Papers by Denis Moledo Souza Abessa
O Mundo da Saúde, 2012
Os sistemas de disposição oceânica de esgotos domésticos, ou emissários submarinos, têm sido hist... more Os sistemas de disposição oceânica de esgotos domésticos, ou emissários submarinos, têm sido historicamente utilizados em todo o mundo como solução para destinação final de efluentes urbanos, principalmente devido aos aspectos econômicos. Porém, o descarte no oceano, seja em águas rasas ou mais profundas, pode induzir uma série de impactos ambientais negativos, dos quais se destacam a eutrofização, a floração de algas tóxicas, a introdução de microrganismos patogênicos e a contaminação por substâncias químicas capazes de produzir efeitos tóxicos sobre a biota e bioacumulação. Desse modo, o lançamento de esgoto não tratado no mar não constitui uma prática ambientalmente adequada, sendo necessário o tratamento dos efluentes de forma a remover nutrientes, contaminantes e organismos patogênicos e evitar a degradação ambiental.
Dinâmica da paisagem do município de Cubatão: crescimento entre portos, indústrias e a Serra do M... more Dinâmica da paisagem do município de Cubatão: crescimento entre portos, indústrias e a Serra do Mar Dynamics of the landscape of the city of Cubatão: growth among shores, industry facilities and the mountain range Serra do Mar Dinámica del paisaje de la ciudad de Cubatão: el crecimiento entre puertos, instalaciones industriales y la Serra del Mar
O Mundo da saúde, Mar 30, 2011
Dinâmica da paisagem do município de Cubatão: crescimento entre portos, indústrias e a Serra do M... more Dinâmica da paisagem do município de Cubatão: crescimento entre portos, indústrias e a Serra do Mar Dynamics of the landscape of the city of Cubatão: growth among shores, industry facilities and the mountain range Serra do Mar Dinámica del paisaje de la ciudad de Cubatão: el crecimiento entre puertos, instalaciones industriales y la Serra del Mar
Brazilian Journal of Animal and Environmental Research, Oct 14, 2021
Rivers protection is fundamental for the socioecological systems, and the benthic macroinvertebra... more Rivers protection is fundamental for the socioecological systems, and the benthic macroinvertebrates communities can be used to assess the quality of river waters. This study aimed to assess the water quality at the "Cachoeira do Paraíso" waterfall, Peruíbe, SP, based on the benthic macrofauna. Sampling took place at 3 sampling sites, under different levels of anthropic influence. Water physical-chemical and sedimentological parameters were evaluated, as well as macrobenthic organisms. Samplings were done by kick sampling technique. The organisms were identified at the lowest possible taxonomic level and points were attributed to each group according to their respective sensitivity and tolerance to pollutants. Then, a biological index was calculated to indicate the water quality. Ecological indices were calculated and compared using ANOVA. The water physical-chemical parameters showed to be within the legal standards. 13 taxonomic groups of benthic macroinvertebrates were identified, with the Shannon diversity indices indicating similar taxonomic diversity. The score given to each taxa generated biological indices for each sample, ranging from regular to excellent. Diptera (with head) I was the most representative taxon, and sensitive taxonomic groups, were found in all the sampling sites, suggesting a good quality of the water body during the period of study.
Preliminary laboratorial studies of survival of tiburonella viscana exposed to santos sediment
Earlier biomarkers in fish evidencing stress responses to metal and organic pollution along the Doce River Basin
Environmental Pollution, Jul 1, 2023
Brazilian Journal of Oceanography, 2001
International Journal of Oceanography, Jul 31, 2012
Nowadays, organisms are increasingly being used in biomonitoring to assess bioavailability and bi... more Nowadays, organisms are increasingly being used in biomonitoring to assess bioavailability and bioaccumulation of contaminants. This approach can use both native and transplanted organisms in order to accomplish this task. In Brazil, most of the studies related to bioaccumulation of contaminants in oysters deal with metals. The present work employs this kind of test in Brazilian coastal estuaries (Santos and Paranaguá) to evaluate total mercury and polycyclic aromatic hydrocarbon contamination in sediments and oysters (native and caged Crassostrea rhizophorae). The methodologies employed were based on known USEPA methods. Results have shown a significant contamination in Santos sediments and consequent bioavailability of organisms. Paranaguá sediments presented lower contamination in sediments, but native oysters were able to accumulate total Hg. The experiments done with caged oysters did not show significant bioaccumulation of Hg and PAHs in the Paranaguá site, but proved to be an excellent tool to assess bioavailability in the Santos estuary since they were able to bioaccumulate up to 1,600% of total PAH in the samples from the inner part of this estuary when compared to control organisms. Multivariate statistical analyses employed to these results have separated the sites evaluated and the most contaminated samples from the least contaminated.
