Marine mixotrophy increases trophic transfer efficiency, mean organism size, and vertical carbon flux
Marine mixotrophy increases trophic transfer efficiency, mean organism size, and vertical carbon flux
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DOI：
10.1073/pnas.1517118113
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发表时间：
2016-03-15
影响因子：
11.1
通讯作者：
Follows, Michael J.
中科院分区：
文献类型：
--
作者：
Ward, Ben A.;Follows, Michael J.
混合营养型浮游生物是一种联合收割机，它将无机资源的吸收和活体猎物的摄食结合在一起，在海洋生态系统中普遍存在，但其综合生物地球化学影响尚不清楚。我们解决这个问题，从海洋浮游生物食物网的全球模型中删除浮游植物和浮游动物之间的严格区分。这种简化允许一个现实的营养网络的出现，增加保真度的浮游生物群落结构和元素化学计量的经验估计，相对于一个系统，其中自养和异养是相互排斥的。混合营养增强了生物质向食物链上游更大规模类别的转移，导致全球平均生物体大小增加约三倍，下沉碳通量增加约35%。
Mixotrophic plankton, which combine the uptake of inorganic resources and the ingestion of living prey, are ubiquitous in marine ecosystems, but their integrated biogeochemical impacts remain unclear. We address this issue by removing the strict distinction between phytoplankton and zooplankton from a global model of the marine plankton food web. This simplification allows the emergence of a realistic trophic network with increased fidelity to empirical estimates of plankton community structure and elemental stoichiometry, relative to a system in which autotrophy and heterotrophy are mutually exclusive. Mixotrophy enhances the transfer of bio-mass to larger sizes classes further up the food chain, leading to an approximately threefold increase in global mean organism size and an similar to 35% increase in sinking carbon flux.