Title: A model-based approach to studying changes in compositional heterogeneity
Authors: Baeten, Lander ×
Warton, David I.
Van Calster, Hans
De Frenne, Pieter
Verstraeten, Gorik
Bonte, Dries
Bernhardt-Romermann, Markus
Cornelis, Johnny
Decocq, Guillaume
Eriksson, Ove
Hedl, Radim
Heinken, Thilo
Hermy, Martin
Hommel, Patrick
Kirby, Keith
Naaf, Tobias
Petrik, Petr
Walther, Gian-Reto
Wulf, Monica
Verheyen, Kris #
Issue Date: 2014
Series Title: Methods in Ecology and Evolution vol:5 issue:2 pages:156-164
Abstract: 1. Non-random species loss and gain in local communities change the compositional heterogeneity between communities over time, which is traditionally quantified with dissimilarity-based approaches. Yet, dissimilaritis summarize the multivariate species data into a univariate index and obscure the species-level patterns of change, which are central to understand the causes an d consequences of the community ch anges.
2. Here, we propose a model-b ased approach that looks for species-level effects of time period and construct a multiple-site metric as a sum across species to test the consistency of the individual species responses. Species f all into different response type s, showing how they in fluence the changes in community heterogeneity.
3. In a comparison with other multiple-site metrics, we illustrate the properties of our method and the difference sand similarities with other approaches. For instance, our metric estimates the total variation in a community dataset based on species-level contributions, not the compositional dissimilarities between particular sites. Similar to some other approaches, we can distinguish between heterogeneity derived from turnover or richness differences.
4. Our approach was applied to a set of 23 forest understorey resurvey studies spread across Europe. We show the species gains a nd losses m ay as well decrease or increase levels of community heterogeneity. Although species occurrences and communities have not changed in a consistent way along continental-scale environmental gradients such as climatic conditions, several species shifted in a similar way across the different data sets.
5. Testing the significance of shifts in species prevalence over time to infer corresponding changes in the compositional heterogeneity among sites provides a very intuitive tool for community resurvey studies. The main strengths of our framework are the explicit consideration of the relative roles of species gains and losses and the straight forward generalization to different sets of hypotheses r elated to community changes.
ISSN: 2041-210X
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Division Forest, Nature and Landscape Research
× corresponding author
# (joint) last author

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