J Plant Ecol ›› 2019, Vol. 12 ›› Issue (2): 314-326.DOI: 10.1093/jpe/rty026

• Research Articles • Previous Articles     Next Articles

Contrasting effects of space and environment on functional and phylogenetic dissimilarity in a tropical forest

Mengesha Asefa1, Calum Brown2, Min Cao1, Guocheng Zhang1, Xiuqin Ci1, Liqing Sha1, Jie Li1, Luxiang Lin1 and Jie Yang1,*   

  1. 1 Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, 666303 Yunnan, China
    2 Karlsruhe Institute of Technology, Institute of Meteorology and Climate Research, Atmospheric Environmental Research (IMK-IFU), Kreuzeckbahnstraße 19, 82467 Garmisch-Partenkirchen, Germany
    *Correspondence address. Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, 666303 Yunnan, China. Tel: +86-183-871-56270; Fax: +86-871-5160-916; E-mail: yangjie@xtbg.org.cn
  • Received:2018-03-02 Revised:2018-06-27 Accepted:2018-07-19 Online:2018-07-20 Published:2019-04-01

Abstract:

Aims

The evolutionary history and functional traits of species can illuminate ecological processes supporting coexistence in diverse forest communities. However, little has been done in decoupling the relative importance of these mechanisms on the turnover of phylogenetic and functional characteristics across life stages and spatial scales. Therefore, this study aims to estimate the contribution of environment and dispersal on the turnover of phylogenetic and functional diversity across life stages and spatial scales, in order to build a coherent picture of the processes responsible for species coexistence.

Methods

We conducted the study in Xishuangbanna Forest Dynamics Plot in Yunnan Province, southwest China. We used four different spatial point process models to estimate the relative importance of dispersal limitation and environmental filtering. The functional traits and phylogenetic relationships of all individual trees were incorporated in the analyses to generate measures of dissimilarity in terms of pairwise and nearest-neighbor phylogenetic and functional characteristics across life stages and spatial scales.

Important Findings

We found non-random patterns of phylogenetic and functional turnover across life stages and spatial scales. Environmental filtering structured pairwise phylogenetic and functional beta diversity across spatial scales, while dispersal limitation alone, and in combination with environment filtering, shaped nearest neighbor phylogenetic and functional beta diversity. The relative importance of dispersal limitation and environmental filtering appeared to change with life stage but not with spatial scale. Our findings suggest that phylogenetic and functional beta diversity help to reveal the ecological processes responsible for evolutionary and functional assembly and highlight the importance of using a range of different metrics to gain full insights into these processes.

Key words: community assembly, functional beta diversity, life stage, phylogenetic beta diversity, spatial point pattern