High N2-fixation rate by unicellular cyanobacteria Crocosphaera watsonii in the north-western tropical Pacific

Title
High N2-fixation rate by unicellular cyanobacteria Crocosphaera watsonii in the north-western tropical Pacific
Alternative Title
열대 북서태평양에서 단세포성 Crocosphaera watsonii에 의한 높은 질소고정률
Author(s)
노재훈; 최동한; EJ Carpenter; 박인경; 김선화; 함미선; 이미진
KIOST Author(s)
Noh, Jae Hoon(노재훈)Choi, Dong Han(최동한)Lee, Charity Mijin(이미진)
Publication Year
2011-11-03
Abstract
Microbial N2-fixation is an important source of new nitrogen in oligotrophic open oceans and important in controlling biological productivity and carbon flux. Unicellular N2-fixing cyanobacteria, Crocosphaera watsonii, have only recently been discovered and are widely distributed in tropical waters. To elucidate the abundance and contribution to N2-fixation rates, we examined different water masses of the NW Pacific during October 2007, June 2008 and June 2010 research cruises. As a result, Crocosphaera watsonii showed a high abundance in the oligotrophic tropical waters whereas comparatively limited abundance was found in the temperate regions. In the oligotrophic tropical region, up to 3,500 cells/ml abundance was observed in June which were about 1,000 times higher than other types of diazotrophs. N2-fixation rates were 49.1~2,156.6 μmolN m-2d-1 in June and 20.9~171.7μmolN m-2d-1 in October showing much variation among different water masses. Relatively high N2-fixation rates observed in June for tropical waters were mostly due to high concentrations of Crocosphaera watsonii. Based on these results, we could conclude that Crocosphaera are important nitrogen fixers in the tropical waters and may contribute a significant new nitrogen source in this ecosystem.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/28091
Bibliographic Citation
한국해양학회 2011 추계학술발표대회, pp.127, 2011
Publisher
한국해양학회
Type
Conference
Language
English
Publisher
한국해양학회
Related Researcher
Research Interests

Marine Eco-Environment,Ocean legal regime/ocean policy/Ocean S&T,International Strategic Network,해양환경생태,해양법/해양정책/해양과학,전략적 국제네트워크

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