Krill and salp faecal pellets contribute equally to the carbon flux at the Antarctic Peninsula

文献类型： 外文期刊

第一作者： Pauli, Nora-Charlotte

作者： Pauli, Nora-Charlotte;Meyer, Bettina;Pauli, Nora-Charlotte;Flintrop, Clara M.;Konrad, Christian;Koch, Florian;Meyer, Bettina;Iversen, Morten H.;Flintrop, Clara M.;Konrad, Christian;Swoboda, Steffen;Iversen, Morten H.;Flintrop, Clara M.;Konrad, Christian;Swoboda, Steffen;Iversen, Morten H.;Pakhomov, Evgeny A.;Pakhomov, Evgeny A.;Pakhomov, Evgeny A.;Wang, Xin-Liang;Zhang, Ji-Chang;Brierley, Andrew S.;Bernasconi, Matteo;Meyer, Bettina

作者机构：

期刊名称：NATURE COMMUNICATIONS （ 影响因子：17.694； 五年影响因子：17.763 ）

ISSN：

年卷期： 2021 年 12 卷 1 期

页码：

收录情况： SCI

摘要： Zooplankton impact Southern Ocean carbon cycling. Here, the authors examine carbon export at the Antarctic Peninsula, finding that krill pellets are efficiently exported, while salp pellets are retained and recycled in surface waters. Krill and salps are important for carbon flux in the Southern Ocean, but the extent of their contribution and the consequences of shifts in dominance from krill to salps remain unclear. We present a direct comparison of the contribution of krill and salp faecal pellets (FP) to vertical carbon flux at the Antarctic Peninsula using a combination of sediment traps, FP production, carbon content, microbial degradation, and krill and salp abundances. Salps produce 4-fold more FP carbon than krill, but the FP from both species contribute equally to the carbon flux at 300 m, accounting for 75% of total carbon. Krill FP are exported to 72% to 300 m, while 80% of salp FP are retained in the mixed layer due to fragmentation. Thus, declining krill abundances could lead to decreased carbon flux, indicating that the Antarctic Peninsula could become a less efficient carbon sink for anthropogenic CO2 in future.

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