期刊
ECOLOGY LETTERS
卷 22, 期 10, 页码 1658-1667出版社
WILEY
DOI: 10.1111/ele.13341
关键词
Avena; California grasslands; Erodium; fluctuation-dependent; modern coexistence theory; rangelands; relative nonlinearity; resource acquisitive; storage effect; stress tolerant
类别
资金
- USDA [2014 - 67019 - 21613]
- G. A. Harris Research Instrumentation Fellowship
- USDA NIFA Pre-Doctoral Fellowship [2015 - 67011 - 22829]
- Philomathia Fellowship
- James S. McDonnell Foundation [220020513]
Environmental variability can structure species coexistence by enhancing niche partitioning. Modern coexistence theory highlights two fluctuation-dependent temporal coexistence mechanisms -the storage effect and relative nonlinearity - but empirical tests are rare. Here, we experimentally test if environmental fluctuations enhance coexistence in a California annual grassland. We manipulate rainfall timing and relative densities of the grass Avena barbata and forb Erodium botrys, parameterise a demographic model, and partition coexistence mechanisms. Rainfall variability was integral to grass-forb coexistence. Variability enhanced growth rates of both species, and early-season drought was essential for Erodium persistence. While theoretical developments have focused on the storage effect, it was not critical for coexistence. In comparison, relative nonlinearity strongly stabilised coexistence, where Erodium experienced disproportionately high growth under early-season drought due to competitive release from Avena. Our results underscore the importance of environmental variability and suggest that relative nonlinearity is a critical if underappreciated coexistence mechanism.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据