Nutrient enrichment alters the consequences of species loss
Nutrient enrichment alters the consequences of species loss
复制标题
营养富集改变了物种丧失的后果
DOI：
10.1111/1365-2745.12415
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发表时间：
2015
影响因子：
5.5
通讯作者：
I. Donohue
中科院分区：
文献类型：
--
作者：
Nessa E. O’Connor;M. E. Bracken;T. Crowe;I. Donohue
生物多样性的丧失和养分的富集是全球生态系统变化的两个最普遍的驱动因素。然而，人们对这些干扰如何相互作用影响生态系统功能知之甚少。我们建立了一个现场实验，以测试消费物种的损失对藻类组合（丰富度和组合结构）和生态系统功能（生态系统生产力和藻类生物量积累）在岩石海岸的影响。我们操纵了三种常见的软体动物食草动物物种在新创建的岩石池超过13个月的存在。我们的草食动物操作是基于减法实验设计，我们还操纵营养浓度，以明确评估资源的可用性如何影响物种损失的后果。我们发现，食草动物物种的损失对藻类组合及其功能的影响强烈依赖于食草动物物种的身份丢失和那些留在社区。此外，物种损失的影响取决于养分的供应情况，因此，如果不详细了解一个系统，就很难预测物种损失的影响。我们的研究结果清楚地表明，食草动物物种的损失对初级生产者和生态系统功能的影响可能无法根据食草动物的功能作用或特征来概括。合成.我们的研究结果强调，需要包括关键的物理驱动因素，如养分供应，明确进入生物多样性生态系统功能模型，以走向一个预测框架，结合环境异质性和人为压力的影响。
Loss of biodiversity and nutrient enrichment are two of the most pervasive drivers of change in ecosystems globally. However, little is known about how these disturbances interact to affect ecosystem functioning. We established a field experiment to test for effects of loss of consumer species on algal assemblages (richness and assemblage structure) and ecosystem functioning (ecosystem productivity and algal biomass accumulation) on rocky shores. We manipulated the presence of three common molluscan grazer species in newly created rock pools over 13 months. Our grazer manipulation was based on a subtractive experimental design, and we also manipulated nutrient concentrations to evaluate explicitly how resource availability affected the consequences of species loss. We found that the effects of loss of grazer species on algal assemblages and their functioning depended strongly on both the identity of the grazer species lost and of those remaining in the community. Moreover, the effects of loss of species depended on nutrient availability, making it extremely difficult to predict the effects of species loss generally without detailed knowledge of a system. Our results demonstrate clearly that the effects of grazer species loss on primary producers and ecosystem functioning may not be generalisable based on grazer functional roles or traits. Synthesis. Our findings highlight the need to include key physical drivers, such as nutrient availability, explicitly into biodiversity–ecosystem functioning models in order to move towards a predictive framework that incorporates the effects of both environmental heterogeneity and anthropogenic stressors.