生物多样性
种内竞争
生态学
种间竞争
促进
生态系统
竞赛(生物学)
物种丰富度
生态网络
共存理论
社区
自然(考古学)
植物群落
地理
生物
环境资源管理
环境科学
考古
神经科学
作者
Malyon D. Bimler,Daniel B. Stouffer,Trace E. Martyn,Margaret M. Mayfield
摘要
Abstract Species interactions are key drivers of biodiversity and ecosystem stability. Current theoretical frameworks for understanding the role of interactions make many assumptions which unfortunately, do not always hold in natural, diverse communities. This mismatch extends to annual plants, a common model system for studying coexistence, where interactions are typically averaged across environmental conditions and transitive competitive hierarchies are assumed to dominate. We quantify interaction networks for a community of annual wildflowers in Western Australia across a natural shade gradient at local scales. Whilst competition dominated, intraspecific and interspecific facilitation were widespread in all shade categories. Interaction strengths and directions varied substantially despite close spatial proximity and similar levels of local species richness, with most species interacting in different ways under different environmental conditions. Contrary to expectations, all networks were predominantly intransitive. These findings encourage us to rethink how we conceive of and categorize the mechanisms driving biodiversity in plant systems.
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