Disentangling the roles of chance, abiotic factors and biotic interactions among epiphytic bryophyte communities in a tropical rainforest (Yunnan, China).
Competition; epiphytes; facilitation; life form; liverworts; mosses; niche preference; stress-gradient hypothesis; China; Trees; Rainforest; Bryophyta; Ecology, Evolution, Behavior and Systematics; Plant Science; General Medicine
Abstract :
[en] Epiphytes offer an appealing framework to disentangle the contributions of chance, biotic and abiotic drivers of species distributions. In the context of the stress-gradient theory, we test the hypotheses that (i) deterministic (i.e., non-random) factors play an increasing role in communities from young to old trees, (ii) negative biotic interactions increase on older trees and towards the tree base, and (iii) positive interactions show the reverse pattern. Bryophyte species distributions and abiotic conditions were recorded on a 1.1 ha tropical rainforest canopy crane site. We analysed co-occurrence patterns in a niche modelling framework to disentangle the roles of chance, abiotic factors and putative biotic interactions among species pairs. 76% of species pairs resulted from chance. Abiotic factors explained 78% of non-randomly associated species pairs, and co-occurrences prevailed over non-coincidences in the remaining species pairs. Positive and negative interactions mostly involved species pairs from the same versus different communities (mosses versus liverworts) and life forms, respectively. There was an increase in randomly associated pairs from large to small trees. No increase in negative interactions from young to old trees or from the canopy to the base was observed. Our results suggest that epiphytic bryophyte community composition is primarily driven by environmental filtering, whose importance increases with niche complexity and diversity. Biotic interactions play a secondary role, with a very marginal contribution of competitive exclusion. Biotic interactions vary among communities (mosses versus liverworts) and life forms, facilitation prevailing among species from the same community and life form, and competition among species from different communities and life forms.
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, Mengla, Menglun, China ; Center for Integrative Conservation, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, Mengla, Menglun, China ; Department of Ecology and Evolution (DEE), University of Lausanne, Lausanne, Switzerland ; Department of Economic Plants and Biotechnology, Yunnan Key Laboratory for Wild Plant Resources, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
Song, L; CAS Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla, Menglun, China
Corlett, R T; Center for Integrative Conservation, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, Mengla, Menglun, China
Guisan, A; Department of Ecology and Evolution (DEE), University of Lausanne, Lausanne, Switzerland ; Institute of Earth Surface Dynamics, University of Lausanne, Lausanne, Switzerland
Wang, J; Bryology Laboratory, School of Life Science, East China Normal University, Shanghai, China
Ma, W-Z; Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, 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)
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
✱ These authors have contributed equally to this work.
Language :
English
Title :
Disentangling the roles of chance, abiotic factors and biotic interactions among epiphytic bryophyte communities in a tropical rainforest (Yunnan, China).
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]
Funding text :
This study was funded by the National Natural Science Foundation of China (32171529) and the Natural Science Foundation of Yunnan Province (202101AT070059). T.S. is funded by China Scholarship Council (No. 201904910636). W.J. is funded by the National Natural Science Foundation of China (No. 32070228). A.V. is a research director 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).We thank the National Forest Ecosystem Research Station at Xishuangbanna and the Sino BON-Forest Canopy Biodiversity Monitoring Network for providing research platforms and environmental data.
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