Widespread shifts in body size within populations and assemblages

• 成果类型: Article
• 署名作者: Martins, Ines S.; Schrodt, Franziska; Blowes, Shane A.; Bates, Amanda E.; Bjorkman, Anne D.; Brambilla, Viviana; Carvajal-Quintero, Juan; Chow, Cher F. Y.; Daskalova, Gergana N.; Edwards, Kyle; Eisenhauer, Nico; Field, Richard; Fontrodona-Eslava, Ada; Henn, Jonathan J.; van Klink, Roel; Madin, Joshua S.; Magurran, Anne E.; McWilliam, Michael; Moyes, Faye; Pugh, Brittany; Sagouis, Alban; Trindade-Santos, Isaac; McGill, Brian J.; Chase, Jonathan M.; Dornelas, Maria
• 署名单位: University of St Andrews; University of York - UK; University of Nottingham; German Research Foundation (DFG); German Centre for Integrative Biodiversity Research (iDiv); Martin Luther University Halle Wittenberg; University of Victoria; University of Gothenburg; University of Gothenburg; Universidade de Lisboa; Leipzig University; International Institute for Applied Systems Analysis (IIASA); University of Hawaii System; University of Hawaii Manoa; University of California System; University of California Riverside; University of Colorado System; University of Colorado Boulder; University of Hawaii System; University of Hawaii Manoa; University of London; University College London; Okinawa Institute of Science & Technology Graduate University; University of Maine System; University of Maine Orono; University of Maine System; University of Maine Orono
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-8210
• DOI: 10.1126/science.adg6006
• 发表日期: 2023-09-08
• 页码: 1067-1071
• 关键词: temperate deciduous forest; bird community dynamics; long-term trends; biodiversity change; species composition; secondary forest; abundance; marine; density; climate

摘要

Biotic responses to global change include directional shifts in organismal traits. Body size, an integrative trait that determines demographic rates and ecosystem functions, is thought to be shrinking in the Anthropocene. Here, we assessed the prevalence of body size change in six taxon groups across 5025 assemblage time series spanning 1960 to 2020. Using the Price equation to partition this change into within-species body size versus compositional changes, we detected prevailing decreases in body size through time driven primarily by fish, with more variable patterns in other taxa. We found that change in assemblage composition contributes more to body size changes than within-species trends, but both components show substantial variation in magnitude and direction. The biomass of assemblages remains quite stable as decreases in body size trade off with increases in abundance.