Soil temperature effects on the structure and diversity of plant and invertebrate communities in a natural warming experiment

• Published in: Journal of Animal Ecology
• Main Authors: Robinson, Sinikka I., Mclaughlin, Orla B., Marteinsdottir, Bryndis, O'Gorman, Eoin J.
• Other Authors: Department of Life Sciences, Imperial College London, Helsingin yliopisto = Helsingfors universitet = University of Helsinki, Agroécologie Dijon, Institut National de la Recherche Agronomique (INRA)-Université de Bourgogne (UB)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement-Université Bourgogne Franche-Comté COMUE (UBFC), Institute of Life and Environmental Sciences, University of Iceland, Soil Conservation Service, NERC NE/L011840/1, NE/M020843/1, British Ecological Society 4009-4884, SR16/1152, Royal Society RG140601, Finnish Cultural Foundation
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2018
• Subjects: Arctic; climate change; Hengill; invertebrate community; natural experiment; pitfall; soil temperature; vegetation; [SDE.BE]Environmental Sciences/Biodiversity and Ecology; Climate change; Global warming; Iceland
• Online Access: https://hal.inrae.fr/hal-02625664; https://hal.inrae.fr/hal-02625664/document; https://hal.inrae.fr/hal-02625664/file/2018_Robinson_Journal%20of%20Animal%20Ecology_1.pdf; https://doi.org/10.1111/1365-2656.12798

This article also appears in: Global Change - Virtual Issue https://besjournals.onlinelibrary.wiley.com/doi/toc/10.1111/(ISSN)1365-2656.Global_Change_EcologyJANE2018 International audience 1. Global warming is predicted to significantly alter species physiology, biotic interactions and thus ecosystem functioning, as a consequence of coexisting species exhibiting a wide range of thermal sensitivities. There is, however, a dearth of research examining warming impacts on natural communities. 2. Here, we used a natural warming experiment in Iceland to investigate the changes in above-ground terrestrial plant and invertebrate communities along a soil temperature gradient (10°C-30°C). 3. The α-diversity of plants and invertebrates decreased with increasing soil temperature, driven by decreasing plant species richness and increasing dominance of certain invertebrate species in warmer habitats. There was also greater species turnover in both plant and invertebrate communities with increasing pairwise temperature difference between sites. There was no effect of temperature on percentage cover of vegetation at the community level, driven by contrasting effects at the population level. 4. There was a reduction in the mean body mass and an increase in the total abundance of the invertebrate community, resulting in no overall change in community biomass. There were contrasting effects of temperature on the population abundance of various invertebrate species, which could be explained by differential thermal tolerances and metabolic requirements, or may have been mediated by changes in plant community composition. 5. Our study provides an important baseline from which the effect of changing environmental conditions on terrestrial communities can be tracked. It also contributes to our understanding of why community-level studies of warming impacts are imperative if we are to disentangle the contrasting thermal responses of individual populations.