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Ecological Importance of Viral Lysis as a Loss Factor of Phytoplankton in the Amundsen Sea

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Title
Ecological Importance of Viral Lysis as a Loss Factor of Phytoplankton in the Amundsen Sea
Other Titles
아문젠해에서 식물플랑크톤 손실 인자로서의 바이러스 분해의 생태학적 중요성
Authors
Charlotte Eich
Tristan E. G. Biggs
Willem H. van de Poll
Mathijs van Manen
Hung-An Tian
Jung, Jinyoung
Lee, Youngju
Rob Middag
Corina P. D. Brussaard
Issue Date
2022
Citation
Charlotte Eich, et al. 2022. "Ecological Importance of Viral Lysis as a Loss Factor of Phytoplankton in the Amundsen Sea". MICROORGANISMS, 10(10): 1-19.
Abstract
Whether phytoplankton mortality is caused by grazing or viral lysis has important implications for phytoplankton dynamics and biogeochemical cycling. The ecological relevance of viral lysis for Antarctic phytoplankton is still under-studied. The Amundsen Sea is highly productive in spring and summer, especially in the Amundsen Sea Polynya (ASP), and very sensitive to global warming-induced ice-melt. This study reports on the importance of the viral lysis, compared to grazing, of pico- and nanophytoplankton, using the modified dilution method (based on apparent growth rates) in combination with flow cytometry and size fractionation. Considerable viral lysis was shown for all phytoplankton populations, independent of sampling location and cell size. In contrast, the average grazing rate was 116% higher for the larger nanophytoplankton, and grazing was also higher in the ASP (0.45 d?1 vs. 0.30 d?1outside). Despite average specific viral lysis rates being lower than grazing rates (0.17 d?1 vs. 0.29 d?1), the average amount of phytoplankton carbon lost was similar (0.6μg C L?1d?1 each). The viral lysis of the larger-sized phytoplankton populations (including diatoms) and the high lysis rates of the abundant P. antarctica contributed substantially to the carbon lost. Our results demonstrate that viral lysis is a principal loss factor to consider for Southern Ocean phytoplankton communities and ecosystem production.
URI
https://repository.kopri.re.kr/handle/201206/14101
DOI
http://dx.doi.org/10.3390/microorganisms10101967
Type
Article
Station
Araon
Indexed
SCIE
Appears in Collections  
2022-2022, Carbon cycle change and ecosystem response under the Southern Ocean warming (22-22) / Park, Jisoo (PE22110)
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