| Title: | Late Holocene centennial to millennial-scale variability in lower trophic level productivity off southern Hokkaido, Japan, and its response to dissolved iron-replete Coastal Oyashio dynamics |
| Authors: | Kuwae, Michinobu Browse this author →KAKEN DB |
| Tsugeki, Narumi Browse this author →KAKEN DB |
| Finney, Bruce P. Browse this author |
| Tani, Yukinori Browse this author →KAKEN DB |
| Onodera, Jonaotaro Browse this author →KAKEN DB |
| Kiyoto, Mako Browse this author |
| Kusaka, Mitsukuni Browse this author |
| Sagawa, Takuya Browse this author |
| Nakamura, Yugo Browse this author |
| Ohnishi, Hiroji Browse this author |
| Kuroda, Hiroshi Browse this author →KAKEN DB |
| Okuda, Noboru Browse this author →KAKEN DB |
| Ohta, Tamihisa Browse this author |
| Ikehara, Minoru Browse this author →KAKEN DB |
| Irino, Tomohisa Browse this author →KAKEN DB |
| Keywords: | Marine productivity |
| Phytoplankton |
| Zooplankton |
| Centennial- to millennial-scale changes |
| Coastal Oyashio |
| Dissolved iron |
| Western North Pacific |
| Late Holocene |
| Issue Date: | May-2022 |
| Publisher: | Cambridge University Press |
| Journal Title: | Quaternary Research |
| Volume: | 107 |
| Start Page: | 27 |
| End Page: | 42 |
| Publisher DOI: | 10.1017/qua.2021.71 |
| Abstract: | Little is known about the dynamics of marine food chains spanning primary to higher trophic levels on centennial and longer timescales, especially where the supply of dissolved iron limits primary productivity. To elucidate the long-term dynamics of biological productivity in the Coastal Oyashio (CO), which is a major pathway for transporting dissolved iron into the western North Pacific from winter to spring, we reconstructed the lower trophic level productivity over the last 3000 years in the CO. Our results demonstrate that the concentrations and mass accumulation rates of both Chl-a (chlorophyll a and its derivatives) and biogenic opal used as proxies of primary productivity, and steryl chlorin esters (SCEs) used as that of zooplankton productivity, show a millennial-scale increasing trend and centennial-scale variability beginning ca. AD 400. SCEs were positively correlated with Chl-a, indicating that changes in zooplankton productivity were induced by bottom-up control of primary productivity. The Chl-a and SCEs showed synchronous centennial-scale patterns with a relative abundance of sea-ice-associated diatom species transported by CO, and with a ventilation index in the Okhotsk Sea Intermediate Water. This synchronous pattern indicates that lower trophic-level productivity during the spring bloom responded to the intensity of iron-replete CO. |
| Rights: | This article has been published in a revised form in Quaternary Research, https://doi.org/10.1017/qua.2021.71. This version is free to view and download for private research and study only. Not for re-distribution or re-use. © copyright holder. |
| https://creativecommons.org/licenses/by/4.0/ |
| Type: | article |
| URI: | http://hdl.handle.net/2115/86599 |
| 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)
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