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

• Published in: Nature Communications
• Main Authors: Pauli, Nora-Charlotte, Flintrop, Clara M., Konrad, Christian, Pakhomov, Evgeny A., Swoboda, Steffen, Koch, Florian, Wang, Xin-Liang, Zhang, Ji-Chang, Brierley, Andrew S., Bernasconi, Matteo, Meyer, Bettina, Iversen, Morten H.
• Other Authors: Niedersächsische Ministerium für Wissenschaft und Kultur
• Format: Article in Journal/Newspaper
• Language: English
• Published: Springer Science and Business Media LLC 2021
• Subjects: General Physics and Astronomy; General Biochemistry, Genetics and Molecular Biology; General Chemistry; Antarctic; Antarctic Peninsula; Southern Ocean; The Antarctic; Antarc*
• Online Access: http://dx.doi.org/10.1038/s41467-021-27436-9; https://www.nature.com/articles/s41467-021-27436-9.pdf; https://www.nature.com/articles/s41467-021-27436-9

Abstract 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 CO 2 in future.