The rising threat of climate change for arthropods from Earth’s cold regions: Taxonomic rather than native status drives species sensitivity

• Published in: Global Change Biology
• Main Authors: Renault, D., Leclerc, C., Colleu, M.A., Boutet, A., Hotte, H., Colinet, H., Chown, S., Convey, P.
• Other Authors: Université de Rennes (UR), Ecosystèmes, biodiversité, évolution Rennes (ECOBIO), Université de Rennes (UR)-Institut Ecologie et Environnement - CNRS Ecologie et Environnement (INEE-CNRS), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR), Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Centre National de la Recherche Scientifique (CNRS), Risques, Ecosystèmes, Vulnérabilité, Environnement, Résilience (RECOVER), Aix Marseille Université (AMU)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Unité de Nématologie (LSV Rennes), Laboratoire de la santé des végétaux (LSV), Agence nationale de sécurité sanitaire de l'alimentation, de l'environnement et du travail (ANSES)-Agence nationale de sécurité sanitaire de l'alimentation, de l'environnement et du travail (ANSES), Centre National de la Recherche Scientifique (CNRS), Université de Rennes - Faculté des sciences pharmaceutiques et biologiques (UR Pharmacie), Monash University Melbourne, British Antarctic Survey (BAS), Natural Environment Research Council (NERC), University of Johannesburg South Africa (UJ), Institut Polaire Français Paul Emile Victor. Grant Number: Projet IPEV 136 Subanteco, InEE-CNRS. Project ‘Long-term research on biodiversity in Antarctic and sub-Antarctic ecosystems’, Peter Convey is supported by NERC core funding to the BAS ‘Biodiversity, Evolution and Adaptation’ Team, Steven Chown is supported by ARC SRIEAS Grant SR200100005, ANR-20-EBI5-0004,ASICS,ASsessing and mitigating the effects of climate change and biological Invasions on the spatial redistribution of biodiversity in Cold environmentS(2020)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2022
• Subjects: arachnid; Araneae; Coleoptera; Diptera; heat exposure; insect; sub-Antarctic islands; temperature; thermal fluctuations; warming; ZABR; MESH: Arthropods; MESH: Climate Change; MESH: Ecosystem; MESH: Invertebrates; MESH: Biodiversity; [SDE.BE]Environmental Sciences/Biodiversity and Ecology; Arctic; Antarctic; Myro; Antarc*; Climate change
• Online Access: https://univ-rennes.hal.science/hal-03735798; https://univ-rennes.hal.science/hal-03735798v1/document; https://univ-rennes.hal.science/hal-03735798v1/file/Renault%20-%20The%20rising%20threat%20of%20climate%20change%20for%20arthropods%20from%20Earth%20s%20cold%20regions%20.pdf; https://doi.org/10.1111/gcb.16338

The R scripts and data are available at: https://doi.org/10.5281/zenodo.6809341 International audience Polar and alpine regions are changing rapidly with global climate change. Yet, the impacts on biodiversity, especially on the invertebrate ectotherms which are dominant in these areas, remain poorly understood. Short-term extreme temperature events, which are growing in frequency, are expected to have profound impacts on high-latitude ectotherms, with native species being less resilient than their alien counterparts. Here, we examined in the laboratory the effects of short periodic exposures to thermal extremes on survival responses of seven native and two non-native invertebrates from the sub-Antarctic Islands. We found that survival of dipterans was significantly reduced under warming exposures, on average having median lethal times (LT50) of about 30 days in control conditions, which declined to about 20 days when exposed to daily short-term maxima of 24°C. Conversely, coleopterans were either not, or were less, affected by the climatic scenarios applied, with predicted LT50 as high as 65 days under the warmest condition (daily exposures at 28°C for 2 h). The native spider Myro kerguelensis was characterized by an intermediate sensitivity when subjected to short-term daily heat maxima. Our results unexpectedly revealed a taxonomic influence, with physiological sensitivity to heat differing between higher level taxa, but not between native and non-native species representing the same higher taxon. The survival of a non-native carabid beetle under the experimentally imposed conditions was very high, but similar to that of native beetles, while native and non-native flies also exhibited very similar sensitivity to warming. As dipterans are a major element of diversity of sub-Antarctic, Arctic and other cold ecosystems, such observations suggest that the increased occurrence of extreme, short-term, thermal events could lead to large-scale restructuring of key terrestrial ecosystem components both in ...