Krill body size drives particulate organic carbon export in West Antarctica

Krill body size drives particulate organic carbon export in West Antarctica
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磷虾的体型大小推动了南极洲西部的颗粒有机碳出口

DOI:
10.1038/s41586-023-06041-4
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发表时间:
2023
期刊:
影响因子:
64.8
通讯作者:
Fraser, William R.
Fraser, William R.
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Trinh, Rebecca;Ducklow, Hugh W.;Steinberg, Deborah K.;Fraser, William R.

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海洋表面碳的输出和海洋内部碳的储存对全球气候的调节起着重要作用。西南极半岛经历了一些最大的夏季颗粒有机碳(POC)的输出率,和最快的变暖速度之一,在世界上。为了了解气候变暖如何改变碳储存,有必要首先确定POC输出的模式和生态驱动因素。在这里,我们表明,南极磷虾(南极磷虾)的身体大小和生活史周期,而不是他们的整体生物量或区域环境因素,施加POC通量的主导控制。我们测量了POC通量超过21年,在南大洋最长的记录,并发现一个显着的5年周期性的年度POC通量,同步与磷虾的身体大小振荡,峰值时,磷虾种群主要由大的个人。磷虾的身体大小改变POC通量通过生产和出口的大小不等的粪便颗粒,占主导地位的总通量。冬季海冰是磷虾的重要栖息地,海冰的减少正在导致磷虾种群的变化,这可能会改变粪便颗粒的出口模式,导致海洋碳储存的变化。
The export of carbon from the ocean surface and storage in the ocean interior is important in the modulation of global climate, , –. The West Antarctic Peninsula experiences some of the largest summer particulate organic carbon (POC) export rates, and one of the fastest warming rates, in the world,. To understand how warming may alter carbon storage, it is necessary to first determine the patterns and ecological drivers of POC export,. Here we show that Antarctic krill (Euphausia superba) body size and life-history cycle, as opposed to their overall biomass or regional environmental factors, exert the dominant control on the POC flux. We measured POC fluxes over 21 years, the longest record in the Southern Ocean, and found a significant 5-year periodicity in the annual POC flux, which oscillated in synchrony with krill body size, peaking when the krill population was composed predominately of large individuals. Krill body size alters the POC flux through the production and export of size-varying faecal pellets, which dominate the total flux. Decreases in winter sea ice, an essential habitat for krill, are causing shifts in the krill population, which may alter these export patterns of faecal pellets, leading to changes in ocean carbon storage.
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