Abstract
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.
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Acknowledgements
This study is a contribution of the Herbivory Network (https://herbivory.lbhi.is). SIR and DSH were supported by the Natural Sciences and Engineering Research Council of Canada (RGPNS-305471); ICB was supported by a postdoctoral fellowship funded by the Icelandic Research Fund (Rannsóknasjóður, Grant nr 152468–051) and AXA Research Fund (15-AXA-PDOC-307); JMA was supported by Carl Tryggers Stiftelse för Vetenskaplig Forskning (Sweden) and Qatar Petroleum; MVK and VZ were supported by the Academy of Finland (Project 276671); AS and NS were supported by the Grant of Russian fund for basic research (18-05-60261); Field work on Bylot Island was supported by the Natural Sciences and Engineering Research Council of Canada, the network of Center of excellence ArcticNet, and the Polar Continental Shelf Program to GG and EL; SK and the Burntpoint Creek Research Station was supported by the Waterfowl, Wetlands and Far North research unit of the Ontario Ministry of Natural Resources and Forestry, with assistance from K. Bennet, R. Brook, and L. Pollock; O. Krasheninnikova assisted with the collection plant samples on Erkuta; SS was partly supported by a state assignment of the Institute of Plant and Animal Ecology UB RAS; DDE was supported by a Grant to JO from the Swedish Research Council Formas 2012–1039, 2012–230, 2015–1091 and a Grant to DDE from Gunnar and Ruth Björkmans fund for botanical research in northern Sweden; Sampling in Svalbard was conducted during an UNIS field course (ISJ); JSP was supported by the WSL Institute for Snow and Avalanche Research, and an INTERACT Transnational Access Research Grant; Research at Toolik Field Station by ALA was supported by National Science Foundation Grants DEB 102683 to support the Arctic LTER and OPP 0908502; JDMS was supported by the Research Council of Norway (262064); C. Brachmann assisted with Fig. 1; H.C. Proctor and B.A. Keddie assisted with gall damage determination.
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Rheubottom, S.I., Barrio, I.C., Kozlov, M.V. et al. Hiding in the background: community-level patterns in invertebrate herbivory across the tundra biome. Polar Biol 42, 1881–1897 (2019). https://doi.org/10.1007/s00300-019-02568-3
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DOI: https://doi.org/10.1007/s00300-019-02568-3