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Decomposing drivers in avian insectivory: Large-scale effects of climate, habitat and bird diversity
Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.ORCID iD: 0000-0002-3550-1070
Number of Authors: 612024 (English)In: Journal of Biogeography, ISSN 0305-0270, E-ISSN 1365-2699, Vol. 51, no 6, p. 1079-1094Article in journal (Refereed) Published
Abstract [en]

Aim: Climate is a major driver of large-scale variability in biodiversity, as a likely result of more intense biotic interactions under warmer conditions. This idea fuelled decades of research on plant-herbivore interactions, but much less is known about higher-level trophic interactions. We addressed this research gap by characterizing both bird diversity and avian predation along a climatic gradient at the European scale.

Location: Europe.

Taxon: Insectivorous birds and pedunculate oaks.

Methods: We deployed plasticine caterpillars in 138 oak trees in 47 sites along a 19° latitudinal gradient in Europe to quantify bird insectivory through predation attempts. In addition, we used passive acoustic monitoring to (i) characterize the acoustic diversity of surrounding soundscapes; (ii) approximate bird abundance and activity through passive acoustic recordings; and (iii) infer both taxonomic and functional diversity of insectivorous birds from recordings.

Results: The functional diversity of insectivorous birds increased with warmer climates. Bird predation increased with forest cover and bird acoustic activity but decreased with mean annual temperature and functional richness of insectivorous birds. Contrary to our predictions, climatic clines in bird predation attempts were not directly mediated by changes in insectivorous bird diversity or acoustic activity, but climate and habitat still had independent effects on predation attempts.

Main Conclusions: Our study supports the hypothesis of an increase in the diversity of insectivorous birds towards warmer climates but refutes the idea that an increase in diversity would lead to more predation and advocates for better accounting for activity and abundance of insectivorous birds when studying the large-scale variation in insect-tree interactions.

Place, publisher, year, edition, pages
2024. Vol. 51, no 6, p. 1079-1094
Keywords [en]
acoustic diversity, climatic gradient, functional diversity, insectivorous birds, plasticine caterpillars, predation function
National Category
Ecology
Identifiers
URN: urn:nbn:se:su:diva-228906DOI: 10.1111/jbi.14808ISI: 001188157300001Scopus ID: 2-s2.0-85184698569OAI: oai:DiVA.org:su-228906DiVA, id: diva2:1855793
Available from: 2024-05-03 Created: 2024-05-03 Last updated: 2024-09-04Bibliographically approved

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Tack, Ayco J. M.

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