Unraveling cryptic invasion of a freshwater snail in Chile based on molecular and morphological data

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• 作者：Gonzalo A. Collado
• 关键词：Cryptic species ; Cryptogenic species ; DNA barcode ; Gastropoda ; Phylogenetic analyses
• 刊名：Biodiversity and Conservation
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：26
• 期：3
• 页码：567-578
• 全文大小：
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Biodiversity; Ecology; Conservation Biology/Ecology; Climate Change/Climate Change Impacts;
• 出版者：Springer Netherlands
• ISSN：1572-9710
• 卷排序：26

文摘

Cryptic species may cause biological invasions to be overlooked leading to underestimation of the potential impacts of invaders on the new ecosystems. Identification of freshwater snails is challenging because of the scarcity of discriminative morphological characters and the limited taxonomic knowledge of some taxa. Here, molecular and morphological analyses were performed to investigate the identity of viable populations of the genus Physa in aquatic ecosystems of different basins in northern and central Chile, including habitats where the native species Physa chilensis and Physa nodulosa have been traditionally recognized. Molecular analyses based on mitochondrial DNA sequences from the small subunit 16S rDNA and cytochrome c oxidase subunit 1 identified all specimens sequenced as belonging to the globally invasive species Physa acuta. Microscopic examination of the radula and morphological observations of the reproductive system were congruent with these findings. Highly divergent haplotypes found in El Salto suggest multiple introductions of different lineages of the invader in this locality. It is clear that for future management planning a more reliable assessment of the status of P. chilensis and P. nodulosa is required.