Use of multitracers for the study of water mixing in the Paraíba do Sul River estuary

Souza, Thaísa Abreu; Godoy, José Marcus; Godoy, Maria Luiza D.P.; Moreira, Isabel; Carvalho, Zenildo Lara de; Salomão, Marcos Sarmet M.B.; Rezende, Carlos Eduardo de

doi:10.1016/j.jenvrad.2009.11.001

Cited by 46 publications

(27 citation statements)

References 31 publications

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“…This area is influenced by the Paraíba do Sul river discharge, whose flux can vary from 180 m during the rainy season (October-March) (Carvalho et al, 2002). The river plume reaches the ocean waters in velocities of 1.6 and 2.6 km d -1 during dry and rainy seasons, respectively (Souza et al, 2010). In this marine coastal area, the surface water temperature ranging from 21 to 24ºC (Laboratório de Ciências Ambientais, unpublished data).…”

Section: Methodsmentioning

confidence: 99%

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Mercury and stable isotopes (δ15N and δ13C) as tracers during the ontogeny of Trichiurus lepturus

et al. 2013

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This study applies total mercury (THg) concentration and stable isotope signature (δ15N and δ13C) to evaluate the trophic status and feeding ground of Trichiurus lepturus during its ontogeny in northern Rio de Janeiro, south-eastern Brazil. The trophic position of T. lepturus is detected well by THg and δ15N as the sub-adult planktivorous specimens are distinct from the adult carnivorous specimens. The δ13C signatures suggest a feeding ground associated with marine coastal waters that are shared by fish in different ontogenetic phases. The diet tracers indicated that the fish feeding habits do not vary along seasons of the year, probably reflecting the prey availability in the study area. This fish has economic importance and the concentration of THg was compared to World Health Organization limit, showing that the adult specimens of T. lepturus are very close to the tolerable limit for safe regular ingestion.

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Section: Methodsmentioning

confidence: 99%

“…In this marine coastal area, the surface water temperature ranging from 21 to 24ºC (Laboratório de Ciências Ambientais, unpublished data). The salinity varied from 18 (around 1 km far from the river mouth) to 35-36 (more than 10 km far from the river mouth) (Souza et al, 2010).…”

Section: Methodsmentioning

confidence: 99%

Mercury and stable isotopes (δ15N and δ13C) as tracers during the ontogeny of Trichiurus lepturus

et al. 2013

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“…The main source of Hg to coastal marine species in the study area is a river discharge. This area is permanently infl uenced by the Paraíba do Sul River (Souza et al 2010), whose basin was widely impacted with practices of gold-mining and use of mercurial fungicides on plantations until 1980's (Lacerda et al 1993).…”

Section: Discussionmentioning

confidence: 99%

Mercury bioaccumulation and isotopic relation between Trichiurus lepturus (Teleostei) and its preferred prey in coastal waters of southeastern Brazil

Bittar

Rezende

Kehrig

et al. 2016

An. Acad. Bras. Ciênc.

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The trophic transfer of total mercury (THg) and its bioaccumulation from prey species to the predator fi sh Trichiurus lepturus was analysed in coastal waters of southeastern Brazil to evaluate the trace element dynamic in this predator-prey system. The isotopic (δ 13 C and δ 15 N) relation between this predator and its prey allowed inferences on prey assimilation and predator feeding habits. The THg increment varied from 4.5 to 19.5 times between prey and predator, with a biomagnifi cation power of 0.59. The prey species could be divided into three groups regarding δ N highlighted juvenile conspecifi cs as the main via of this trace element and the most assimilated prey. The isotopic relation between predator and its prey species showed a feeding activity preferably coastal and pelagic.

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“…The highest is during the rainy summer season (November to March), with a maximum of 4400 m 3 s −1 (Ref. 22). …”

Section: Site Location and Descriptionmentioning

confidence: 99%

“…These too have important roles in the coastal ecosystem, and may affect a much larger area, as they have lower sinking rates and can travel much farther from the river sediment plume boundary. 1 Souza et al 22 studied the distance that the PSR plume can achieve offshore, by radioactive tracers. They encountered a distance of the river influence up to 32 km from the coast in the east direction during the rainy season.…”

Section: Temporal Analysismentioning

confidence: 99%

Spectral mapping of the Paraíba do Sul River plume (Brazil) using multitemporal Landsat images

Rudorff

Kampel

Rezende

2011

J. Appl. Remote Sens

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Abstract. Coastal zones are influenced by oceanic, atmospheric, and continental forces, which make them highly vulnerable to climate and anthropogenic changes. The Paraíba do Sul River (PSR) Estuary (Brazil), is especially affected by intensive industrial, urban, and rural activities, along its catchment area. Few works, though, have been done concerning the impacts of these changes. Remote sensing is, thus, an important and unique tool to assess the past scenes for a temporal analysis. The present work aimed to analyze spatial-temporal trends of the PSR plume from 1985 to 2009, using Landsat 5 TM images. Two spectral classification methods were used to map the river plume: maximum likelihood and spectral linear mixture analysis (SLMA). The images corresponded to the months of greatest river discharge, totalizing 11 cloud-free images. Geographical, radiometric, and atmospheric corrections were applied to the five spectral bands used for the classification. Both methods showed good results, however the SLMA provided more information of the water constituent's distribution. The sediment river plume and inner shelf phytoplankton dominated waters showed a negative trend associated with a diminishing of the river discharge. Further works concern in situ validation of the classifications, biooptical modeling, and more investigations of climate and anthropogenic changes on the PSR.C 2011 Society of Photo-Optical Instrumentation Engineers (SPIE).

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Use of multitracers for the study of water mixing in the Paraíba do Sul River estuary

Cited by 46 publications

References 31 publications

Mercury and stable isotopes (δ15N and δ13C) as tracers during the ontogeny of Trichiurus lepturus

Mercury and stable isotopes (δ15N and δ13C) as tracers during the ontogeny of Trichiurus lepturus

Mercury bioaccumulation and isotopic relation between Trichiurus lepturus (Teleostei) and its preferred prey in coastal waters of southeastern Brazil

Spectral mapping of the Paraíba do Sul River plume (Brazil) using multitemporal Landsat images

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