Biogeochemical implications of biodiversity and community structure across multiple coastal ecosystems
Biogeochemical implications of biodiversity and community structure across multiple coastal ecosystems
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DOI：
10.1890/14-0331.1
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发表时间：
2015-02-01
影响因子：
6.1
通讯作者：
Rosemond, Amy D.
中科院分区：
文献类型：
--
作者：
Allgeier, Jacob E.;Layman, Craig A.;Rosemond, Amy D.
小规模的实验和理论表明，随着物种丰富度的增加，群落提供的生态功能变得更加稳定。这些模式是否表现在区域空间尺度和物种丰富的社区内（例如，珊瑚礁）在很大程度上未知。我们量化了五个生物地球化学过程，并在物种丰富的沿海鱼类群落的多功能性的综合措施，以测试三个问题：（1）以前预测的生物多样性生态系统功能的关系保持在大的空间尺度和高度多样化的社区？(2)社区结构的额外协变量能否改善这些关系？(3)在各种生态系统类型物种损失的情景下，群落生物量和功能群多样性在维持生物地球化学过程中的作用是什么？这些问题在珊瑚礁、红树林和海草生态系统的一个大的区域梯度上进行了测试。统计模型表明，物种丰富度和每种的平均最大身体大小强烈预测在所有生态系统类型的地球化学过程，但功能组多样性只是一个弱的预测。模拟物种损失的三种情况表明，保护社区生物量本身就增加了社区维持生态系统进程的能力。生物地球化学过程的多功能性保持最少的模拟，保存生物量和社区结构，强调相对缺乏的重要性，社区结构在维持多个同时在这个系统中的生态系统功能。研究结果表明，单独保护群落生物量可能足以维持某些生态地球化学过程，但当考虑保护多个同时生态地球化学过程，管理工作应首先集中在物种丰富度。
Small-scale experiments and theory suggest that ecological functions provided by communities become more stable with increased species richness. Whether these patterns manifest at regional spatial scales and within species-rich communities (e.g., coral reefs) is largely unknown. We quantified five biogeochemical processes, and an aggregate measure of multifunctionality, in species-rich coastal fish communities to test three questions: (1) Do previously predicted biodiversity-ecosystem-function relationships hold across large spatial scales and in highly diverse communities? (2) Can additional covariates of community structure improve these relationships? (3) What is the role of community biomass and functional group diversity in maintaining biogeochemical processes under various scenarios of species loss across ecosystem types? These questions were tested across a large regional gradient of coral reef, mangrove and seagrass ecosystems. Statistical models demonstrated that species richness and the mean maximum body size per species strongly predicted biogeochemical processes in all ecosystem types, but functional group diversity was only a weak predictor. Simulating three scenarios of species loss demonstrated that conserving community biomass alone increased the ability for communities to maintain ecosystem processes. Multifunctionality of biogeochemical processes was maintained least in simulations that conserved biomass and community structure, underscoring the relative lack of importance of community structure in maintaining multiple simultaneous ecosystem functions in this system. Findings suggest that conserving community biomass alone may be sufficient to sustain certain biogeochemical processes, but when considering conservation of multiple simultaneous biogeochemical processes, management efforts should focus first on species richness.