Spring Tide Hypoxia with Relation to Chemical Properties of the Sediments in the Matang Mangrove Estuary, Malaysia

Japan Agricultural Research Quarterly
ISSN 00213551
NII recode ID (NCID) AA0068709X
Full text
44-03-13.pdf952.61 KB

The dissolved oxygen concentrations (DO) were measured during four expeditions between 2007 and 2008 in the Sangga Besar River Estuary in the Matang Mangrove Forest Reserve (MMFR), Peninsular Malaysia. Hypoxic conditions (DO < 3 mg/L) were observed during periods of well mixed spring tides almost throughout the estuary, while in the partially stratified neap tides, hypoxia in the estuary was restricted to the upper river and subsurface layers in the branch and creek area, where high Acid Volatile Sulfide and low oxidation-reduction potential values were observed in the surface sediments due to the accumulation and decomposition of mangrove derivedorganic matter. Basedonthe δ13C, the contribution of mangrove derived organic matter in the surface sediments of the creek area was estimated to be 77-87%. While in the coastal area, the contribution of phytoplankton was 58-68%. These results indicate that the formation of hypoxic waters in the estuary is mainly due to the tidal mixing of hypoxic waters from the creeks and branches with the estuarine waters during spring tides and probably oxygen consumption by resuspended sediments.

Date of issued
Creator OKAMURA Kazumaro TANAKA Katsuhisa SIOW Ryon MAN Alias KODAMA Masashi ICHIKAWA Tadafumi

dissolved oxygen

stable isotope

tidal mixing

Publisher Japan International Research Center for Agricultural Sciences
Available Online
NII resource type vocabulary Journal Article
Volume 44
Issue 3
spage 325
epage 333
DOI 10.6090/jarq.44.325
Rights Japan International Research Center for Agricultural Sciences
Language eng

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