Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/112770
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Type: Journal article
Title: The duality of ocean acidification as a resource and a stressor
Author: Connell, S.
Doubleday, Z.
Foster, N.
Hamlyn, S.
Harley, C.
Helmuth, B.
Kelaher, B.
Nagelkerken, I.
Rodgers, K.
Sarà, G.
Russell, B.
Citation: Ecology, 2018; 99(5):1005-1010
Publisher: Wiley
Issue Date: 2018
ISSN: 0012-9658
1939-9170
Statement of
Responsibility: 
Sean D. Connell, Zoë A. Doubleday, Nicole R. Foster, Sarah B. Hamlyn, Christopher D.G. Harley, Brian Helmuth, Brendan P. Kelaher, Ivan Nagelkerken, Kirsten L. Rodgers, Gianluca Sará, and Bayden D. Russell
Abstract: Ecologically dominant species often define ecosystem states, but as human disturbances intensify, their subordinate counterparts increasingly displace them. We consider the duality of disturbance by examining how environmental drivers can simultaneously act as a stressor to dominant species and as a resource to subordinates. Using a model ecosystem, we demonstrate that CO₂ -driven interactions between species can account for such reversals in dominance; i.e., the displacement of dominants (kelp forests) by subordinates (turf algae). We established that CO₂ enrichment had a direct positive effect on productivity of turfs, but a negligible effect on kelp. CO₂ enrichment further suppressed the abundance and feeding rate of the primary grazer of turfs (sea urchins), but had an opposite effect on the minor grazer (gastropods). Thus, boosted production of subordinate producers, exacerbated by a net reduction in its consumption by primary grazers, accounts for community change (i.e., turf displacing kelp). Ecosystem collapse, therefore, is more likely when resource enrichment alters competitive dominance of producers, and consumers fail to compensate. By recognizing such duality in the responses of interacting species to disturbance, which may stabilize or exacerbate change, we can begin to understand how intensifying human disturbances determine whether or not ecosystems undergo phase shifts.
Keywords: Calcifying herbivores; climate change; CO₂; kelp forest; phase shift; turf algae
Rights: © 2018 by the Ecological Society of America
RMID: 0030086409
DOI: 10.1002/ecy.2209
Grant ID: http://purl.org/au-research/grants/arc/DP150104263
http://purl.org/au-research/grants/arc/FT0991953
http://purl.org/au-research/grants/arc/FT120100183
Appears in Collections:Ecology, Evolution and Landscape Science publications

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