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Underdispersion and overdispersion of traits in terrestrial snail communities on islands

Astor, Tina and Strengbom, Joachim and Berg, Matty P and Lenoir, Lisette and Marteinsdóttir, Bryndís and Bengtsson, Jan (2014). Underdispersion and overdispersion of traits in terrestrial snail communities on islands. Ecology and evolution. 4:11, 2090-2102
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Official URL: http://dx.doi.org/10.1002/ece3.1084

Abstract

Understanding and disentangling different processes underlying the assembly and diversity of communities remains a key challenge in ecology. Species can assemble into communities either randomly or due to deterministic processes. Deterministic assembly leads to species being more similar (underdispersed) or more different (overdispersed) in certain traits than would be expected by chance. However, the relative importance of those processes is not well understood for many organisms, including terrestrial invertebrates. Based on knowledge of a broad range of species traits, we tested for the presence of trait underdispersion (indicating dispersal or environmental filtering) and trait overdispersion (indicating niche partitioning) and their relative importance in explaining land snail community composition on lake islands. The analysis of community assembly was performed using a functional diversity index (Rao’s quadratic entropy) in combination with a null model approach. Regression analysis with the effect sizes of the assembly tests and environmental variables gave information on the strength of under- and overdispersion along environmental gradients. Additionally, we examined the link between community weighted mean trait values and environmental variables using a CWM-RDA. We found both trait underdispersion and trait overdispersion, but underdispersion (eight traits) was more frequently detected than overdispersion (two traits). Underdispersion was related to four environmental variables (tree cover, habitat diversity, productivity of ground vegetation, and location on an esker ridge). Our results show clear evidence for underdispersion in traits driven by environmental filtering, but no clear evidence for dispersal filtering. We did not find evidence for overdispersion of traits due to diet or body size, but overdispersion in shell shape may indicate niche differentiation between snail species driven by small-scale habitat heterogeneity. The use of species traits enabled us to identify key traits involved in snail community assembly and to detect the simultaneous occurrence of trait underdispersion and overdispersion.

Authors/Creators:Astor, Tina and Strengbom, Joachim and Berg, Matty P and Lenoir, Lisette and Marteinsdóttir, Bryndís and Bengtsson, Jan
Title:Underdispersion and overdispersion of traits in terrestrial snail communities on islands
Series/Journal:Ecology and evolution (2045-7758)
Year of publishing :2014
Depositing date:16 January 2015
Volume:4
Number:11
Page range:2090-2102
Number of Pages:13
Publisher:John Wiley & Sons
ISSN:2045-7758
Language:English
Publication Type:Journal article
Refereed:Yes
Article category:Scientific peer reviewed
Version:Published version
Full Text Status:Public
Agris subject categories.:L Animal production > L20 Animal ecology
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
Agrovoc terms:communities, diversity, assembly, ecology, species, snails, environment, environmental factors
Keywords:communities, diversity, assembly, ecology, species, snails, underdispersion, overdispersion, environment
URN:NBN:urn:nbn:se:slu:epsilon-e-2308
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-2308
Additional ID:
Type of IDID
Web of Science (WoS)000337522200006
DOI10.1002/ece3.1084
ID Code:11715
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Ecology
(S) > Dept. of Ecology
Deposited By: SLUpub Connector
Deposited On:16 Jan 2015 15:38
Metadata Last Modified:25 Apr 2015 06:42

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