Colonize, radiate, decline: Unraveling the dynamics of island community assembly with Fijian trap‐jaw ants
Colonize, radiate, decline: Unraveling the dynamics of island community assembly with Fijian trap‐jaw ants
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DOI：
10.1111/evo.13983
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发表时间：
2020-04
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通讯作者：
Cong Liu;Eli M. Sarnat;Nicholas R. Friedman;Francisco Hita Garcia;C. Darwell;D. Booher;Y. Kubota;Alexander S. Mikheyev;E. Economo
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文献类型：
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作者：
Cong Liu;Eli M. Sarnat;Nicholas R. Friedman;Francisco Hita Garcia;C. Darwell;D. Booher;Y. Kubota;Alexander S. Mikheyev;E. Economo
对岛屿群落集合的研究是发展和检验生态学和进化理论的肥沃土壤。殖民化后谱系的生态进化轨迹一直是一个特别的兴趣，因为这是理解社区组装的关键组成部分。在这个系统中，现有的想法，如分类单元周期，认为谱系通过一个有规律的序列的生态进化的变化后，殖民化，与谱系转向减少扩散能力，增加生态专业化，并在丰富度下降。然而，这些预测在历史上一直难以检验。在这里，我们整合了昆虫基因组学，人口基因组学和X射线显微断层扫描/三维形态测量学，以测试假设是否生态形态多样性的陷阱颚蚂蚁（Strumigenys）在斐济群岛组装主要是通过殖民或殖民后辐射，以及物种是否表现出生态向生态位专业化，向高地栖息地，并在殖民后丰度下降。我们推断，大多数斐济地方性Strumigenys从一个单一的殖民地在原地发展，并多样化，以填补属所占的全球形态空间的很大一部分。在这种适应性的辐射，血统的趋势在不同程度上对高海拔，降低扩散能力，和人口下降，我们没有发现重复的殖民取代初始辐射的证据。总的来说，这些结果只是部分符合分类周期和相关的想法，同时突出的潜在作用，在组装岛屿社区的优先效应。
The study of island community assembly has been fertile ground for developing and testing theoretical ideas in ecology and evolution. The ecoevolutionary trajectory of lineages after colonization has been a particular interest, as this is a key component of understanding community assembly. In this system, existing ideas, such as the taxon cycle, posit that lineages pass through a regular sequence of ecoevolutionary changes after colonization, with lineages shifting toward reduced dispersal ability, increased ecological specialization, and declines in abundance. However, these predictions have historically been difficult to test. Here, we integrate phylogenomics, population genomics, and X‐ray microtomography/3D morphometrics, to test hypotheses for whether the ecomorphological diversity of trap‐jaw ants (Strumigenys) in the Fijian archipelago is assembled primarily through colonization or postcolonization radiation, and whether species show ecological shifts toward niche specialization, toward upland habitats, and decline in abundance after colonization. We infer that most Fijian endemic Strumigenys evolved in situ from a single colonization and have diversified to fill a large fraction of global morphospace occupied by the genus. Within this adaptive radiation, lineages trend to different degrees toward high elevation, reduced dispersal ability, and demographic decline, and we find no evidence of repeated colonization that displaces the initial radiation. Overall these results are only partially consistent with taxon cycle and associated ideas, while highlighting the potential role of priority effects in assembling island communities.