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Type: Journal article
Title: Trophic compensation reinforces resistance: herbivory absorbs the increasing effects of multiple disturbances
Author: Ghedini, G.
Russell, B.
Connell, S.
Citation: Ecology Letters, 2015; 18(2):182-187
Publisher: Wiley
Issue Date: 2015
ISSN: 1461-023X
Statement of
Giulia Ghedini, Bayden D. Russell and Sean D. Connell
Abstract: Disturbance often results in small changes in community structure, but the probability of transitioning to contrasting states increases when multiple disturbances combine. Nevertheless, we have limited insights into the mechanisms that stabilise communities, particularly how perturbations can be absorbed without restructuring (i.e. resistance). Here, we expand the concept of compensatory dynamics to include countervailing mechanisms that absorb disturbances through trophic interactions. By definition, ‘compensation’ occurs if a specific disturbance stimulates a proportional countervailing response that eliminates its otherwise unchecked effect. We show that the compounding effects of disturbances from local to global scales (i.e. local canopy-loss, eutrophication, ocean acidification) increasingly promote the expansion of weedy species, but that this response is countered by a proportional increase in grazing. Finally, we explore the relatively unrecognised role of compensatory effects, which are likely to maintain the resistance of communities to disturbance more deeply than current thinking allows.
Keywords: climate change; compensatory; inertia; stressors; top-down
Rights: © 2015 John Wiley & Sons Ltd/CNRS
RMID: 0030020166
DOI: 10.1111/ele.12405
Appears in Collections:Ecology, Evolution and Landscape Science publications

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