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北海道大学水産科学研究彙報 = Bulletin of Fisheries Sciences, Hokkaido University >
第71巻 第1号 >
Impacts of diel vertical migration of the copepod Metridia pacifica on primary production and respiratory carbon flux in the subarctic Pacific Ocean
Title: | Impacts of diel vertical migration of the copepod Metridia pacifica on primary production and respiratory carbon flux in the subarctic Pacific Ocean |
Authors: | Yamaguchi, Atsushi Browse this author →KAKEN DB |
Keywords: | Respiratory flux | Active carbon flux | Copepoda | Metridia pacifica |
Issue Date: | 3-Aug-2021 |
Publisher: | 北海道大学大学院水産科学研究院 |
Journal Title: | 北海道大学水産科学研究彙報 |
Journal Title(alt): | Bulletin of Fisheries Sciences, Hokkaido University |
Volume: | 71 |
Issue: | 1 |
Start Page: | 29 |
End Page: | 37 |
Abstract: | Respiratory oxygen consumption rates (at the two temperatures of 0-50 m and 50-200 m depth strata) and day/night biomass in the top 50 m water column were determined on adult female Metridia pacifica at twelve stations in the western/ eastern subarctic Pacific and one station in the oceanic Bering Sea during summer. At each station, the respiration rates at 0-50 m depth temperatures were used to estimate ingestion rates during nighttime by assuming empirical carbon budget efficiencies, and rates at 50-200 m to estimate respiratory carbon flux during daytime. The abundance of the females in the upper 50 m at night varied between 27 and 5,422 inds. m−2 and no specimen was collected from the same layer at daytime throughout the stations. The size of the females varied regionally from 25 to 77 μg C ind.−1. As a result, diel vertical migrant biomass of the females varied greatly from one station to the next (1 and 309 mg C m−2). Weight-specific respiration rates of the females were 2.2-6.3 μl O2 mg C−1 h−1, which was a function of experiment temperatures and body mass (C) of the females. Taking into
account of residence time at 0-50 m and 50-200 m in the day, daily population ingestion was estimated as 0.04-11.04 mg C m−2 day−1, which accounted for 0-2.4% of primary production at each station. Daily population respiration in the 50-200 m was calculated as 0.02-9.39 mg C m−2 day−1, which corresponds to 0-10% of the POC flux down from the euphotic zone. |
Type: | bulletin (article) |
URI: | http://hdl.handle.net/2115/82350 |
Appears in Collections: | 北海道大学水産科学研究彙報 = Bulletin of Fisheries Sciences, Hokkaido University > 第71巻 第1号
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