Multiple introductions and environmental factors affecting the establishment of invasive species on a volcanic island
Multiple introductions and environmental factors affecting the establishment of invasive species on a volcanic island
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DOI：
10.1016/j.soilbio.2015.02.031
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发表时间：
2015-06-01
影响因子：
9.7
通讯作者：
Kille, P.
中科院分区：
文献类型：
--
作者：
Novo, M.;Cunha, L.;Kille, P.
入侵物种对当地生物多样性和生态系统功能构成了重大挑战，特别是在岛屿上。了解影响入侵物种建立的因素以及这些因素与它们的遗传背景的关系，对于提高我们管理生物入侵的能力至关重要。本文对亚速尔群岛（葡萄牙）圣米格尔岛（Sao Miguel Island）的38个地点的两种世界性的亚洲巨球类蚯蚓（Amynthas gracilis和Amynthas corticis）进行了系统地理学研究。来自中国大陆、台湾、马来西亚以及美国、墨西哥、巴西和西班牙的“异常”种群的样本也被包括在内，结果共有565条蚯蚓在线粒体细胞色素氧化酶I （COI）和16S核糖体RNA基因上进行了基因分型。对土壤的元素组成、持水量、有机质含量、质地和pH值进行了表征，并记录了一些生境特征。两种植物在圣米格尔的分布范围均较广，丰度呈负相关，表明存在空间隔离/竞争，单性生殖的皮质沙蚕相对更成功。每个物种都有多个线粒体谱系，其中一个只在亚速尔群岛发现，这表明它们有一个复杂的入侵历史。环境因素影响了不同谱系的建立，金属浓度、地形海拔和人类影响程度与它们的丰度有不同的联系。谱系多样性与金属浓度呈负相关。这些结果强调了对入侵物种进行遗传表征以更好地了解其入侵模式的重要性。(C) 2015年作者。Elsevier Ltd.出版。
Invasive species pose significant challenges to local biodiversity and ecosystem function, especially on islands. Understanding the factors affecting the establishment of invasive species and how these relate to their genetic background is crucial to improve our ability to manage biological invasions. Here, we performed a phylogeographic study of two cosmopolitan megascolecid earthworms of Asian origin: Amynthas gracilis and Amynthas corticis at 38 localities on Sao Miguel Island in the Azores archipelago (Portugal). Samples from putative source populations in China, Taiwan, Malaysia, as well as 'outlier' populations in USA, Mexico, Brazil and Spain were also included, resulting in a total of 565 earthworms genotyped at the mitochondrial cytochrome oxidase I (COI) and 16S ribosomal RNA genes. Soils were characterised for elemental composition, water holding capacity, organic matter content, texture and pH, and some habitat features were recorded. Both species showed a wide distribution across Sao Miguel and their abundances were negatively associated, suggesting spatial segregation/competition, with the parthenogenetic A. corticis being relatively more successful. The presence of multiple mitochondrial lineages within each species, one of them found exclusively in the Azores, suggests a complex invasion history. Environmental factors affected the establishment of the different lineages, with metal concentrations, topographical elevation and the degree of human influence being differently linked to their abundances. Lineage diversity was negatively correlated with metal concentrations. These results emphasise the importance of genetically characterising invasive species to better understand their invasion patterns. (C) 2015 The Authors. Published by Elsevier Ltd.