Competitive displacement alters top-down effects on carbon dioxide concentrations in a freshwater ecosystem

Atwood, Trisha B., Hammill, Edd, Srivastava, Diane S. and Richardson, John S. (2014) Competitive displacement alters top-down effects on carbon dioxide concentrations in a freshwater ecosystem. Oecologia, 175 1: 353-361. doi:10.1007/s00442-013-2877-3


Author Atwood, Trisha B.
Hammill, Edd
Srivastava, Diane S.
Richardson, John S.
Title Competitive displacement alters top-down effects on carbon dioxide concentrations in a freshwater ecosystem
Journal name Oecologia   Check publisher's open access policy
ISSN 0029-8549
1432-1939
Publication date 2014-05-01
Year available 2014
Sub-type Article (original research)
DOI 10.1007/s00442-013-2877-3
Volume 175
Issue 1
Start page 353
End page 361
Total pages 9
Place of publication Heidelberg, Germany
Publisher Springer
Language eng
Formatted abstract
Climate change and invasive species have the potential to alter species diversity, creating novel species interactions. Interspecific competition and facilitation between predators may either enhance or dampen trophic cascades, ultimately influencing total predator effects on communities and biogeochemical cycling of ecosystems. However, previous studies have only investigated the effects of a single predator species on CO2 flux of aquatic ecosystems. In this study, we measured and compared the individual and joint effects of predatory damselfly larvae and diving beetles on total prey biomass, leaf litter processing, and dissolved CO2 concentrations of experimental bromeliad ecosystems. Damselfly larvae created strong trophic cascades that reduced CO2 concentrations by ~46 % relative to no-predator treatments. Conversely, the effects of diving beetles on prey biomass, leaf litter processing, and dissolved CO2 were not statistically different to no-predator treatments. Relative to multiplicative null models, the presence of damselfly larvae and diving beetles together resulted in antagonistic relations that eliminated trophic cascades and top-down influences on CO2 concentrations. Furthermore, we showed that the antagonistic interactions between predators occurred due to a tactile response that culminated in competitive displacement of damselfly larvae. Our results demonstrate that predator identity and predator–predator interactions can influence CO2 concentrations of an aquatic ecosystem. We suggest that predator effects on CO2 fluxes may depend on the particular predator species removed or added to the ecosystem and their interactions with other predators.
Keyword Bromeliads
Carbon dioxide saturation
Multiple-predator effects
Interference competition
Trophic cascades
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Global Change Institute Publications
Official 2015 Collection
 
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Citation counts: TR Web of Science Citation Count  Cited 9 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 9 times in Scopus Article | Citations
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Created: Sun, 25 May 2014, 10:04:03 EST by System User on behalf of Global Change Institute