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Molecular assessment of dietary niche partitioning in an endemic island radiation of tropical mammals
Molecular Ecology ( IF 4.5 ) Pub Date : 2021-08-30 , DOI: 10.1111/mec.16158
Anna L Petrosky 1, 2 , Dakota M Rowsey 1 , Lawrence R Heaney 1
Affiliation  

Island radiations represent unique evolutionary histories in unique ecological contexts. These radiations provide opportunities to investigate ecological diversification in groups that typically exhibit niche partitioning among their constituents, including partitioning of food resources. DNA metabarcoding produces finer levels of diet identification than traditional methods, allowing us to examine dietary niche partitioning in communities or clades in which species share superficially similar diets. Here, we use DNA metabarcoding to investigate dietary niche partitioning in an endemic radiation of mammals in the Philippines. Our data reveal niche partitioning as well as phylogenetically-uncorrelated adaptive evolution in this small mammal community. Because 70% of the focal species belong to the tribe Chrotomyini, an endemic Philippine radiation of murid rodents that feed extensively on earthworms, this study sheds light on dietary adaptation and its role in the co-occurrence of closely related species. Our results reveal fine-scale resource partitioning within this community; our data provide compelling evidence for niche partitioning of diet that was masked by previous diet categories and will help in further dissecting the model adaptive radiation of endemic small mammals on Luzon. This study reinforces the notion that DNA metabarcoding can be a valuable tool for investigating both ecological relationships and evolutionary ecology at the community and phylogenetic level, respectively.

中文翻译:

热带哺乳动物地方性岛屿辐射饮食生态位分配的分子评估

岛屿辐射代表了独特生态环境中独特的进化历史。这些辐射提供了研究群体生态多样化的机会,这些群体通常表现出其成分之间的生态位划分,包括食物资源的划分。与传统方法相比,DNA 元条形码产生了更高水平的饮食识别,使我们能够检查物种共享表面相似饮食的群落或进化枝中的饮食生态位划分。在这里,我们使用 DNA 元条形码来研究菲律宾哺乳动物地方性辐射中的饮食生态位分配。我们的数据揭示了这个小型哺乳动物群落的生态位划分以及系统发育不相关的适应性进化。因为 70% 的重点物种属于 Chrotomyini 部落,这项研究揭示了饮食适应及其在密切相关物种共存中的作用 我们的结果揭示了该社区内的精细资源划分;我们的数据为以前饮食类别掩盖的饮食细分提供了令人信服的证据,并将有助于进一步剖析吕宋岛地方性小型哺乳动物的模型适应性辐射。这项研究强化了这样一种观念,即 DNA 元条形码可以成为分别在群落和系统发育水平上研究生态关系和进化生态学的宝贵工具。我们的结果揭示了该社区内的精细资源划分;我们的数据为以前饮食类别掩盖的饮食细分提供了令人信服的证据,并将有助于进一步剖析吕宋岛地方性小型哺乳动物的模型适应性辐射。这项研究强化了这样一种观念,即 DNA 元条形码可以成为分别在群落和系统发育水平上研究生态关系和进化生态学的宝贵工具。我们的结果揭示了该社区内的精细资源划分;我们的数据为以前饮食类别掩盖的饮食细分提供了令人信服的证据,并将有助于进一步剖析吕宋岛地方性小型哺乳动物的模型适应性辐射。这项研究强化了这样一种观念,即 DNA 元条形码可以成为分别在群落和系统发育水平上研究生态关系和进化生态学的宝贵工具。
更新日期:2021-08-30
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