Environmental stress, facilitation, competition, and coexistence

Hart, Simon P. and Marshall, Dustin J. (2013) Environmental stress, facilitation, competition, and coexistence. Ecology, 94 12: 2719-2731. doi:10.1890/12-0804.1

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Author Hart, Simon P.
Marshall, Dustin J.
Title Environmental stress, facilitation, competition, and coexistence
Journal name Ecology   Check publisher's open access policy
ISSN 0012-9658
1939-9170
Publication date 2013-12
Sub-type Article (original research)
DOI 10.1890/12-0804.1
Open Access Status File (Publisher version)
Volume 94
Issue 12
Start page 2719
End page 2731
Total pages 13
Place of publication Ithaca, NY, United States
Publisher Ecological Society of America
Collection year 2014
Language eng
Abstract The major theories regarding the combined influence of the environment and species interactions on population and community dynamics appear to conflict. Stress/disturbance gradient models of community organization, such as the stress gradient hypothesis, emphasize a diminished role for competition in harsh environments whereas modern coexistence theory does not. Confusion about the role of species interactions in harsh environments is perpetuated by a disconnect between population dynamics theory and data. We linked theory and data using response surface experiments done in the field to parameterize mathematical, population-dynamic competition models. We replicated our experiment across two environments that spanned a common and important environmental stress gradient for determining community structure in benthic marine systems. We generated quantitative estimates of the effects of environmental stress on population growth rates and the direction and strength of intra- and interspecific interactions within each environment. Our approach directly addressed a perpetual blind spot in this field by showing how the effects of competition can be intensified in stressful environments even though the apparent strength of competition remains unchanged. Furthermore, we showed how simultaneous, reciprocal competitive and facilitative effects can stabilize population dynamics in multispecies communities in stressful environments.
Keyword Bugula neritina
Competition
Competition coefficients
Environmental stress
Facilitation
Filter-feeding bryozoans
Marine invertebrates
Multispecies communities
Ricker model
Stress gradient hypothesis
Watersipora subtorquata
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Copyright by the Ecological Society of America

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2014 Collection
School of Biological Sciences Publications
 
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