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Mesozooplankton response to iron enrichment during the diatom bloom and bloom decline in SERIES (NE Pacific)

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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/17204

Title: Mesozooplankton response to iron enrichment during the diatom bloom and bloom decline in SERIES (NE Pacific)
Authors: Tsuda, Atsushi Browse this author
Saito, Hiroaki Browse this author
Nishioka, Jun Browse this author
Ono, Tsuneo Browse this author
Noiri, Yoshifumi Browse this author
Kudo, Isao Browse this author →KAKEN DB
Keywords: Iron enrichment
Copepod
Vertical distribution
Grazing
Zooplankton growth
North Pacific
Issue Date: 2006
Publisher: Elsevier Ltd
Journal Title: Deep Sea Research Part II Topical Studies in Oceanography
Volume: 53
Issue: 20-22
Start Page: 2281
End Page: 2296
Publisher DOI: 10.1016/j.dsr2.2006.05.041
Abstract: A mesoscale iron-fertilization experiment was carried out in the eastern subarctic Pacific during summer 2002. The iron patch was traced for 26 days after the enrichment, and the abundance and behavior of mesozooplankton was compared with those outside of the patch during the first half of the experiment (days 2–18) by Sastri and Dower [2006. Mesozooplankton community response during the SERIES iron enrichment experiment in the subarctic NE Pacific. Deep-Sea Research Part II.) and during the post-enrichment diatom bloom and its period of decline (days 15–26; this paper). The surface chlorophyll-a concentration in the patch was high between days 15 and 17 (6 mg m−3) and decreased to 1.4 mg m−3 at the end of the observation. Dominant zooplankton species in the upper 200 m were copepods: Eucalanus bungii, Pseudocalanus spp., Neocalanus plumchrus, N. cristatus, and Metridia pacifica. Species composition did not change significantly in the patch over the observation period. However, shallower distribution depths of E. bungii, N. cristatus and M. pacifica were observed in the patch during and after the diatom bloom. Especially, E. bungii was mainly distributed in the subsurface layer outside of the patch, but it was mainly in the surface mixed layer inside the patch, where it also had an enhanced development rate and increased biomass. We also propose the accumulation mechanism of zooplankton in the patch due to the upward immigration. Moreover, the abundance of the first copepodite stage of E. bungii and calyptopis larvae of euphausiids increased several fold in the patch compared to the densities outside the patch. The increases in both species are considered to be due to lowered mortality during the egg and naupliar stages, which was caused by lowered relative importance of eggs and nauplii in the diets of the suspension-feeding omnivores in the patch due to increased diatom abundance during the diatom bloom. Gut-pigment contents of dominant copepods in the patch increased 6–8 times, and the maximum values were observed during the bloom peak. The grazing impact on phytoplankton was low during the bloom period, but increased in the declining period of the diatom bloom.
Relation: http://www.sciencedirect.com/science/journal/09670645
Type: article (author version)
URI: http://hdl.handle.net/2115/17204
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 工藤 勲

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