A Mesoscale Iron Enrichment in the Western Subarctic Pacific Induces a Large Centric Diatom Bloom

We have performed an in situ test of the iron limitation hypothesis in the subarctic North Pacific Ocean.A single enrichment of dissolved iron caused a large increase in phytoplankton standing stock and decreases in macronutrients and dissolved carbon dioxide.The dominant phytoplankton species shift...

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Bibliographic Details
Main Authors: Tsuda Atsushi, Takeda Shigenobu, Saito Hiroaki, Nishioka Jun, Nojiri Yukihiro, Kudo Isao, Kiyosawa Hiroshi, Shiomoto Akihiro, Imai Keir, Ono Tsuneo, Shimamoto Akifumi, Tsumune Daisuke, Yoshimura Takeshi, Aono Tatsuo, Hinuma Akira, Kinugasa Masatoshi, Suzuki Koji, Sohrin Yoshiki, Noiri Yoshifumi, Tani Heihachiro, Deguchi Yuji, Tsurushima Nobuo, Ogawa Hiroshi, Fukami Kimio, Kuma Kenshi, Saino Toshiro
Format: Article in Journal/Newspaper
Language:English
Published: 2003
Subjects:
Pacific
Subarctic
Online Access:https://repo.qst.go.jp/?action=repository_uri&item_id=43617
http://id.nii.ac.jp/1657/00043604/
Description
Summary:We have performed an in situ test of the iron limitation hypothesis in the subarctic North Pacific Ocean.A single enrichment of dissolved iron caused a large increase in phytoplankton standing stock and decreases in macronutrients and dissolved carbon dioxide.The dominant phytoplankton species shifted after the iron addition from pennate diatoms to a centric diatom,Chaetoceros debilis, that showed a very high growth rate,2.6 doublings per day.We conclude that the bioavailability of iron regulates the magnitude of the phytoplankton biomass and the key phytoplankton species that determine the biogeochemical sensitivity to iron supply of high-nitrate,low-chlorophyll waters.

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