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Τίτλος: Climate variability has a stabilizing effect on the coexistence of prairie grasses
Συγγραφείς: HilleRisLambers, Janneke 
Kyriakidis, Phaedon 
Adler, Peter B. 
Guan, Qingfeng 
Levine, Jonathan M. 
Major Field of Science: Engineering and Technology
Field Category: Civil Engineering
Λέξεις-κλειδιά: Climate change;Competition;Grassland;Plant community;Population dynamics
Ημερομηνία Έκδοσης: 22-Αυγ-2006
Πηγή: Proceedings of the National Academy of Sciences of the United States of America, Volume 103, Issue 34, 22 August 2006, Pages 12793-12798
Volume: 103
Issue: 34
Περιοδικό: Proceedings of the National Academy of Sciences of the United States of America 
Περίληψη: How expected increases in climate variability will affect species diversity depends on the role of such variability in regulating the coexistence of competing species. Despite theory linking temporal environmental fluctuations with the maintenance of diversity, the importance of climate variability for stabilizing coexistence remains unknown because of a lack of appropriate long-term observations. Here, we analyze three decades of demographic data from a Kansas prairie to demonstrate that interannual climate variability promotes the coexistence of three common grass species. Specifically, we show that (i) the dynamics of the three species satisfy all requirements of "storage effect" theory based on recruitment variability with overlapping generations, (ii) climate variables are correlated with interannual variation in species performance, and (iii) temporal variability increases low-density growth rates, buffering these species against competitive exclusion. Given that environmental fluctuations are ubiquitous in natural systems, our results suggest that coexistence based on the storage effect may be underappreciated and could provide an important alternative to recent neutral theories of diversity. Field evidence for positive effects of variability on coexistence also emphasizes the need to consider changes in both climate means and variances when forecasting the effects of global change on species diversity. © 2006 by The National Academy of Sciences of the USA.
URI: https://hdl.handle.net/20.500.14279/14390
ISSN: 278424
DOI: 10.1073/pnas.0600599103
Type: Article
Affiliation: Utah State University 
University of California 
Publication Type: Peer Reviewed
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