Insights on the evolution of the living Great Amazon Reef System, equatorial West Atlantic

Mahiques, Michel Michaelovitch de; Siegle, Eduardo; Francini‐Filho, Ronaldo B.; Thompson, Fabiano L.; Rezende, Carlos Eduardo de; Gomes, José Diego; Nils, E.

doi:10.1038/s41598-019-50245-6

Cited by 32 publications

(12 citation statements)

References 34 publications

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“…The criticism on the existence of a living reef in the Amazon River mouth was raised (see Mahiques et al, 2019), but the recent studies demonstrate that the reef is alive and growing, with living organisms inhabiting the GARS in its totality (Mahiques et al, 2019;Lavagnino, et al, 2020) but, possibly with very small growth index (Lavagnino, et al, 2020). Additionally, more recently Omachi et al, (2019) have demonstrated that there is enough light for photosynthetic organisms to thrive in the area of the GARS.…”

Section: Study Areamentioning

confidence: 99%

New Insight Into the Reproductive Biology and Catch of Juveniles of the Lutjanus purpureus in a Portion of the Great Amazon Reef System Off the Northern Brazilian Coast

et al. 2022

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The Southern red snapper, Lutjanus purpureus, is a valuable economic resource, especially in international market. However, no recent data are available on the reproductive biology of this species in Brazilian waters, in particular, the stock found on the Amazon reef. The present study evaluated the population structure and reproductive biology of L. purpureus, and the volume of the catch of juveniles taken by the local commercial fisheries. A total of 923 specimens were analyzed, of which, 577 were female and 346 male (sex ratio: 0.6:1; p < 0.05). The analysis of the gonadosomatic index (GSI) and the distribution of maturation stages indicated that the males and females are able to reproduce throughout the year, however the reproductive peak occurs simultaneously with the increase in the water discharge of the Amazon River. The spawning females were registered in the study area, indicating that L. purpureus does not perform long distance reproductive migrations, different from the previously proposed. The Fork length at first sexual maturation (FL50) was estimated to be 35.2 cm in the males and 32.1 cm in the females. The high frequency of juveniles (< FL50) captured by the commercial snapper fleet using longlines (33.67% of the total catch) and traps (42.1%) indicates the poor selectivity of the fishing gear used by the snapper fleet, which may contribute to the accelerated depletion of the L. purpureus stock. Although the results of this study show a catch percentage of juveniles >50%, it is still a significant percentage of juveniles that are being caught due to little or no guidance and enforcement of fishing gear to ensure compliance with current legislation. Considering the data presented in this study and the current situation of declining fish stocks of L. purpureus, an assessment is recommended for the inclusion of the species in the IUCN Red List of Threatened Species, which is currently a species categorized as “vulnerable” in the Brazilian Red List.

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Section: Study Areamentioning

confidence: 99%

New Insight Into the Reproductive Biology and Catch of Juveniles of the Lutjanus purpureus in a Portion of the Great Amazon Reef System Off the Northern Brazilian Coast

et al. 2022

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“…Brazilian coral reefs comprise the largest area of reefs in the Southwestern Atlantic Ocean, spreading over more than 3,000 km alongshore (Leão et al, 2016). In addition, an extensive Mesophotic Coral Ecosystem (~9500 km 2 ) has been mapped between Brazil and the Caribbean (Great Amazon Reef System; Mahiques et al, 2019). Coral reefs are considered one of the most vulnerable ecosystems to OA impacts.…”

