Evidências de Mudanças Climáticas na Região de Transição Amazônia-Cerrado no Estado do Maranhão

Silva, Fabrício Brito; Santos, Jessflan Rafael Nascimento; Feitosa, F. E. C. S.; Silva, Itallo Dirceu Costa; Araújo, Mayara Lucyanne Santos de; Guterres, Camila Everton; Santos, Juliana Sales dos; Ribeiro, Camila Viegas; Bezerra, Denilson da Silva; Neres, Raimundo Luna

doi:10.1590/0102-778631320150149

Cited by 26 publications

(19 citation statements)

References 13 publications

(9 reference statements)

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“…This study was conducted out in Lake Açu (Figure 1 In relation to the climate, the state of Maranhão has high rates of rainfall when compared to other Brazilian states, around 1,700 mm/ year (Costa-Neto et al, 2001/2002Ibañez et al, 2000;Silva et al, 2016). The organization of rainfall is clearly classified as a tropical climate, characterized by the division of two major climatic periods: the rainy season, which covers the months of January to June, and the dry period extending from July to December (Barbieri, Salles, Cestarolli, & Teixeira-Filho, 2004;Costa-Neto et al, 2001/2002.…”

Section: Materials S and Me Thodsmentioning

confidence: 99%

“…GS1 (immature), GS2 (maturing or resting), GS3 (mature), and GS4 (spawned) increasing from November (month characterized by scarce rains); and reach of maximum values in January, month of rainfall peaks(Costa- Neto et al, 2001/2002Silva et al, 2016). GS1 (immature), GS2 (maturing or resting), GS3 (mature), and GS4 (spawned) F I G U R E 7 Relative frequency (%) of gonadal maturity stages in males of Prochilodus lacustris.…”

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confidence: 99%

“…GS1 (immature), GS2 (maturing or resting), GS3 (mature), and GS4 (spawned) F I G U R E 7 Relative frequency (%) of gonadal maturity stages in males of Prochilodus lacustris. GS1 (immature), GS2 (maturing or resting), GS3 (mature), and GS4 (spawned)increasing from November (month characterized by scarce rains); and reach of maximum values in January, month of rainfall peaks(Costa- Neto et al, 2001/2002Silva et al, 2016). This reproductive interval (between November and January) coincides with the results reported for other species of the genus Prochilodus, such as Prochilodus argenteus in the Três Marias Dam (MG)(Arantes, Santos, Rizzo, Sato, & Bazzoli, 2010), and Prochilodus affinis in the basin of the São…”

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Aspects of reproductive biology of curimba Prochilodus lacustris (Pisces, Prochilodontidae) in a tropical lake in Northeastern Brazil

et al. 2019

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This study evaluated the annual cycle of biological reproductive aspects of Prochilodus lacustris, a neotropical fish species, in Baixada Maranhense Protection Area in northeastern Brazil. Fish were collected monthly between June of 2015 and June of 2016 using gill nets. In the laboratory, 600 individuals were weighed, measured, and eviscerated to obtain biometric data and data for the microscopic and macroscopic analyses of the maturation stages of the gonads. These analyses allowed the determination of the reproductive period using biological indicators such as the gonadosomatic index and hepatosomatic index, condition factor, stomach repletion index, and spawning season. Abiotic variables were measured in situ during the samplig: temperature, pH, dissolved oxygen, and electrical conductivity. In addition, local rainfall data was also obtained. The results showed that the total body length of individuals varied from 151 to 211 mm in males, and from 142 to 239 mm in females. The sex ratio showed a predominance of females over males, and the species showed negative allometric growth. The annual variation of reproductive indicators and the frequency of individuals in advanced stages of gonadal maturation suggest that the reproductive cycle of the species occurs between November and January, with a reproductive peak in January. This reproductive peak coincides with the beginning of the region's rainy season. Although we did not do the fertility analysis, our results suggest that the species presents partitioned spawning. In conclusion, this results demonstrates that the reproduction of the investigated specie is influenced by associations between environmental variables on a seasonal scale and can be contribute to improve the understanding of the dynamics of the physiological reproductive process in lentic environments.

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confidence: 99%

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confidence: 99%

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Aspects of reproductive biology of curimba Prochilodus lacustris (Pisces, Prochilodontidae) in a tropical lake in Northeastern Brazil

et al. 2019

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“…De maneira geral, as estações presentes no bioma Amazônico indicaram a ocorrência da estação seca entre julho a novembro e a estação chuvosa entre dezembro a junho. No bioma Cerrado, de maneira geral, a estação seca ocorreu entre maio a novembro e a estação chuvosa entre dezembro a abril (SILVA et al, 2016).…”

Section: Resultsunclassified

Caracterização Espaço-Temporal Dos Componentes Do Balanço De Radiação E Calor Na Região De Transição Amazônia-Cerrado

