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Increase in Si:N drawdown ratio due to resting spore formation by spring bloom-forming diatoms under Fe- and N-limited conditions in the Oyashio region

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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/48987

Title: Increase in Si:N drawdown ratio due to resting spore formation by spring bloom-forming diatoms under Fe- and N-limited conditions in the Oyashio region
Authors: Sugie, Koji Browse this author
Kuma, Kenshi Browse this author →KAKEN DB
Fujita, Satoshi Browse this author
Ikeda, Tsutomu Browse this author →KAKEN DB
Keywords: diatom
iron
resting spore
Si:N drawdown ratio
spring bloom
Oyashio region
Issue Date: 1-Jan-2010
Publisher: ELSEVIER SCIENCE BV
Journal Title: JOURNAL OF EXPERIMENTAL MARINE BIOLOGY AND ECOLOGY
Volume: 382
Issue: 2
Start Page: 108
End Page: 116
Publisher DOI: 10.1016/j.jembe.2009.11.001
Abstract: Resting spore formation and Si:N drawdown ratios were investigated under iron (Fe)- and nitrogen (N)-limited conditions using a unialgal culture of Thalassiosira nordenskioeldii and natural phytoplankton assemblages during the spring bloom in the Oyashio region. In the unialgal culture of T nordenskioeldii, 20% and 100% of the cells formed resting spores under Fe- and N-limited conditions, respectively. The Si:N drawdown ratios were 2- and 14-fold higher in Fe- and N-limited conditions, respectively, compared to Fe- and N-sufficient conditions. At the start of the natural phytoplankton incubation, 18 among 47 identified diatom species were known resting spore-forming species. Approximately 15 common diatom species formed resting spores under Fe- and N-limited conditions. During the natural phytoplankton incubation, the percentage of the resting spores increased with time under both Fe- and N-limited conditions, reaching 25% and 40% of total diatom abundance, respectively. The Si: N drawdown ratios significantly increased with an increase in the contribution of resting spores in both the unialgal culture and natural phytoplankton incubations. These results suggest that if the bloom dominated by neritic, resting spore-forming diatom species decline by either Fe- or N-depletion, Si may be utilized preferentially to N in the upper mixed layer due to the formation of heavily silicified resting spores.
Type: article (author version)
URI: http://hdl.handle.net/2115/48987
Appears in Collections:環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 杉江 恒二

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