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Title Transcription
DICTYOCHAEAE PEDIASTRUM ノ シュツゲン ケイコウ カラ ミタ ヨドエ ヘイヤ ノ チュウキ カンシンセイ コカンキョウ ヘンセン
Title Alternative (English)
Holocene Paleoenvironmental Change in Yodoe Plain Tottori Prefecture, Southwest Japan, Based on the Analyses of Planktic microfossils Dictyochaeae and Pediastnum
File
language
jpn
Author
Arakawa, Yoshitake
Tokuoka, Takao
Watanabe, Masami
Description
Relative abundances of marine plankton Dictypochaeae and freshwater plankton Pediastrum were systematically determined from a drill core through Holocene sediments in Yodoe Plain, to decipher environmental changes in the Paleo-Yodoe Lake. Compared with the difficult and time-consuming diatom assemblage analysis normally used, the above method offers a simple but valuable method for the study of environmental changes in brackish lakes, as the two species concerned are easy to identify under the microscope due to their characteristic features. Chemical analyses of TOC, TN, C/N, TS and C/S were also made from the same core. It is well-known that total sulfer(TS)and carbon-nitrogen ratio(C/N)are sensitive indicators of freshwater-brackish-marine conditions. Environmental indicators from the chemistry are compatible with those derived from the plankton abundances.
Subject
chemical analysis
paleoenvironment
Dictyochaeae-analysis
Pediastrum-analysis
Yodoe plain
Journal Title
Laguna : 汽水域研究
Volume
7
Start Page
23
End Page
28
ISSN
21852995
Published Date
2000-03
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