Export stoichiometry and contribution of copepod faecal pellets to vertical flux of particulate organic carbon, nitrogen and phosphorus
Export stoichiometry and contribution of copepod faecal pellets to vertical flux of particulate organic carbon, nitrogen and phosphorus
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桡足类粪便颗粒的出口化学计量和对颗粒有机碳、氮和磷垂直通量的贡献
DOI：
10.3354/meps09733
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发表时间：
2012
影响因子：
2.5
通讯作者：
C. W. Riser
中科院分区：
文献类型：
--
作者：
Tobias Tamelander;A. Aubert;C. W. Riser
颗粒下沉是有机物从海洋表层向深海和沉积物输送的关键机制，但也造成了碳和限制生长的营养物质向远洋食物网的损失。尽管颗粒磷在许多海洋系统中是一个共同限制因素，但对颗粒磷出口的了解仍然有限，特别是在高纬度地区。因此，我们调查了弗拉姆海峡和巴伦支海开口处 3 个对比地点的颗粒有机碳 (POC)、氮 (PON) 和总颗粒磷 (TPP) 的悬浮浓度和垂直出口（通过沉积物捕集器），并量化了浮游动物粪便颗粒对 POC、PON 和 TPP 出口的贡献。 TPP 通量是该地区首次报告的，也可能是整个北冰洋首次报告的。悬浮和输出的 C:N 比率接近 Redfield 比率，并且彼此之间没有显着差异（平均原子比分别为 6.1 和 6.3）。悬浮颗粒的平均 C:P (91) 低于 Redfield，而输出平均值 (117) 超过 Redfield，表明水体中磷的保留效率高于氮的保留效率。桡足类粪便颗粒的 C:P 比率较低，对磷输出的贡献（平均为 17%）高于对碳和氮输出的贡献（10%）。因此，与沉降较慢的物质相比，粪便颗粒可能是水柱中磷的重要损失因素，后者的保留效率更高。
Sinking of particles is a key mechanism in the transport of organic matter from the ocean's productive surface layer to the deep sea and sediments, but also constitutes a loss of car- bon and growth-limiting nutrients to the pelagic food web. Knowledge on export of particulate phosphorus is limited, particularly in high-latitude regions, in spite of its role as a co-limiting fac- tor in many marine systems. We therefore investigated suspended concentrations and vertical export (by means of sediment traps) of particulate organic carbon (POC), nitrogen (PON) and total particulate phosphorus (TPP) at 3 contrasting sites in the Fram Strait and Barents Sea opening and quantified the contribution of zooplankton faecal pellets to POC, PON and TPP export. The TPP fluxes are the first to be reported from this region and probably the first from the entire Arctic Ocean. The suspended and exported C:N ratios were close to the Redfield ratio and did not differ significantly from each other (mean atomic ratios of 6.1 and 6.3, respectively). The mean C:P of suspended particles (91) was below Redfield, whereas the exported mean (117) exceeded Red- field, indicating more efficient retention of phosphorus than of nitrogen in the water column. Copepod faecal pellets had low C:P ratios and contributed a higher proportion to phosphorus export (mean of 17%) than to carbon and nitrogen export (10%). Faecal pellets may therefore be an important loss factor for phosphorus from the water column compared to slower-sinking material, which is retained more efficiently.