Section: Coral Reefsmentioning

confidence: 99%

Coastal Ocean Acidification in Brazil: A Brief Overview and Perspectives

Cotovicz

Marins

Abril

2022

ACMAR

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This perspective paper aims at presenting the current knowledge on the processes of ocean acidification (OA) and coastal acidification (CA) in the Brazilian coastal ocean. We define and differentiate the processes of OA and CA: the first driven by the actual global increase of atmospheric carbon dioxide (CO2); the second driven by a combination of ocean uptake of atmospheric CO2 and other local/regional chemical additions or subtractions in aquatic ecosystems at the land-ocean interface. Regarding OA, we have centered our analysis on the data available for the main water masses along the Brazilian coast: South Atlantic Central Water (SACW), Tropical Water (TW), and Coastal Water (CW). The few data available for the shallow coastal waters (< 200 m depth) of the continental shelf reveal an increase in the anthropogenic component of the total dissolved inorganic carbon (DIC) pool in the SACW, with a decline in the ocean pH (over two decades; 1993-2013), and in the saturation state of calcium carbonate (CaCO3) minerals. We could not find OA trends for TW and CW because no data was available. Overall, the colder water masses (SACW, Plata Plume) have lower buffering capacity and simulations show that will potentially experience earlier negative OA impacts than the warmer waters masses (TW, Amazon Plume). Regarding CA, we have identified some local/regional studies investigating the carbonate chemistry in nearshore/estuarine ecosystems, particularly on the quantification of sources and sinks of CO2 , and determining short-term variabilities. Apparently, spreading coastal eutrophication in Brazil can enhances or reduces the process of OA, depending on the net ecosystem metabolism in combination with other chemical alterations. However, we could not find medium-long term acidification trends due to the limited data. There is a limited capacity to produce long time-series of carbonate chemistry parameters in key ecosystems and regions along the Brazilian coast. This lack of past information hinders and impairs the scientific community for identifying potential patterns of acidification along the Brazilian coast. We call for an urgent action in Brazil, with emphasis on the establishment of moored buoys/stations and/or scientific programs in the long term with continuous, real-time measurements of the main carbonate chemistry parameters. Keywords: ocean acidification, coastal acidification, coastal eutrophication, continental shelf, Southwestern Atlantic Ocean

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“…Quando questionados sobre sua disposição a ajudar a conservar os recifes da -FILHO et al, 2018;NEUMANN-LEITÃO et al, 2018;THOMPSON et al, 2018;MAHIQUES et al, 2019;SALES et al, 2019;SANTANA et al, 2020).…”

Section: Perfil Dos Entrevistadosunclassified

Avaliação Da Genotoxicidade Através De Alterações Morfonucleares Em Eritrócitos Da Ictiofauna Do Médio Rio São Francisco Em Minas Gerais (Brasil)

Braga¹,

Damasceno²,

Damasceno³

2021

Geociências: Estabelecimento E Evolução Da Civilização Humana 3

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Direitos para esta edição cedidos à Atena Editora pelos autores. Todo o conteúdo deste livro está licenciado sob uma Licença de Atribuição Creative Commons. Atribuição-Não-Comercial-NãoDerivativos 4.0 Internacional (CC BY-NC-ND 4.0). O conteúdo dos artigos e seus dados em sua forma, correção e confiabilidade são de responsabilidade exclusiva dos autores, inclusive não representam necessariamente a posição oficial da Atena Editora. Permitido o download da obra e o compartilhamento desde que sejam atribuídos créditos aos autores, mas sem a possibilidade de alterá-la de nenhuma forma ou utilizá-la para fins comerciais. Todos os manuscritos foram previamente submetidos à avaliação cega pelos pares, membros do Conselho Editorial desta Editora, tendo sido aprovados para a publicação com base em critérios de neutralidade e imparcialidade acadêmica. A Atena Editora é comprometida em garantir a integridade editorial em todas as etapas do processo de publicação, evitando plágio, dados ou resultados fraudulentos e impedindo que interesses financeiros comprometam os padrões éticos da publicação. Situações suspeitas de má conduta científica serão investigadas sob o mais alto padrão de rigor acadêmico e ético.

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Insights on the evolution of the living Great Amazon Reef System, equatorial West Atlantic

Cited by 32 publications

References 34 publications

New Insight Into the Reproductive Biology and Catch of Juveniles of the Lutjanus purpureus in a Portion of the Great Amazon Reef System Off the Northern Brazilian Coast

New Insight Into the Reproductive Biology and Catch of Juveniles of the Lutjanus purpureus in a Portion of the Great Amazon Reef System Off the Northern Brazilian Coast

Coastal Ocean Acidification in Brazil: A Brief Overview and Perspectives

Avaliação Da Genotoxicidade Através De Alterações Morfonucleares Em Eritrócitos Da Ictiofauna Do Médio Rio São Francisco Em Minas Gerais (Brasil)

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