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北海道忍路湾におけるネット植物プランクトン群集の長期変動(1984-2004年)

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Title: 北海道忍路湾におけるネット植物プランクトン群集の長期変動(1984-2004年)
Other Titles: Long-term changes in the abundance and community structure of net-phyplankton in Oshoro Bay, Hokkaido
Authors: 福井, 大介1 Browse this author
北辻, さほ2 Browse this author
池田, 勉3 Browse this author →KAKEN DB
志賀, 直信4 Browse this author →KAKEN DB
山口, 篤5 Browse this author →KAKEN DB
Authors(alt): Fukui, Daisuke1
Kitatsuji, Saho2
Ikeda, Tsutomu3
Shiga, Naonobu4
Yamaguchi, Atsushi5
Keywords: Community structure
Long-term changes
Oshoro Bay
Phytoplankton
Regime shift
Issue Date: 26-Feb-2010
Publisher: 日本プランクトン学会
Journal Title: 日本プランクトン学会報
Volume: 57
Issue: 1
Start Page: 30
End Page: 40
Abstract: 地球温暖化の海洋生態系へ与える影響を理解する手段のひとつとして、歴史的資料を用いた気候変動と海洋構造の変化、それに伴う生物群集の応答についての長期モニタリングと解析が世界の様々な海域で現在行われている。北海道西部の日本海に面した石狩湾南西部に位置する忍路湾では、1947年から2004年まで長期にわたって定期的な海洋観測と植物プランクトン採集が行なわれ、その一部はすでに報告されている。本研究ではこれらの長期連続採集試料のうち、1984-2004年(21年間)の試料を用いて、植物プランクトンの種査定と細胞数密度の算出を行い、現存量(細胞数密度)と群集構造の長期変動と同湾の環境要因との関係を明らかにすることを目的とした。
Phytoplankton samplings with 0.1 mm mesh nets were made bi-weekly or monthly at Oshoro-Bay, western Hokkaido, during 1984 through 2004 (21 years). Sea surface temperature (SST), specific gravity (SG) and transparency (TRANS) were also determined at each sampling. Daylight length (DAYLIGHT) was available from Homepage of Meteological Agency. Throughout the study period, the abundance of phytoplankton ranged from 5.2 to 179,682 cells L^- 1 (grand mean: 3,037) in which centric diatoms were most abundant (mean: 79.5% of the total), followed by pennate diatoms (17.0%) and dinoflagellates (3.5%). The total number of species identified was 99 for centric diatoms, 35 for pennate diatoms and 23 for dinoflagellates. From a cluster analysis based on Bray-Curtis similarity index, phytoplankton communities were classified into five groups. With regards to long-term patterns, the regime shift (cool to warm) that occurred in 1989/1990 in the broader Northern Hemisphere was detected in the anomalies of SST and the total phytoplankton abundance, but was not reflected in the data for SG, TRANS or phytoplankton community structure. Rather, partial autocorrelation analysis for environmental factors (SST, SG, TRANS and DAYLIGHT) and phytoplankton abundance, and a cluster analysis for phytoplankton community structure revealed that the most predominant pattern was seasonal, reflecting local climate events with 12-month cycles.
Rights: © 2010 日本プランクトン学会
Type: article
URI: http://hdl.handle.net/2115/52513
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: 山口 篤

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