Complementarity in spatial subsidies of carbon associated with resource partitioning along multiple niche axes
Complementarity in spatial subsidies of carbon associated with resource partitioning along multiple niche axes
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DOI：
10.1007/s00442-020-04691-z
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发表时间：
2020-06-17
期刊：
影响因子：
2.7
通讯作者：
Bracken, Matthew E. S.
中科院分区：
文献类型：
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作者：
Bracken, Matthew E. S.
多个物种的共存，所有这些物种都有相似的资源需求，仍然是生态学中的一个悖论。在这里，我沿着多个环境轴评估了资源利用，以了解悬浮进食的岩石海岸无脊椎动物群落的生态位划分和互补性的潜力。我重点关注的是贻贝：Perna canaliculus、Mytilus galloprovincialis、Aulacomya maoriana 和 Xenostrobus pulex，它们都共存于新西兰南岛的海岸线。我量化了贻贝在海岸上的垂直分布和三维贻贝床基质内的分布，并使用碳 (delta C-13) 和氮 (delta N-15) 稳定同位素比率来比较物种的饮食。贻贝沿着所有资源轴表现出生态位划分。考虑到贻贝使用不同的空间和食物资源，我评估了贻贝作为重要空间补贴（从近岸海洋到岩岸生态系统的碳输入）中介者的互补性潜力。在这些系统中，贻贝是基础物种，捕获并消耗海洋中的颗粒有机物，并将其供底栖群落内的当地消费。我发现贻贝的多样性很重要；即使是生产力最高的物种——贻贝（Perna canaliculus）——也只贡献了贻贝一年多积累的碳的一半左右。因此，多个共存物种可能比任何一个独立生活的物种在潮间带食物网的基础上提供更多的碳，并且沿着多个环境轴的资源利用的互补性可能是这种关系背后的重要机制。
The co-occurrence of several species, all of which share similar resource requirements, remains a paradox in ecology. Here, I evaluated resource use along multiple environmental axes to understand the potential for niche partitioning and complementarity in a guild of suspension-feeding rocky shore invertebrates. I focused on the musselsPerna canaliculus,Mytilus galloprovincialis,Aulacomya maoriana, andXenostrobus pulex, all of which coexist along the coastline of the South Island of New Zealand. I quantified the mussels' distributions, both vertically on the shore and within the three-dimensional mussel bed matrix, and used carbon (delta C-13) and nitrogen (delta N-15) stable isotope ratios to compare species' diets. Mussels exhibited niche partitioning along all resource axes. Given the mussels' use of different spatial and food resources, I evaluated the potential for complementarity with respect to mussels' roles as mediators of an important spatial subsidy, carbon inputs from the nearshore ocean into rocky-shore ecosystems. In these systems, mussels are basal species, capturing and consuming particulate organic matter in the ocean and making it available for local consumption within the benthic community. I found that mussel diversity matters; even the most productive species-Perna canaliculus-only contributed about half of the mussel-mediated carbon that accumulated over a year. Multiple co-occurring species are, therefore, likely to provide more carbon at the base of the intertidal food web than any one species living independently, and complementarity in resource use along multiple environmental axes is likely an important mechanism underlying this relationship.