Araújo

Santos²,

Feitosa³

et al. 2019

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Os processos radiativos na superfície são de crucial importância para redistribuição de umidade e de calor no solo e na atmosfera, pois as trocas de calor e umidade afetam o comportamento da biosfera, do tempo e do clima na Terra. Os estudos de modelagem climática utilizam como parâmetros os componentes do balanço de radiação e calor na superfície, com as trocas de energia na interface vegetação-atmosfera. O objetivo do presente trabalho foi caracterizar espaço-temporalmente os componentes do balanço de radiação e calor no Maranhão, por meio de dados provenientes da base Global Land Data Assimilation System – GLDAS, no período de 2000 a 2014. Foram realizadas técnicas de estatística descritiva, como a medida de tendência central e de variabilidade de dados para caracterização dos mesmos. As médias mensais da radiação de ondas curtas incidente e do saldo de radiação de ondas curtas, no bioma Amazônico, não evidenciaram um comportamento diferenciado entre os períodos seco e chuvoso. Por sua vez, a radiação de ondas curtas incidente e o saldo de radiação de ondas curtas, no bioma Cerrado, apresentaram médias mensais superiores no período seco. O fluxo de calor sensível e o fluxo de calor no solo, nos biomas Cerrado e Amazônia, também apresentaram médias mensais superiores no período seco. A radiação de ondas longas incidente, o saldo de radiação de ondas longas e o fluxo de calor latente, nos biomas Cerrado e Amazônia, apresentaram médias mensais superiores no período chuvoso. De maneira geral, a base de dados GLDAS viabiliza os estudos de planejamento ambiental em regiões de escassez de dados climáticos, como o estado do Maranhão.

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“…Consequently, the whole basin area deserves attention concerning preservation, which will determine the availability of water at the spring in quantity and stability over the year, including during the dry season (CALHEIROS et al, 2009). In general, in Maranhão, it is possible to observe that precipitation has decreased over the past years, which may cause future problems to these water springs (SILVA et al, 2014;2016). …”

Section: Discussionmentioning

confidence: 99%

Methodology for Rapid Assessment of Environmental Quality of Water Springs

Silva¹,

Bezerra²,

Bezerra³

et al. 2017

Rev. InterEspaço

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This study has the objective of proposing a methodology for the rapid evaluation of the environmental quality of water springs, in the context of hydrographic basins. For this, 11 water springs of the Bacanga River were assessed. To calculate the Environmental Quality Index, it was adopted the Fuzzy operator, Weighted Mean AHP, which uses the methodology of the Analytical Hierarchy Process (AHP) to address the environmental factors involved in the index. Of the 11 analyzed springs, five were classified in class Very Good, three in class Good, two in class Reasonable and one water spring was classified as class Bad. No spring was framed in Class Very Bad. Therefore, we concluded that the use of fuzzy logic with AHP aid has proven to be effective in the environmental quality classification of springs, as it allows monitoring and subsides for the |Methodology for rapid assessment of environmental quality of water springs| RESUMENEste estudio tiene por objeto proponer una metodología simplificada para la evaluación rápida de la calidad ambiental de los muelles, en el contexto de las cuencas hidrográficas. Para ello, se evaluaron 11 cabeceras del Río Bacanga. Para calcular el Índice de Calidad Ambiental, aprobada el operador Fuzzy Promedio Ponderado AHP, que utiliza la metodología del Proceso Analítico Jerárquico (AHP) para hacer frente a los factores ambientales implicados en el índice. De los 11 manantiales analizados, cinco fueron clasificados como clase Muy bueno, tres como Bueno, dos en la clase Media y un resorte se clasificó en la clase Mala. Ninguna fuente se ha enmarcado en la clase Muy Malo. Por lo tanto, llegamos a la conclusión de que el uso de la lógica difusa con la ayuda de AHP fue eficaz en la clasificación de la calidad del medio ambiente de resortes, que permite el seguimiento y la provisión para la gestión de componente hidrológico. Se sugiere que, para los resortes enmarcados en las clases justos y pobres, las intervenciones se hacen para la recuperación ambiental de estos. La urbanización no planificada se ha identificado como el agente principal de la degradación de las aguas estudiadas.

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Evidências de Mudanças Climáticas na Região de Transição Amazônia-Cerrado no Estado do Maranhão

Cited by 26 publications

References 13 publications

Aspects of reproductive biology of curimba Prochilodus lacustris (Pisces, Prochilodontidae) in a tropical lake in Northeastern Brazil

Aspects of reproductive biology of curimba Prochilodus lacustris (Pisces, Prochilodontidae) in a tropical lake in Northeastern Brazil

Caracterização Espaço-Temporal Dos Componentes Do Balanço De Radiação E Calor Na Região De Transição Amazônia-Cerrado

Methodology for Rapid Assessment of Environmental Quality of Water Springs

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