Temporal coexistence mechanisms contribute to the latitudinal gradient in forest diversity

Jacob Usinowicz, Chia Hao Chang-Yang, Yu Yun Chen, James S. Clark, Christine Fletcher, Nancy C. Garwood, Zhanqing Hao, Jill Johnstone, Yiching Lin, Margaret R. Metz, Takashi Masaki, Tohru Nakashizuka, I. Fang Sun, Renato Valencia, Yunyun Wang, Jess K. Zimmerman, Anthony R. Ives, S. Joseph Wright

    研究成果: Article査読

    49 被引用数 (Scopus)

    抄録

    The tropical forests of Borneo and Amazonia may each contain more tree species diversity in half a square kilometre than do all the temperate forests of Europe, North America, and Asia combined1. Biologists have long been fascinated by this disparity, using it to investigate potential drivers of biodiversity2. Latitudinal variation in many of these drivers is expected to create geographic differences in ecological2-4 and evolutionary processes4,5, and evidence increasingly shows that tropical ecosystems have higher rates of diversification, clade origination, and clade dispersal5,6. However, there is currently no evidence to link gradients in ecological processes within communities at a local scale directly to the geographic gradient in biodiversity. Here, we show geographic variation in the storage effect, an ecological mechanism that reduces the potential for competitive exclusion more strongly in the tropics than it does in temperate and boreal zones, decreasing the ratio of interspecific-to-intraspecific competition by 0.25% for each degree of latitude that an ecosystem is located closer to the Equator. Additionally, we find evidence that latitudinal variation in climate underpins these differences; longer growing seasons in the tropics reduce constraints on the seasonal timing of reproduction, permitting lower recruitment synchrony between species and thereby enhancing niche partitioning through the storage effect. Our results demonstrate that the strength of the storage effect, and therefore its impact on diversity within communities, varies latitudinally in association with climate. This finding highlights the importance of biotic interactions in shaping geographic diversity patterns, and emphasizes the need to understand the mechanisms underpinning ecological processes in greater detail than has previously been appreciated.

    本文言語English
    ページ(範囲)105-108
    ページ数4
    ジャーナルNature
    550
    7674
    DOI
    出版ステータスPublished - 2017 10 5

    ASJC Scopus subject areas

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