Multilevel assessment of chlorothalonil sediment toxicity to Latin American estuarine biota: Effects on biomarkers, reproduction and survival in different benthic organisms
Science of The Total Environment, May 1, 2023
Waterborne Toxicity on Neotropical Invertebrates and Hazards of Cigarette Butt Leachates in Marine Environments
Arquivos de Ciências do Mar, Dec 1, 2015
Os estuários, encontro de rios e oceanos nas zonas litorâneas, apresentam biodiversidade atraente... more Os estuários, encontro de rios e oceanos nas zonas litorâneas, apresentam biodiversidade atraente à exploração e desenvolvimento de atividades humanas. No entanto, as ações antrópicas interferem nas dinâmicas estuarinas naturais, impactando-os tanto pela destruição da paisagem quanto pela adição de compostos que geram efeitos letais e subletais nos organismos. No Ceará, os estuários dos rios Ceará, Pacoti e Jaguaribe são relevantes visto suas localizações, importância socioeconômica e interações com populações ribeirinhas. Devido ao avanço da degradação da qualidade destes estuários, este trabalho apresenta uma revisão sobre a presença de contaminantes na água e no sedimento, e seus efeitos sobre a biota. O aumento da contaminação, principalmente pelo incremento nos níveis de metais no sedimento, tem sido evidenciado, especialmente nos últimos 10 anos. Danos biológicos foram vistos em espécies locais e testes de toxicidade evidenciaram o potencial tóxico, agudo e crônico, dos contaminantes presentes nos três estuários, incluindo o Pacoti, antigo sítio de referência. Apesar de iniciativas de proteção, os impactos nestes estuários são frequentes, contínuos e crescentes. Os dados ressaltam a existência de graves lacunas de conhecimento sobre as contaminações locais e reforçam a urgente necessidade de mais pesquisas e ações de controle para prevenir futuros impactos de amplitude ecossistêmica.
Predation on Artificial Nests in an Atlantic Rainforest Fragment from the Coast of São Paulo, Brazil
Journal of environment and human, Jul 31, 2014
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Abstracts from Fourteenth International Symposium on Pollutant Responses in Marine Organisms (PRIMO 14) – Genotoxicity
Marine Environmental Research, Jul 1, 2008
O Mundo da saúde, Dec 5, 2006
RESUMO: O Núcleo Pedro de Toledo faz parte do Parque Estadual da Serra do Mar, uma categoria de U... more RESUMO: O Núcleo Pedro de Toledo faz parte do Parque Estadual da Serra do Mar, uma categoria de Unidade de Conservação que não permite a presença de moradores e o uso direto de seus recursos naturais. No entanto, o Núcleo é ocupado por diversas famílias distribuídas em bairros relativamente bem definidos. Neste trabalho, foi realizado um perfil sócio-econômico dos moradores do núcleo, sendo investigada também a forma como usam e ocupam o solo e identificados os potenciais impactos ambientais decorrentes desse uso. Para tal, foram conduzidas visitas ao local, tendo sido aplicados questionários semi-estruturados aos moradores do interior e entorno do Núcleo. As comunidades são bastante homogêneas, sendo formadas basicamente por agricultores, muitos originados de fora do parque, não constituindo uma população tradicional. Embora tenham afirmado conhecer as restrições legais e conviver relativamente bem com elas, o uso e ocupação do solo foram considerados incompatíveis com a conservação dos recursos naturais destinando-se principalmente à produção agrícola, piscicultura e lazer. Com base nas informações levantadas, evidenciou-se a necessidade da incorporação de práticas agrícolas menos impactantes, além da introdução de alternativas econômicas que não envolvem o uso direto dos recursos do parque, como o ecoturismo, de modo a garantir a preservação do ambiente e a melhoria da qualidade de vida dos moradores, até que a situação fundiária do Núcleo seja resolvida.
