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Selection of scale can reverse the importance of stochastic controls on community assembly

Cited 6 time in Web of Science Cited 7 time in Scopus
Authors

Kim, Daehyun

Issue Date
2019-03
Publisher
V.H. Winston and Sons, Inc.
Citation
Physical Geography, Vol.40 No.2, pp.111-126
Abstract
Reconciling the long-standing debate on the importance of niche-related and neutral factors on community assembly, recent research suggests that both deterministic and stochastic processes operate simultaneously along a continuum in many biogeographical systems. In particular, stochastic processes seem to lose importance under stressful conditions, which results in the increasing influence of deterministic counterparts. In this paper, I show that, at local scales, this stochasticity-stress relationship can be reversed along the environmental stress gradients within a salt marsh: stochasticity manifested under harshness. Here, low-lying, more stressful sites contained all of the plant species of the local pool (i.e. a greater chance of ecological drift), whereas high-elevation, less stressful sites exhibited reduced species richness due to competitive exclusion (i.e. a lower chance of ecological drift). I conclude that determining whether the importance of stochasticity in shaping community structure is greater under benign or harsh conditions depends on the scale of interest.
ISSN
0272-3646
Language
ENG
URI
https://hdl.handle.net/10371/154209
DOI
https://doi.org/10.1080/02723646.2018.1548831
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