Article Per Year (5 Year)
p-Index From 2020 - 2025
0
P-Index
This Author published in this journals
All Journal JOURNAL OF COASTAL DEVELOPMENT
Toshiaki Irizuki
Unknown Affiliation
Education

Published : 1 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 1 Documents
Search

 1 
VERTICAL CHANGES OF RECENT OSTRACODE ASSEMBLAGES AND ENVIRONMENT IN THE INNER PART OF JAKARTA BAY, INDONESIA Lili Fauzielly; Toshiaki Irizuki; Yoshikazu Sampei
JOURNAL OF COASTAL DEVELOPMENT Vol 16, No 1 (2012): Volume 16, Number 1, Year 2012
Publisher : JOURNAL OF COASTAL DEVELOPMENT

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (829.085 KB)

Abstract

A short sediment core from the inner part of Jakarta Bay, Indonesia, was quantitatively analysed for ostracods (minute Crustacea), total organic carbon (TOC) and total nitrogen (TN) contents, and the vertical distributions were recorded. A total of 53 ostracod species were obtained from 80 continuous core samples. The dominant species were Keijella carriei and Loxoconcha wrighti, which are common in areas with high TOC and TN contents. Based on an analysis of ostracod assemblages and carbon/nitrogen ratio, the study site began to be influenced by organic contamination from around 1950. Although the population of Jakarta City has increased rapidly since then, TOC and TN contents which were low, have gradually increased (0.7%–0.9% and 0.10%–0.12%, respectively), probably due to addition of nutrients from river sedimentation. The increased sedimentation rate after 1950 resulted in an increasing TOC ratio. The observed correlation between TOC and dominant species shows that Phlyctenophora orientalis may be a good indicator for monitoring increases in the narrow TOC content range of 0.7%–1.1%.
Co-Authors Lili Fauzielly Yoshikazu Sampei