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DECOMPOSITION AND RECYCLING OF ORGANIC-MATTER IN MUDS OF THE GULF OF PAPUA, NORTHERN CORAL SEA

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dc.contributor Australian Institute Of Marine Science (aims) en
dc.contributor Australian Inst Marine Sci
dc.contributor Australian Institute Of Marine Science
dc.contributor.author ALONGI, DM
dc.date.accessioned 2013-02-28T06:53:46Z
dc.date.accessioned 2013-02-28T06:53:46Z
dc.date.accessioned 2017-03-21T01:18:53Z
dc.date.accessioned 2018-11-01T03:06:36Z
dc.date.available 2013-02-28T06:53:46Z
dc.date.available 2017-03-21T01:18:53Z
dc.date.available 2017-03-21T01:18:53Z
dc.date.available 2018-11-01T03:06:36Z
dc.date.issued 1995-09-01
dc.identifier 2568 en
dc.identifier.citation Alongi DM (1995) Decomposition and recycling of organic matter in muds of the Gulf of Papua, northern Coral Sea. Continental Shelf Research. 15: 1319-1337. en
dc.identifier.issn 0278-4343
dc.identifier.uri http://epubs.aims.gov.au/11068/2568
dc.description.abstract Most sediment and organic material transported from rivers of southern Papua New Guinea enters into the Gulf of Papua, depositing on the inner shelf as either laminated or bioturbated, silt-dominated mud. These facies are the major trawling grounds for a growing penaeid prawn fishery. In contrast to most other terrigenous shelf deposits, decomposition processes in the upper 20 cm of these Papuan silts are apparently dominated by oxic and suboxic 26 diagenesis. Rates of surface oxygen consumption were high (mean = 26.9; range = 17.8-46.8 mmol O-2 m(-2) d(-1)) as were bacterial numbers (range: 1-4 x 10(10) cells g(-1) DW) and rates of bacterial carbon production (tritiated thymidine uptake; range: 3-10 gC m(-2) d(-1)). Rates of sulfate reduction were low (range: 3.6-6.8 mmol S m(-2) d(-1)) with little (18-25%) of the total reduced (SO4)-S-35 recovered as acid-volatile sulfide. Free sulfides were not detected in porewaters. Total solid-phase S concentrations were low (0.15-0.20% DW) indicating low net S precipitation in the upper 20 cm. Concentrations of dissolved Fe and Mn were elevated in porewaters in the laminated silts. Solid-phase Fe concentrations were moderately high (range: 4.6-5.3% DW) and measured dissolved metal and nutrient fluxes suggest active Fe and Mn reduction (at some stations) and generally high turnover of the porewater N pools. The domination of oxidants other than sulfate and probable C limitation in these moderately Fe-rich silts, results in a SIC signature comparable to freshwater sediments. These diagenetic patterns are reminiscent of those measured in muds on the Amazon shelf and may similarly be attributed to dilution of reactive organic matter combined with intense physical reworking and/or bioturbation, promoting oxidant recharge and favoring decomposition processes other than sulfate reduction. Rapid rates of detrital decomposition lead to fast rates of benthic nutrient release that contribute, on average, 71% and 35% of the daily N and P requirements of shelf phytoplankton production. This close benthic-pelagic coupling may serve to maintain the penaeid prawn fishery in the Gulf of Papua.
dc.language English
dc.language en en
dc.relation.ispartof Null
dc.relation.ispartof Continental Shelf Research - pages: 15: 1319-1337 en
dc.relation.uri http://data.aims.gov.au/metadataviewer/uuid/07f36fab-f442-4b64-b2a7-494f0a53417d en
dc.subject Diagenesis
dc.subject Coastal Waters
dc.subject Marine-sediments
dc.subject Sulfate Reduction
dc.subject Sulfur-compounds
dc.subject Iron Reduction
dc.subject Continental-shelf
dc.subject Oceanography
dc.subject Carbon Oxidation
dc.subject Fly-delta
dc.subject New-guinea
dc.title DECOMPOSITION AND RECYCLING OF ORGANIC-MATTER IN MUDS OF THE GULF OF PAPUA, NORTHERN CORAL SEA
dc.type journal article en
dc.identifier.wos WOS:A1995RC36500002


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