[en] Epiphytic communities offer an original framework to disentangle the contributions of environmental filters, biotic interactions and dispersal limitations to community structure at fine spatial scales. We determine here whether variations in light, microclimatic conditions and host tree size affect the variation in species composition and phylogenetic structure of epiphytic bryophyte communities, and hence, assess the contribution of environmental filtering, phylogenetic constraints and competition to community assembly. A canopy crane giving access to 1.1 ha of tropical rainforest in Yunnan (China) was employed to record hourly light and microclimatic conditions from 54 dataloggers and epiphytic bryophyte communities from 408 plots. Generalized Dissimilarity Modelling was implemented to analyse the relationship between taxonomic and phylogenetic turnover among epiphytic communities, host-tree characteristics and microclimatic variation. Within-tree vertical turnover of bryophyte communities was significantly about 30% higher than horizontal turnover among-trees. Thus, the sharp vertical variations in microclimatic conditions from tree base to canopy are more important than differences in age, reflecting the likelihood of colonization, area, and habitat conditions between young and old trees, in shaping the composition of epiphytic bryophyte communities. Our models, to which microclimatic factors contributed most (83–98%), accounted for 33% and 18% of the variation in vertical turnover in mosses and liverworts, respectively. Phylogenetic turnover shifted from significantly negative or non-significant within communities to significantly positive among communities, and was slightly, but significantly, correlated with microclimatic variation. These patterns highlight the crucial role of microclimates in determining the composition and phylogenetic structure of epiphytic communities. Synthesis. The mostly non-significant phylogenetic turnover observed within communities does not support the idea that competition plays an important role in epiphytic bryophytes. Instead, microclimatic variation is the main driver of community composition and phylogenetic structure, evidencing the role of phylogenetic niche conservatism in community assembly.
Disciplines :
Environmental sciences & ecology
Author, co-author :
Shen, Ting ; Université de Liège - ULiège > Integrative Biological Sciences (InBioS) ; CAS Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, China ; Center for Integrative Conservation, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, China
Corlett, Richard T. ; Center for Integrative Conservation, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, China
Collart, Flavien ; Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Biologie de l'évolution et de la conservation - Unité aCREA-Ulg (Conseils et Recherches en Ecologie Appliquée) ; Department of Ecology and Evolution (DEE), University of Lausanne, Lausanne, Switzerland
Guo, Xin-Lei ; Aba Academy of Ecological Protection and Development, Wenchuan, China ; State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, China
Patiño, Jairo ; Island Ecology and Evolution Research Group, Instituto de Productos Naturales & Agrobiología (IPNA) – Consejo Superior de Investigaciones Científicas (CSIC), La Laguna, Spain ; Department of Botany, Ecology and Plant Physiology, University of La Laguna, La Laguna, Tenerife, Spain
Su, Yang ; UMR ECOSYS, INRAE AgroParisTech, Université Paris-Saclay, Thiverval-Grignon, France
Hardy, Olivier J. ; Evolutionary Biology and Ecology Unit CP 160/12, Faculté des Sciences, Université Libre de Bruxelles, Brussels, Belgium
Ma, Wen-Zhang ; Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
Wang, Jian; Bryology Laboratory, School of Life Science, East China Normal University, Shanghai, China
Wei, Yu-Mei; Guangxi Key Laboratory of Plant Conservation and Restoration Ecology in Karst Terrain, Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guilin, China
Li, Yuan; CAS Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, China ; School of Ecology and Environment, Hainan University, Haikou, China
Song, Liang ; CAS Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, China ; Center of Plant Ecology, Core Botanical Gardens, Chinese Academy of Sciences, Menglun, China
Vanderpoorten, Alain ; Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Biologie de l'évolution et de la conservation - Unité aCREA-Ulg (Conseils et Recherches en Ecologie Appliquée)
CSC - China Scholarship Council [CN] FWB - Fédération Wallonie-Bruxelles [BE] F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE] NSCF - National Natural Science Foundation of China [CN] Natural Science Foundation of Yunnan Province Fundación BBVA
Funding text :
We thank Wen Yang for assistance with designing charts, Hai‐Long Zhang and Jin‐Long Dong for their assistance with field work, Simon Ferrier for assistance with the GDM model and the Xishuangbanna Tropical Rainforest Ecosystem Station (XTRES) of Chinese Ecosystem Research Network (CERN) and Sino BON‐Forest Canopy Biodiversity Monitoring Network for providing environmental data. This study was funded by the National Natural Science Foundation of China (32171529), the Natural Science Foundation of Yunnan Province (202101AT070059), the CAS “Light of West China” Program, the CAS 135 program (No. 2017XTBG‐F03, 2017XTBG‐F01), the candidates of the Young and Middle‐Aged Academic Leaders of Yunnan Province (2019HB040), and the Yunnan High Level Talents Special Support Plan (YNWR‐QNBJ‐2020‐066). T.S. is funded by China Scholarship Council (No. 201904910636). J.P. is funded by the Ministerio de Ciencia e Innovación (MICINN) through the Ramón y Cajal program (RYC‐2016‐20506) and the grant (ASTERALIEN ‐ PID2019‐110538GA‐I00) and by the Fundación BBVA (INVASION ‐ PR19_ECO_0046). O.H. and A.V. are research directors of the Belgian Funds for Scientific Research (FRS‐FNRS). Computational resources were provided by the Fédération Wallonie‐Bruxelles (Tier‐1; funded by Walloon Region, grant no. 1117545), and the Consortium des Équipements de Calcul Intensif (CÉCI; funded by the F.R.S.‐FNRS, grant no. 2.5020.11).
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