Nutrient loading associated with agriculture land use dampens the importance of consumer-mediated niche construction.
Nutrient loading associated with agriculture land use dampens the importance of consumer-mediated niche construction.
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与农业土地利用相关的养分负荷削弱了消费者介导的利基建设的重要性。
作者：
Daniel E. Spooner;P. Frost;H. Hillebrand;M. T. Arts;Olivia A. Puckrin;M. Xenopoulos
生物群落和生态系统功能之间的联系仍然知之甚少，沿着梯度的人类引起的压力。我们研究了如何资源供应（养分循环），介导的本地淡水贻贝，影响底栖生物群落的结构和功能相结合的观测数据和现场实验。我们比较了以下内容：（1）在集水农业梯度上，活贻贝贝壳和附近岩石上的元素和群落组成（藻类色素和大型无脊椎动物）;（2）在控制初始群落组成和定殖持续时间的活贝壳和假贝壳上对底栖生物群落进行实验定殖。我们发现，在近原始系统中，贻贝介导的营养异质性与更大的生物多样性的社区，这支持了资源异质性可以促进生物多样性的概念。然而，随着集水区营养物质的增加，贻贝提供的营养物质的相关性几乎被消除。虽然物种可以在受干扰的系统中持续存在，但它们的功能相关性可能会减少或丧失。
The linkages between biological communities and ecosystem function remain poorly understood along gradients of human-induced stressors. We examined how resource provisioning (nutrient recycling), mediated by native freshwater mussels, influences the structure and function of benthic communities by combining observational data and a field experiment. We compared the following: (1) elemental and community composition (algal pigments and macroinvertebates) on live mussel shells and on nearby rocks across a gradient of catchment agriculture and (2) experimental colonisation of benthic communities on live vs. sham shells controlling for initial community composition and colonisation duration. We show that in near pristine systems, nutrient heterogeneity mediated by mussels relates to greater biodiversity of communities, which supports the notion that resource heterogeneity can foster biological diversity. However, with increased nutrients from the catchment, the relevance of mussel-provisioned nutrients was nearly eliminated. While species can persist in disturbed systems, their functional relevance may be diminished or lost.