, to conserve both evolutionary history and future evolutionary trajectories.
DOI：
10.1007/978-90-481-8716-4
发表时间：
2010
期刊：
--
影响因子：
--
作者：
J. Dodson
通讯作者：
J. Dodson