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Primary production and nutrients in a tropical macrotidal estuary, Darwin Harbour, Australia

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dc.contributor Australian Institute Of Marine Science
dc.contributor Australian Rivers Inst
dc.contributor Griffith Univ
dc.contributor Australian Inst Marine Sci
dc.contributor Griffith University
dc.contributor Australian Institute Of Marine Science (aims) en TROTT, L. A. BURFORD, M. A. ALONGI, D. M. MCKINNON, A. D. 2017-03-21T01:19:12Z 2013-02-28T06:53:51Z 2013-02-28T06:53:51Z 2019-07-08T02:28:29Z 2013-02-28T06:53:51Z 2013-02-28T06:53:51Z 2017-03-21T01:19:12Z 2019-07-08T02:28:29Z 2008-09-10
dc.identifier 7664 en
dc.identifier.citation Burford M, Alongi DM, McKinnon AD and Trott LA (2008) Primary production and nutrients in a tropical macrotidal estuary, Darwin Harbour, Australia. Estuarine Coastal and Shelf Science. 79(3): 440-448. en
dc.identifier.issn 0272-7714
dc.description Link to abstract/full text - en
dc.description.abstract Tropical estuaries are under increasing pressure worldwide from human impacts, but are poorly studied compared with temperate systems. This study examined a tropical macrotidal estuary, Darwin Harbour, in northern Australia, using a combination of direct measurements and literature values to determine the main sources of primary production and the sources of nutrients supporting growth. The main source of primary production was calculated to be the extensive area of fringing mangroves and resulted in a net autotrophic system (P-G:R = 2.1). Much of the carbon in the mangrove forests appears to be retained within the forests or respired, as the water column was also net autotrophic despite the carbon inputs. Phytoplankton were the second largest primary producer on a whole-of-harbour basis, with low biomass constrained by light and nutrient availability. The phytoplankton were likely to be nitrogen (N) limited, based on low N:phosphorus (P) ratios, low dissolved bioavailable N concentrations (ammonium (NH4+), nitrate (NO3-), urea), and evidence that phytoplankton growth in bioassays was stimulated by NH4+ addition. The largest new source of N to the system was from the ocean due to higher N concentrations in the incoming tides than the outgoing tides. Atmospheric inputs via N fixation on the intertidal mudflats and subtidal sediments were substantially lower. The rivers feeding into the harbour and sewage were minor N inputs. Nitrogen demand by primary producers was high relative to available N inputs, suggesting that N recycling within the water column and mangrove forests must be important processes. Darwin Harbour is adjacent to the rapidly growing urban area of Darwin city, but overall there is no evidence of anthropogenic nutrient inputs having substantial effects on primary production in Darwin Harbour. Crown Copyright (C) 2008 Published by Elsevier Ltd. All rights reserved.
dc.description.uri en
dc.language English
dc.language en en
dc.relation.ispartof Null
dc.relation.ispartof Estuarine Coastal and Shelf Science - pages: 79(3): 440-448 en
dc.relation.uri en
dc.subject Chesapeake Bay
dc.subject Primary Productivity
dc.subject Metabolism
dc.subject Nutrient Fluxes
dc.subject River
dc.subject Nitrogen-fixation
dc.subject King Sound
dc.subject Mangrove Productivity
dc.subject Marine & Freshwater Biology
dc.subject Limitation
dc.subject Oceanography
dc.subject Environment
dc.subject Carbon
dc.subject Northwestern Australia
dc.subject Phytoplankton Growth
dc.title Primary production and nutrients in a tropical macrotidal estuary, Darwin Harbour, Australia
dc.type journal article en
dc.identifier.doi 10.1016/j.ecss.2008.04.018
dc.identifier.wos WOS:000259731900010

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