Environmental changes in Sepetiba Bay, SE Brazil

Molisani, Maurício Mussi; Marins, Rozane Valente; Machado, Wilson; Paraquetti, Heloisa H. M.; Bidone, Edison Dausacker; Lacerda, Luiz Drude de

doi:10.1007/s10113-003-0060-9

Cited by 132 publications

(57 citation statements)

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“…Do mesmo modo, o consumo de pescado da espécie Micropogonias furnieri foi estimado em 0,000000100%, ou seja, 1,00/10000000 indivíduos, para a espécie Cynoscion acoupa o risco estimado foi 0,000000887% ou 8,87/1000000 indivíduos. Molisani et al (2004) observaram elevados níveis de metais pesados nos manguezais da Baía de Sepetiba. A presença desses metais em peixes, crustáceos e moluscos bivalves está associada a riscos à saúde humana, pois esse contaminante pode se acumular em indivíduos que consomem organismos marinhos.…”

Section: Resultsunclassified

“…Compreende um corpo de águas salinas e salobras, que apresenta um volume aproximado de 3,5 x 109 m 3 , área de 520 km 2 e perímetro de 170 km. Possui forma alongada, limitando-se ao norte e ao leste pelo continente, ao Sul pela restinga de Marambaia e a oeste pela Baía de Ilha Grande (Molisani et al, 2004;. Sua população é estimada em torno de 1,7 milhões de habitantes, que em sua maior parte se concentra na porção pertencente ao município do Rio de Janeiro.…”

Section: Caracterização Do Sítio De Estudounclassified

“…Sua população é estimada em torno de 1,7 milhões de habitantes, que em sua maior parte se concentra na porção pertencente ao município do Rio de Janeiro. Das atividades econômicas da região pode-se destacar o turismo e a pesca artesanal, com a existência de colônias de pescadores, além do crescente desenvolvimento industrial, sendo um dos maiores polos industriais do Estado do Rio de Janeiro com mais de 400 indústrias, incluindo metalúrgicas e petroquímicas (Rio de Janeiro, 2001;Molisani et al, 2004;Ribeiro, 2006).…”

Section: Caracterização Do Sítio De Estudounclassified

“…Os riscos potenciais de contaminação gerados pelas atividades industriais têm maior relevância quando comparados aos riscos gerados pelos esgotos domésticos e pela agricultura (Molisani et al, 2004). Os metais constituem a principal classe de contaminantes emitida por esta atividade, sendo de grande preocupação a elevada quantidade desses elementos que são descarregados na Baía de Sepetiba, na atmosfera e nos rios locais, oferecendo riscos potenciais aos organismos e à população da região, que depende dos recursos pesqueiros como fonte de renda e de alimentação (Rio de Janeiro, 2001;Molisani et al, 2004).…”

Section: Introductionunclassified

“…Os metais constituem a principal classe de contaminantes emitida por esta atividade, sendo de grande preocupação a elevada quantidade desses elementos que são descarregados na Baía de Sepetiba, na atmosfera e nos rios locais, oferecendo riscos potenciais aos organismos e à população da região, que depende dos recursos pesqueiros como fonte de renda e de alimentação (Rio de Janeiro, 2001;Molisani et al, 2004).…”

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Modelling habitat use by the Guiana dolphin, Sotalia guianensis, in south‐eastern Brazil: Effects of environmental and anthropogenic variables, and the adequacy of current management measures

Tardin

Maciel

Espécie

et al. 2020

Aquatic Conservation

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1. Species distribution modelling has been used to identify critical habitats for the delimitation of Marine Protected Areas. Although Marine Protected Areas may often overlap with the distribution of key marine species, illegal human activities often continue within these areas, causing negative impacts on the local biodiversity. 2. A generalized linear model with spatial eigenvector mapping was used to investigate, for the first time, the influence of environmental variables and anthropic activities on the number of Guiana dolphin, Sotalia guianensis sightings/grid, and to determine whether a Marine Reserve, in south-eastern Brazil, is adequate for the protection of the local population. Data were collected between May 2007 and October 2013 onboard a 7.5-m vessel with an inboard engine.3. The models for the different periods (annual, dry, and rainy seasons) all indicated that depth, the distance to seafood farms and fishing grounds, and mean sea surface temperatures influenced the distribution of the dolphins within the study area. The annual and seasonal models predicted that the dolphins prefer a continuous area between Cedro and Pico Islands, a large area that lies outside the limits of the Marine Reserve. 4. Although the habitat of Ilha Grande bay is still much less degraded than that inhabited by other nearby Guiana dolphin populations, the results of the present study indicate that anthropic activities in this area influence habitat use by the dolphins. Less than 30% of the area used by the dolphins is protected by the Tamoios Ecological Station (ESEC Tamoios). 5. Sotalia guianensis is classified as 'Vulnerable' in Brazil, although the marine reserve (ESEC Tamoios) does not protect the core area used by the local dolphin population. The results of the present study provide specific locations for the creation of a new multiple-use MPA, as suggested by the Brazilian National Action Plan for the Conservation of Small Cetaceans, or the inclusion of a special management programme for the area between Cedro and Pico islands to better protect the dolphins in the ESEC Tamoios buffer zone. The continuation of surveys to better

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20 years of research on the Guiana dolphin population of Sepetiba Bay, southeastern Brazil: What has changed?

Maciel,

Maricato,

Marqui

et al. 2023

Aquatic Conservation

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Despite the importance of coastal habitats for the provision of many ecosystem services, these areas are currently among the most impacted by human activities. Impacts on coastal ecosystems may affect many key species, such as the Guiana dolphin, which inhabits Sepetiba Bay in south‐eastern Brazil, a highly degraded environment owing to a human‐induced rapid environmental change. In this context, this study investigates the potential changes in the local Guiana dolphin behaviour, group structure, bioacoustics, site fidelity and habitat use over the past 20 years. For this, a historical database (1998–2007) was compared with current data on the local dolphin population (2017–2019). Between 2017 and 2019, the Guiana dolphins form significantly smaller groups (W = 3262.5, P > 0.001), spend more time foraging (61 vs. 10% in the past), emit whistles at a considerably lower rate (decreasing by 85.2%), have reduced site fidelity and now use a larger area. As Sepetiba Bay has been severely impacted by human activities in the recent past, with profound consequences for much of its biodiversity, the observed changes in dolphin behaviour are probably a consequence of habitat degradation and, in particular, of reduced prey availability. These findings have important implications for the management and conservation of the Guiana dolphin population of Sepetiba Bay. To break this human‐induced rapid environmental change, it will be essential to minimize the spatio‐temporal overlap of anthropogenic impacts, to avoid cumulative impacts. To mitigate anthropogenic impacts on the Guiana dolphins of Sepetiba Bay, it will be important to direct the following actions: (i) the regulation and control of anthropogenic noise; (ii) reduction and control of the release of chemical contaminants and organic effluents; (iii) more effective controls on vessel traffic within the areas used preferentially by the Guiana dolphin; and (iv) the implementation of measures to avoid overfishing and bycatch.

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Environmental changes in Sepetiba Bay, SE Brazil

Cited by 132 publications

References 18 publications

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Modelling habitat use by the Guiana dolphin, Sotalia guianensis, in south‐eastern Brazil: Effects of environmental and anthropogenic variables, and the adequacy of current management measures

20 years of research on the Guiana dolphin population of Sepetiba Bay, southeastern Brazil: What has changed?

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