Positive interactions expand habitat use and the realized niches of sympatric species

Niche theory, the oldest, most established community assembly model, predicts that in sympatry, the realized niche will contract due to negative interspecific interactions, but fails to recognize the effects of positive interactions on community assembly. The stress gradient hypothesis predicts that...

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Bibliographic Details
Published in:Ecology (Durham) 2015-10, Vol.96 (10), p.2575-2582
Main Authors: Crotty, Sinead M, Bertness, Mark D
Format: Article
Language:English
Subjects:
cobble beach
Cobbles
Community ecology
Demography
Ecological competition
Ecological genetics
Ecological niches
Ecology
Ecosystem
facilitation
foundation species
Grasses
Habitats
Hypothesis testing
Marine ecology
Mortality
Narragansett Bay, Rhode Island, USA
niche theory
Oceans and Seas
Poaceae - physiology
Rhode Island
Spartina alterniflora
Species
species distribution model
Species Specificity
stress gradient hypothesis
Stress response
Stress, Physiological
Synecology
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Summary:Niche theory, the oldest, most established community assembly model, predicts that in sympatry, the realized niche will contract due to negative interspecific interactions, but fails to recognize the effects of positive interactions on community assembly. The stress gradient hypothesis predicts that positive interactions expand realized niches in stressful habitats. We tested the predictions of the stress gradient hypothesis in a cobble beach model system across both physical and biological stress gradients. We transplanted seven common littoral species within, adjacent to, and below Spartina alterniflora cordgrass stands in control, cage control, predator exclusion cage, shade, and shaded predator exclusion cage treatments to test the hypothesis that cordgrass expands intertidal organism habitats. On cobble beaches, cordgrass ameliorates physical and predation stresses, expanding the distribution and realized niches of species to habitats in which they cannot live without facilitation, suggesting that niche theory and species distribution models should be amended to accommodate the role of positive interactions in community assembly.
ISSN:0012-9658
1939-9170
DOI:10.1890/15-0240.1