Deep zooplankton rely on small particles when particle fluxes are low

Deep zooplankton rely on small particles when particle fluxes are low
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当颗粒通量较低时,深层浮游动物依赖小颗粒

DOI:
10.1002/lol2.10163
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发表时间:
2020
影响因子:
7.8
通讯作者:
Popp, Brian N.
Popp, Brian N.
中科院分区:
环境科学与生态学2区
文献类型:
--
作者:
Romero-Romero, Sonia;Ka’apu-Lyons, Cassie A.;Umhau, Blaire P.;Benitez-Nelson, Claudia R.;Hannides, Cecelia C.;Close, Hilary G.;Drazen, Jeffrey C.;Popp, Brian N.

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深海有机物(OM)的命运仍然是个谜,对海洋有机物的通量及其在深海食物网中的利用知之甚少。我们使用在粒度级别和深层浮游动物(700-1500 m)中测量的源氨基酸的化合物特异性氮稳定同位素比率,以确定小颗粒(0.7-53μm)与大颗粒(> 53μ m)在北太平洋四个地点对其饮食的贡献。我们的研究结果表明,小颗粒构成的浮游动物的饮食9%和98%之间,在较低的通量制度的网站的贡献更高。小颗粒的食物的深层浮游动物的贡献也较高时,生物量的垂直迁移,因此积极运输OM,较低。气候驱动的初级生产和出口变化预计将使颗粒通量转向更小的类别,因此它们在中层水食物网中的重要性可能变得更加广泛。
The fate of organic matter (OM) in the deep ocean remains enigmatic, with little understood regarding the flux and its utilization by deep food webs. We used compound‐specific nitrogen stable isotope ratios of source amino acids measured in particle size classes and deep zooplankton (700–1500 m) to determine the contribution of small (0.7–53μm) vs. large particles (> 53μm) to their diet at four sites in the North Pacific. Our results show that small particles constitute between 9% and 98% of zooplankton diets, being the contribution higher at sites with lower flux regimes. The contribution of small particles to the diet of deep zooplankton was also higher when biomass of vertical migrators, and therefore actively transported OM, was lower. Climate‐driven changes in primary production and export are expected to shift particle fluxes to smaller size classes, and thus their importance in midwater food webs may become more widespread.
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