Environmental filtering and taxonomic relatedness underlie the species richness-evenness relationship

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http://hdl.handle.net/10138/307234

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Passy , S I , Bottin , M , Soininen , J & Hillebrand , H 2017 , ' Environmental filtering and taxonomic relatedness underlie the species richness-evenness relationship ' , Hydrobiologia , vol. 787 , no. 1 , pp. 243-253 . https://doi.org/10.1007/s10750-016-2968-3

Title: Environmental filtering and taxonomic relatedness underlie the species richness-evenness relationship
Author: Passy, Sophia I.; Bottin, Marius; Soininen, Janne; Hillebrand, Helmut
Contributor: University of Helsinki, Department of Geosciences and Geography
Date: 2017-02
Language: eng
Number of pages: 11
Belongs to series: Hydrobiologia
ISSN: 0018-8158
URI: http://hdl.handle.net/10138/307234
Abstract: We examined the relationship between species richness (S) and evenness (J) within a novel, community assembly framework. We hypothesized that environmental stress leads to filtering (increasing the proportional abundance of tolerant species) and taxonomic dispersion (decreasing the number of species within genera and families). Environmental filtering would cause a decline in S by eliminating some stress-sensitive species and a reduction of J by allowing only tolerant species to maintain large populations. Taxonomic relatedness may influence both S and J by controlling the nature of interspecific interactions-positive under taxonomic dispersion versus negative under taxonomic clustering. Therefore, the S-J relationship may be a product of environmental filtering and taxonomic relatedness. We tested this framework with redundancy analyses and structural equation models using continental stream diatom and fish data. We confirmed that (i) environmental stress, defined by watershed forest cover, slope, and temperature, caused filtering (lower sensitive: tolerant species abundance ratios) and taxonomic dispersion (elevated genus: species richness and family: species richness ratios); (ii) S and J, which declined with filtering and taxonomic dispersion, exhibited a positive relationship; and (iii) the role of filtering on J was pronounced only under stressful conditions, while taxonomic dispersion remained an important predictor of J across stressful and favorable environments.
Subject: Community assembly
Competition
Complementarity
Functional groups
Limiting similarity
Stress gradient hypothesis
LIMITING SIMILARITY
COMPETITIVE-EXCLUSION
DIATOM COMMUNITIES
PHYLOGENETIC STRUCTURE
DISTURBANCE GRADIENTS
FISH COMMUNITIES
DIVERSITY
STRESS
BIODIVERSITY
PATTERNS
1172 Environmental sciences
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