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Hiding in the background: community-level patterns in invertebrate herbivory across the tundra biome
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2019 (English)In: Polar Biology, ISSN 0722-4060, E-ISSN 1432-2056, Vol. 42, no 10, p. 1881-1897Article in journal (Refereed) Published
Abstract [en]

Invertebrate herbivores depend on external temperature for growth and metabolism. Continued warming in tundra ecosystems is proposed to result in increased invertebrate herbivory. However, empirical data about how current levels of invertebrate herbivory vary across the Arctic is limited and generally restricted to a single host plant or a small group of species, so predicting future change remains challenging. We investigated large-scale patterns of invertebrate herbivory across the tundra biome at the community level and explored how these patterns are related to long-term climatic conditions and year-of-sampling weather, habitat characteristics, and aboveground biomass production. Utilizing a standardized protocol, we collected samples from 92 plots nested within 20 tundra sites during summer 2015. We estimated the community-weighted biomass lost based on the total leaf area consumed by invertebrates for the most common plant species within each plot. Overall, invertebrate herbivory was prevalent at low intensities across the tundra, with estimates averaging 0.94% and ranging between 0.02 and 5.69% of plant biomass. Our results suggest that mid-summer temperature influences the intensity of invertebrate herbivory at the community level, consistent with the hypothesis that climate warming should increase plant losses to invertebrates in the tundra. However, most of the observed variation in herbivory was associated with other site level characteristics, indicating that other local ecological factors also play an important role. More details about the local drivers of invertebrate herbivory are necessary to predict the consequences for rapidly changing tundra ecosystems.

Place, publisher, year, edition, pages
Springer, 2019. Vol. 42, no 10, p. 1881-1897
Keywords [en]
Background herbivory, Biomass loss, Climate change, Community-weighted average, Invertebrate, Insects, Tundra
National Category
Ecology
Identifiers
URN: urn:nbn:se:umu:diva-165784DOI: 10.1007/s00300-019-02568-3ISI: 000495702400009Scopus ID: 2-s2.0-85072103141OAI: oai:DiVA.org:umu-165784DiVA, id: diva2:1374899
Funder
Carl Tryggers foundation Swedish Research Council, 2012-1039Swedish Research Council, 2012-230Swedish Research Council, 2015-1091Available from: 2019-12-03 Created: 2019-12-03 Last updated: 2023-03-23Bibliographically approved

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Egelkraut, DagmarOlofsson, Johan

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