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Authors Mwashote, BM; Jumba, IO
Author Full Name Mwashote, BM; Jumba, IO
Title Quantitative aspects of inorganic nutrient fluxes in the Gazi Bay (Kenya): implications for coastal ecosystems
Source MARINE POLLUTION BULLETIN
Language English
Document Type Article
Author Keywords Gazi bay; nutrient sources; benthic fluxes; fluvial discharge; community production; coastal ecosystems
Keywords Plus SEDIMENT-WATER INTERFACE; MANGROVE VEGETATION; BOTTOM SEDIMENTS; TERMINOS LAGOON; HUMBER ESTUARY; EXCHANGE; NITROGEN; MEXICO; DENITRIFICATION; BIOGEOCHEMISTRY
Abstract Fluxes of dissolved inorganic nutrients: NHI4+, NO2-, NO3-, PO43- and Si(OH)(4) from nearshore sediments of Gazi Bay were measured in situ within mangrove, seagrass and coral reef biotopes using benthic flux bell-jar chambers of cross-sectional area 0.066 m(2) and volume 0.0132 m(3). The objectives were: (1) to determine the influence of benthic fluxes, fluvial discharge and seasonal variations on the nutrient budget in the Bay waters; (2) to determine the effect of tidal and spatial variations on nutrient loads in the water column and (3) to establish the relative importance of the nutrient sources with regard to total community production of the Bay. The directly measured fluxes ranged from -270 to +148 mumol NH4+-N/m(2)/h; -60 to +63 mumol NO2--N/m(2)/h; -79 to +41 mumol NO3--N/m(2)/h; -79 to +75 mumol PO43--P/m(2)/h and +30 to +350 mumol Si(OH)(4)-Si/m(2)/h for and respectively. It was established that benthic fluxes are the major sources of dissolved inorganic NH4+, NO2- and Si(OH)(4) while fluvial sources are important for NO3- and PO43- into Gazi Bay waters. Seasonal variations had an appreciable effect on the PO43- fluxes, N:Si ratio, river nutrient discharge, plankton productivity and important environmental factors such as salinity and temperature. Tidal and spatial variations had no significant effect on nutrient concentrations and net fluxes within the water column. The results imply that benthic fluxes are largely responsible for the nutrient dynamics of the nearshore coastal ecosystems especially where direct terrestrial inputs do not contribute significantly to the nutrient budget. (C) 2002 Elsevier Science Ltd. All rights reserved.
Author Address Kenya Marine & Fisheries Res Inst, Mombasa, Kenya; Univ Nairobi, Dept Chem, Nairobi, Kenya
Reprint Address Mwashote, BM (corresponding author), Kenya Marine & Fisheries Res Inst, POB 81651, Mombasa, Kenya.
E-mail Address bmwashote@recoscix.org
Times Cited 12
Total Times Cited Count (WoS, BCI, and CSCD) 15
Publisher PERGAMON-ELSEVIER SCIENCE LTD
Publisher City OXFORD
Publisher Address THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
ISSN 0025-326X
29-Character Source Abbreviation MAR POLLUT BULL
ISO Source Abbreviation Mar. Pollut. Bull.
Publication Date NOV
Year Published 2002
Volume 44
Issue 11
Beginning Page 1194
Ending Page 1205
Article Number PII S0025-326X(02)00176-5
Digital Object Identifier (DOI) 10.1016/S0025-326X(02)00176-5
Page Count 12
Web of Science Category Environmental Sciences; Marine & Freshwater Biology
Subject Category Environmental Sciences & Ecology; Marine & Freshwater Biology
Document Delivery Number 625TJ
Unique Article Identifier WOS:000179831400013
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