Temperature effects on prey and basal resources exceed that of predators in an experimental community

Madhav P. Thakur (Corresponding author), John N. Griffin, Tom Künne, Susanne Dunker, Andrea Fanesi, Nico Eisenhauer

Research output: Contribution to journal/periodicalArticleScientificpeer-review

60 Downloads (Pure)

Abstract

Abstract Climate warming alters the structure of ecological communities by modifying species interactions at different trophic levels. Yet, the consequences of warming-led modifications in biotic interactions at higher trophic levels on lower trophic groups are lesser known. Here, we test the effects of multiple predator species on prey population size and traits and subsequent effects on basal resources along an experimental temperature gradient (12?15°C, 17?20°C, and 22?25°C). We experimentally assembled food web modules with two congeneric predatory mites (Hypoaspis miles and Hypoaspis aculeifer) and two Collembola prey species (Folsomia candida and Proisotoma minuta) on a litter and yeast mixture as the basal resources. We hypothesized that warming would modify interactions within and between predator species, and that these alterations would cascade to basal resources via changes in the density and traits (body size and lipid: protein ratio) of the prey species. The presence of congeners constrained the growth of the predatory species independent of warming despite warming increased predator density in their respective monocultures. We found that warming effects on both prey and basal resources were greater than the effects of predator communities. Our results further showed opposite effects of warming on predator (increase) and prey densities (decrease), indicating a warming-induced trophic mismatch, which are likely to alter food web structures. We highlight that warmer environments can restructure food webs by its direct effects on lower trophic groups even without modifying top-down effects.
Original languageEnglish
Pages (from-to)12670-12680
Number of pages11
JournalEcology and Evolution
Volume8
Issue number24
DOIs
Publication statusPublished - 01 Dec 2018

Keywords

  • international
  • litter decomposition
  • microbial biomass
  • multiple predator effects
  • trait-mediated interactions
  • trophic cascade
  • trophic mismatch
  • ectotherms

Fingerprint Dive into the research topics of 'Temperature effects on prey and basal resources exceed that of predators in an experimental community'. Together they form a unique fingerprint.

  • Datasets

    Data from: Temperature effects on prey and basal resources exceed that of predators in an experimental community

    Thakur, M. P. (Creator), Griffin, J. N. (Creator), Künne, T. (Creator), Dunker, S. (Creator), Fanesi, A. (Creator) & Eisenhauer, N. (Creator), Dryad, 21 Dec 2018

    Dataset

    Cite this

    Thakur, M. P., Griffin, J. N., Künne, T., Dunker, S., Fanesi, A., & Eisenhauer, N. (2018). Temperature effects on prey and basal resources exceed that of predators in an experimental community. Ecology and Evolution, 8(24), 12670-12680. https://doi.org/10.1002/ece3.4695