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      Integrated assessment of contaminants and monitoring of an urbanized temperate harbor (Montevideo, Uruguay): a 12-year comparison

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          Abstract

          AbstractSituated opposite the Freshwater Front, Montevideo city with its more than 1.5 million inhabitants encircles Montevideo Bay, where one of the most active and polluted harbors in South America is located. Faecal sterols, trace metals, organochlorine compounds and petroleum derivatives in the sediments of Montevideo Harbor were evaluated and their spatial distribution inside the harbor as well as in the input of two main tributary streams analyzed. Specifically for the harbor sites, a temporal comparison of metal and hydrocarbons was made with previous measurements taken 12 years ago. Clear changes were observed at these sites. The concentration of metals such as Pb, Cr and Zn have diminished, while aliphatic hydrocarbons have increased their values at almost all of the stations studied. Differences were observed between summer and winter suggesting sedimentation, input or hydrodynamic changes in the area. These results help one to understand the present situation and develop the management measures needed to improve the environmental quality of the harbor and bay.

          Translated abstract

          ResumoA cidade de Montevidéu, com mais de 1,5 milhões de habitantes, circunda a Baía de Montevidéu, onde um dos portos mais ativos e poluídos da América do Sul está localizado. No presente trabalho, foram avaliados esteróis fecais, metais traço, compostos organoclorados e derivados de petróleo nos sedimentos superficiais do Porto de Montevidéu, analisando sua distribuição espacial no interior do porto, bem como em dois dos principais tributários que chegam ao interior da baía. Especificamente para os sítios do porto, foi realizada uma comparação temporal dos metais pesados e hidrocarbonetos, considerando dados pretéritos de 12 anos. Foram observadas alterações significativas nos sítios estudados. Metais, tais como o Pb, Cr e Zn, apresentaram redução nas suas concentrações, enquanto os hidrocarbonetos alifáticos aumentaram seus valores em quase todas as estações. Foram observadas também diferenças entre o verão e o inverno, sugerindo mudanças no padrão de sedimentação, nos ingressos de substâncias e/ou mudanças hidrodinâmicas na área. Os resultados podem vir auxiliar na compreensão do estado atual e para o desenvolvimento de medidas de gestão necessárias para melhorar a qualidade ambiental do porto e da baía.

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          Depletion, degradation, and recovery potential of estuaries and coastal seas.

          Estuarine and coastal transformation is as old as civilization yet has dramatically accelerated over the past 150 to 300 years. Reconstructed time lines, causes, and consequences of change in 12 once diverse and productive estuaries and coastal seas worldwide show similar patterns: Human impacts have depleted >90% of formerly important species, destroyed >65% of seagrass and wetland habitat, degraded water quality, and accelerated species invasions. Twentieth-century conservation efforts achieved partial recovery of upper trophic levels but have so far failed to restore former ecosystem structure and function. Our results provide detailed historical baselines and quantitative targets for ecosystem-based management and marine conservation.
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            Determination of protein: a modification of the Lowry method that gives a linear photometric response.

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              PAHs in the Fraser River basin: a critical appraisal of PAH ratios as indicators of PAH source and composition

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
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                Role: ND
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                Journal
                bjoce
                Brazilian Journal of Oceanography
                Braz. j. oceanogr.
                Universidade de São Paulo, Instituto Oceanográfico (São Paulo )
                1982-436X
                September 2015
                : 63
                : 3
                : 311-330
                Affiliations
                [1 ] Universidad de la República Uruguay
                [2 ] Universidade Federal do Paraná Brazil
                [3 ] Centre of Environmental Studies of Pakistan Pakistan
                [4 ] Universidade de São Paulo Brazil
                [5 ] Universidad de la República Uruguay
                Article
                S1679-87592015000300311
                10.1590/S1679-87592015088506303
                a09633be-4ba1-4dce-8d42-4e1f2ec3ed9e

                http://creativecommons.org/licenses/by/4.0/

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                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=1679-8759&lng=en
                Categories
                MARINE & FRESHWATER BIOLOGY
                OCEANOGRAPHY

                Oceanography & Hydrology,Ecology
                Poluentes orgânicos e inorgânicos,Sedimentos,Estuário,Monitoramento,Rio da Prata,Organic and inorganic pollutants,Sediment,Estuary,Pollution monitoring,Río de la Plata

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