期刊
ECOLOGY LETTERS
卷 17, 期 7, 页码 855-865出版社
WILEY
DOI: 10.1111/ele.12296
关键词
Abundance fluctuations; biodiversity; demographic stochasticity; environmental variance; forest dynamics; neutral theory; niche stabilization
类别
资金
- Division Of Environmental Biology
- Direct For Biological Sciences [1354741] Funding Source: National Science Foundation
Long-term surveys of entire communities of species are needed to measure fluctuations in natural populations and elucidate the mechanisms driving population dynamics and community assembly. We analysed changes in abundance of over 4000 tree species in 12 forests across the world over periods of 6-28years. Abundance fluctuations in all forests are large and consistent with population dynamics models in which temporal environmental variance plays a central role. At some sites we identify clear environmental drivers, such as fire and drought, that could underlie these patterns, but at other sites there is a need for further research to identify drivers. In addition, cross-site comparisons showed that abundance fluctuations were smaller at species-rich sites, consistent with the idea that stable environmental conditions promote higher diversity. Much community ecology theory emphasises demographic variance and niche stabilisation; we encourage the development of theory in which temporal environmental variance plays a central role.
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