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Title Transcription
コスイ カンキョウ ノ ジンイテキ カイゾウ ト テイセイ ユウコウチュウ ノ グンシュウ ヘンカ ソノ6 エンブン ヤクソウ ニ ソウトウスル スイシン デノ AMMONIA イベント ノ カクニン
Title Alternative
Benthic Foraminiferal Changes in Relation to Human Activities(Part 6) : Discovery of the Ammonia Event at Halocline Depth
File
language
jpn
Author
Nomura, Ritsuo
Fukuda, Takahiro
Description
Benthic foraminifera have significantly changed their main constituents in the last three decades, in association with brackish environmental changes in two Lakes Shinjiko and Nakaumi. The Ammonia event, indicating a replacement of previously developed Haplophragmoides canariensis with recently developed Ammonia beccarii, was discovered at 3.0-4.0 cm sub-bottom depths of sediment cores obtained at 3.0-4.5 m water depths of Lake Nakaumi. These water depths are correlated with a halocline developed in this lake and are important to reconstruct the recent history of the relationships between the shallower and deeper parts of Lake Nakaumi. Thus, the discovery of the Ammonia event indicates that the sediment-water interface has changed not only in deeper area, but also in shallower area in recent years.
We suggest that the recent increase of Ammonia indicates a progressive loading of orgainc matter in the shallower area of Lake Nakaumi.
Subject
Ammonia event
foraminifera
halocline
Lake Nakaumi
Journal Title
Laguna : 汽水域研究
Volume
6
Start Page
119
End Page
122
ISSN
21852995
Published Date
1999-03
NCID
AN10439529
Publisher
島根大学汽水域研究センター
NII Type
Departmental Bulletin Paper
Format
PDF
Text Version
出版社版
OAI-PMH Set
Estuary Research Center
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