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1. Identity statement
Reference TypeJournal Article
Sitemtc-m21b.sid.inpe.br
Holder Codeisadg {BR SPINPE} ibi 8JMKD3MGPCW/3DT298S
Identifier8JMKD3MGP3W34P/3NNKT72
Repositorysid.inpe.br/mtc-m21b/2017/04.19.15.27   (restricted access)
Last Update2017:04.19.15.27.51 (UTC) administrator
Metadata Repositorysid.inpe.br/mtc-m21b/2017/04.19.15.27.51
Metadata Last Update2018:06.04.02.27.24 (UTC) administrator
DOI10.3389/fmars.2017.00026
ISSN2296-7745
Citation KeyGagne-MaynardWKSCNBLDVKKR:2017:EvPrPr
TitleEvaluation of primary production in the lower Amazon River based on a dissolved oxygen stable isotopic mass balance
Year2017
MonthFeb.
Access Date2024, May 19
Type of Workjournal article
Secondary TypePRE PI
Number of Files1
Size1846 KiB
2. Context
Author 1 Gagne-Maynard, William C.
 2 Ward, Nicholas D.
 3 Keil, Richard G.
 4 Sawakuchi, Henrique O.
 5 Cunha, Alan C. da
 6 Neu, Vania
 7 Brito, Daimio C.
 8 Less, Diani F. da Silva
 9 Diniz, Joel E. M.
10 Valério, Aline de Matos
11 Kampel, Milton
12 Krusche, Alex V.
13 Richey, Jeffrey E.
Resume Identifier 1
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11 8JMKD3MGP5W/3C9JHTG
Group 1
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10 SER-SRE-SESPG-INPE-MCTIC-GOV-BR
11 DIDSR-CGOBT-INPE-MCTIC-GOV-BR
Affiliation 1 University of Washington
 2 University of Washington
 3 University of Washington
 4 University of Washington
 5 Universidade Federal do Amapá (UFAP)
 6 Universidade Federal Rural da Amazonia (UFRAM)
 7 Universidade Federal do Amapá (UFAP)
 8 Universidade Federal do Amapá (UFAP)
 9 Universidade Federal do Amapá (UFAP)
10 Instituto Nacional de Pesquisas Espaciais (INPE)
11 Instituto Nacional de Pesquisas Espaciais (INPE)
12 Universidade de Săo Paulo (USP)
13 University of Washington
Author e-Mail Address 1
 2 nicholas.ward@pnnl.gov
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11 milton.kampel@inpe.br
JournalFrontiers in Marine Science
Volume4
History (UTC)2017-04-19 15:30:13 :: simone -> administrator :: 2017
2018-06-04 02:27:24 :: administrator -> simone :: 2017
3. Content and structure
Is the master or a copy?is the master
Content Stagecompleted
Transferable1
Content TypeExternal Contribution
Version Typepublisher
KeywordsMass balance
Oxygen
Photosynthesis
Respiration
Tropical rivers
AbstractThe Amazon River outgasses nearly an equivalent amount of CO2 as the rainforest sequesters on an annual basis due to microbial decomposition of terrigenous and aquatic organic matter. Most research performed in the Amazon has been focused on unraveling the mechanisms driving CO2 production since the recognition of a persistent state of CO2 supersaturation. However, although the river system is clearly net heterotrophic, the interplay between primary production and respiration is an essential aspect to understanding the overall metabolism of the ecosystem and potential transfer of energy up trophic levels. For example, an efficient ecosystem is capable of both decomposing high amounts of organic matter at lower trophic levels, driving CO2 emissions, and accumulating energy/biomass in higher trophic levels, stimulating fisheries production. Early studies found minimal evidence for primary production in the Amazon River mainstem and it has since been assumed that photosynthesis is strongly limited by low light penetration attributed to the high sediment load. Here, we test this assumption by measuring the stable isotopic composition of O2 (δ18O-O2) and O2 saturation levels in the lower Amazon River from óbidos to the river mouth and its major tributaries, the Xingu and Tapajós rivers, during high and low water periods. An oxygen mass balance model was developed to estimate the input of photosynthetic oxygen in the discrete reach from óbidos to Almeirim, midway to the river mouth. Based on the oxygen mass balance we estimate that primary production occurred at a rate of 0.39 ± 0.24 g O m3 d-1 at high water and 1.02 ± 0.55 g O m3 d-1 at low water. This translates to 41 ± 24% of the rate of O2 drawdown via respiration during high water and 67 ± 33% during low water. These primary production rates are 2-7 times higher than past estimates for the Amazon River mainstem. It is possible that at high water much of this productivity signal is the result of legacy advection from floodplains, whereas limited floodplain connectivity during low water implies that most of this signal is the result of in situ primary production in the Amazon River mainstem.
AreaSRE
Arrangement 1urlib.net > BDMCI > DIDSR > Evaluation of primary...
Arrangement 2urlib.net > SER > Evaluation of primary...
doc Directory Contentaccess
source Directory Contentthere are no files
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4. Conditions of access and use
Languageen
Target Filegagne_evaluation.pdf
User Groupsimone
Reader Groupadministrator
simone
Visibilityshown
Read Permissiondeny from all and allow from 150.163
Update Permissionnot transferred
5. Allied materials
Next Higher Units8JMKD3MGPCW/3ER446E
8JMKD3MGPCW/3F3NU5S
Citing Item Listsid.inpe.br/mtc-m21/2012/07.13.14.56.38 1
sid.inpe.br/bibdigital/2013/10.18.22.34 1
DisseminationPORTALCAPES; SCOPUS.
Host Collectionsid.inpe.br/mtc-m21b/2013/09.26.14.25.20
6. Notes
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