The effects of abiotic and biotic factors on taxonomic and phylogenetic diversity of stream epilithic bacteria around Qi
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Aquatic Sciences
RESEARCH ARTICLE
The effects of abiotic and biotic factors on taxonomic and phylogenetic diversity of stream epilithic bacteria around Qiandao Lake Mingjia Li1,2 · Jinfu Liu1,2 · Jonathan D. Tonkin3 · Ji Shen1 · Nengwen Xiao4 · Jianjun Wang1,2 Received: 15 January 2020 / Accepted: 18 July 2020 © Springer Nature Switzerland AG 2020
Abstract Stream bacterial communities are shaped by a combination of local and regional processes, such as environmental filtering, biotic interactions and dispersal, but biotic interactions have received comparatively less attention. Here, we investigated stream bacterial alpha and beta diversity within taxonomic and phylogenetic contexts around Qiandao Lake in China. We further examined abiotic and biotic factors on bacterial communities by explicitly considering biotic variables including macroinvertebrate species richness, total cover of periphyton and submerged macrophytes. For alpha and beta diversity, there were consistently high correlations between taxonomic and observed phylogenetic metrics. Taxonomic and phylogenetic diversity could be explained by abiotic and biotic variables, though the former showed a stronger influence. Using a null model to break down the association between species phylogeny and co-occurrence, we found non-significant correlations for alpha and beta diversity between taxonomic and phylogenetic diversity, that is, the standardized effect size of phylogenetic diversity (ses.PD) or Unifrac dissimilarity (ses.Unifrac). Variations in taxonomic and phylogenetic diversity at both alpha and beta levels were mainly explained by pure effect of abiotic variables. Biotic variables, such as macroinvertebrate species richness and total cover of periphyton, significantly explained the variations in ses.PD and ses.Unifrac by 19.4% and 18.9%, respectively. Our findings provide an evidence that biotic variables play a non-negligible role in structuring bacterial communities and help to better understand the potential role of biological interactions across trophic levels in streams. Keywords Stream · Biotic effects · Null model · Phylogenetic structure · Phylogenetic beta diversity · Bacteria
Introduction Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00027-020-00746-8) contains supplementary material, which is available to authorized users. * Nengwen Xiao [email protected] * Jianjun Wang [email protected] 1
State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
2
University of Chinese Academy of Science, Beijing 100049, China
3
School of Biological Sciences, University of Canterbury, Christchurch 8140, New Zealand
4
Chinese Research Academy of Environmental Sciences, Beijing 100021, China
A central question in biogeographical and ecological research is the relationship between local environmental factors and community distributions (Alfonso and Miguel 2008; Hill et al. 2001). Compared to s
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