Body size and trophic position determine the outcomes of species invasions along temperature and productivity gradients

Author:

Dijoux Samuel12ORCID,Pichon Noémie A.34ORCID,Sentis Arnaud5ORCID,Boukal David S.12ORCID

Affiliation:

1. Department of Ecosystems Biology, Faculty of Science University of South Bohemia České Budějovice Czech Republic

2. Czech Academy of Sciences, Biology Centre Institute of Entomology České Budějovice Czech Republic

3. Ecology and Genetics Unit, Faculty of Science University of Oulu Oulu Finland

4. Swiss Federal Research Institute WSL Birmensdorf Switzerland

5. INRAE, Aix Marseille University, UMR RECOVER Aix‐en‐Provence France

Abstract

AbstractSpecies invasions are predicted to increase in frequency with global change, but quantitative predictions of how environmental filters and species traits influence the success and consequences of invasions for local communities are lacking. Here we investigate how invaders alter the structure, diversity and stability regime of simple communities across environmental gradients (habitat productivity, temperature) and community size structure. We simulate all three‐species trophic modules (apparent and exploitative competition, trophic chain and intraguild predation). We predict that invasions most often succeed in warm and productive habitats and that successful invaders include smaller competitors, intraguild predators and comparatively small top predators. This suggests that species invasions and global change may facilitate the downsizing of food webs. Furthermore, we show that successful invasions leading to species substitutions rarely alter system stability, while invasions leading to increased diversity can destabilize or stabilize community dynamics depending on the environmental conditions and invader's trophic position.

Funder

Agence Nationale de la Recherche

Grantová Agentura České Republiky

Publisher

Wiley

Subject

Ecology, Evolution, Behavior and Systematics

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