Ecotoxicology and Environmental Contamination, Dec 1, 2019
Dredging involves the sediment excavation in order to increase the bathymetry of harbors by diffe... more Dredging involves the sediment excavation in order to increase the bathymetry of harbors by different methods. In urbanized and Industrial areas, dredging pose risks of negative effects on the biota due to sediment contamination. The Brazilian criteria for characterizing dredged material include chemical analyzes and comparison with sediment quality guidelines and toxicity testing, which require the development of novel and different biological models to be used in bioassays. In this study, we aimed to assess the quality of sediments collected during dredging activities of Mucuripe Bay (Fortaleza city, NE Brazil). Sediments were characterized for the concentration of metals and hydrocarbons, in order to establish the contamination status. Whole sediment toxicity was assessed by means of mortality of the amphipod Tiburonella viscana and the polychaete worm Armandia agilis, while chronic effects were evaluated on the fecundity of the copepod Tisbe biminiensis. Liquid phase exposures were determined in the acute toxicity of sediment-water interface (ISA) on the mysid Mysidopsis juniae, while chronic toxicity of ISA and elutriates (ELU) assessed by the embryo-larval development of the sea urchin Lytechinus variegatus. Results revealed that contaminated samples exhibited both acute and chronic toxicity. An integrative method for integrating different endpoints was employed and classified samples related to dredging activities as the most degraded. Extracts obtained from the material collected within the dredge were also tested for acute and chronic effects and exhibited toxicity as well. Based on our findings we recommend the analysis of material from dredger cistern and application of a set of bioassays in order to properly determine the quality of dredged sediments.
Journal of The Brazilian Society of Ecotoxicology, Dec 5, 2012
Micronucleus (MN) and nuclear abnormalities (NA) tests were used as biomarkers in the fish Oreoch... more Micronucleus (MN) and nuclear abnormalities (NA) tests were used as biomarkers in the fish Oreochromis niloticus from a polluted pond in winter, spring and summer. Samples of water column were taken aiming to evaluate physical-chemical parameters and acute toxicity to the microcrustacean Daphnia similis. The pond waters were toxic to D. similis in spring and winter, but this toxicity was not detected in summer. The pond waters presented low levels of dissolved oxygen in spring and summer; higher ammonia concentrations in winter, and high hardness and conductivity. Fish collected at the polluted pond exhibited higher rates of DNA damage, as indicated by increased rates of MN and NA in erythrocytes when compared to the negative control, which were associated to water toxicity and physical-chemical variable. Thus, this study shows that results of water toxicity tests and genotoxic biomarkers in fish may be associated and theses approaches may be used together for the water quality assessment.
Open journal of water pollution and treatment, Jun 30, 2014
The Ribeira de Iguape River (RIR) was historically contaminated by residues from mining activitie... more The Ribeira de Iguape River (RIR) was historically contaminated by residues from mining activities. These activities ceased in the late 1990's, but the residues remained deposited along the river banks. This study aimed to evaluate the sediment characteristics of the RIR in different hydro-meteorological conditions and detect eventual changes in the geochemistry. Three sampling surveys were conducted, in which sediments were collected in 6 sites, and then analyzed for sediment textures and metals concentrations. Sediments were predominantly sandy, and samples collected downstream to the mining areas tended to be enriched by metals, especially Pb, Cr, Cu, Ni and Zn. Concentrations of metals in sediments tended to be higher after rainstorm episodes, evidencing the pollution sources are not totally controlled and that the stormwater runoff may carry metals to the RIR.
Plastic Pellets Make Excirolana Armata More Aggressive: Intraspecific Interactions and Isopod Mortality Differences between Populations
Explaining the persistence of hazardous chemicals in the Doce River (Brazil) by multiple sources of contamination and a major environmental disaster
Journal of hazardous materials advances, Feb 1, 2023
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Papers by Denis Moledo Souza Abessa