Preliminary Report on Stable Isotope Ratio Analysis for Samples from Matang Mangrove Brackish Water Ecosystems

Japan Agricultural Research Quarterly
ISSN 00213551
NII recode ID (NCID) AA0068709X
Full text

The stable carbon and nitrogen isotope ratios of mangrove leaves, particulate organic matter (POM), shrimps and crabs, squids and fishes were studied for tracing the actual food web structure in the Matang mangrove brackish water ecosystems. Carbon isotope ratio of POM showed a positive correlation with the level of salinity, suggesting that POM around the mouth to mudflat areas of the river may consist of phytoplankton-derived detritus from the sea, whereas POM from mid- to upstream areas of the river may consist of mangrove-derived detritus. δ13C-δ15N map showed a C-N isotope ratio gradient with the lowest value with mean (±SD) of δ13C (-28.74±0.031‰) and δ15N (4.36±0.15‰) for a mangrove leaf (Rhizophora apiculata), the highest value of δ13C (-20.45±0.026‰) for a squid (Loligo duvaucelii) and of δ15N (13.63±0.021‰) for a fish (Stolephorus commersonii). Penaeid shrimps (Penaeus merguiensis, Metapenaeus brevicornis and M. ensis) and mangrove crabs (Scylla serrata) showed intermediate C-N values between those of mangrove leaves and fish/squid.

Date of issued
Creator Shigeo HAYASE Tadafumi ICHIKAWA Katsuhisa TANAKA
Available Online
NII resource type vocabulary Journal Article
Volume 33
Issue 3
spage 215
epage 221
Language eng

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