Trophic interactions are key to understanding the effects of global change on the distribution and functional role of the brown bear

Lucas, Pablo M. (author), De Barba, Marta (author), Skrbinšek, Tomaž (author), Jerina, Klemen (author)

Biotic interactions are expected to influence species' responses to global changes, but they are rarely considered across broad spatial extents. Abiotic factors are thought to operate at larger spatial scales, while biotic factors, such as species interactions, are considered more important at local scales within communities, in part because of the knowledge gap on species interactions at large spatial scales (i.e., the Eltonian shortfall). We assessed, at a continental scale, (i) the importance of biotic interactions, through food webs, on species distributions, and (ii) how biotic interactions under scenarios of climate and land-use change may affect the distribution of the brown bear (Ursus arctos). We built a highly detailed, spatially dynamic, and empirically sampled food web based on the energy contribution of 276 brown bear food species from different taxa (plants, vertebrates, and invertebrates) and their ensemble habitat models at high resolution across Europe. Then, combining energy contribution and predicted habitat of food species, we modelled energy contribution across space and included these layers within Bayesian-based models of the brown bear distribution in Europe. The inclusion of biotic interactions considerably improved our understanding of brown bear distribution at large (continental) scales compared with Bayesian models including only abiotic factors (climate and land use). Predicted future range shifts, which included changes in the distribution of food species, varied greatly when considering various scenarios of change in biotic factors, providing a warning that future indirect climate and land-use change are likely to have strong but highly uncertain impacts on species biogeography. Our study confirmed that advancing our understanding of ecological networks of species interactions will improve future projections of biodiversity change, especially for modelling species distributions and their functional role under climate and land-use change scenarios, which is key for effective conservation of biodiversity and ecosystem services.

• Language: English
• Keywords: climate change, community, ecosystem, food web, habitat, human impact, land use, predator–prey, species distribution mode, Ursus arctos
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: BF - Biotechnical Faculty
• Publication status: Published
• Publication version: Version of Record
• Year: 2025
• Number of pages: 20 str.
• Numbering: Vol. 31, iss. 6, article no. e70252
• PID: 20.500.12556/RUL-170993
• UDC: 574.4:599.744.211
• ISSN on article: 1365-2486
• DOI: 10.1111/gcb.70252
• COBISS.SI-ID: 243165443

Note

V članku je navedenih še več virov financiranja.

• Publication date in RUL: 25.07.2025

Record is a part of a journal

• Title: Global change biology
• Shortened title: Glob. chang. biol.
• Publisher: Blackwell Science
• ISSN: 1365-2486
• COBISS.SI-ID: 517722393

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

• Language: Slovenian
• Keywords: podnebne spremembe, združbe, ekosistem, prehranjevalni splet, življenjsko okolje, vpliv človeka, raba zemljišč, plenilec–plen, model razširjenosti vrst, rjavi medved