Resposta morfológica de uma espécie de peixe tropical aos represamentos do Rio Paraíba do Sul, RJ

Santos, Alex Braz Iacone

Please use this identifier to cite or link to this item: https://rima.ufrrj.br/jspui/handle/20.500.14407/11309

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DC Field	Value	Language
dc.contributor.author	Santos, Alex Braz Iacone
dc.date.accessioned	2023-12-22T01:49:59Z	-
dc.date.available	2023-12-22T01:49:59Z	-
dc.date.issued	2012-05-29
dc.identifier.citation	SANTOS, Alex Braz Iacone. Resposta morfológica de uma espécie de peixe tropical aos represamentos do Rio Paraíba do Sul, RJ. 2012. 29 f. Dissertação (Mestrado em Ciências Ambientais e Florestais) - Instituto de Florestas, Universidade Federal Rural do Rio de Janeiro, Seropédica, 2012.	por
dc.identifier.uri	https://rima.ufrrj.br/jspui/handle/20.500.14407/11309	-
dc.description.abstract	Os impactos de barragens artificiais na estrutura da comunidade de peixes são bem reconhecidos, no entanto os efeitos de represamentos nas espécies tropicais persistentes em reservatórios são praticamente inexplorados. Este estudo investigou se represamentos afetam a morfologia corpórea de Astyanax bimaculatus, um pequeno caracídeo amplamente distribuído na América do Sul. Foram analisados indivíduos de dois tipos de habitats (reservatório e rio) em três barramentos ao longo do Rio Paraíba do Sul. Estes represamentos variam em relação ao grau de conexão entre os habitats: a) sem conexão; b) com escada de peixes de funcionamento temporário; c) e com conexão permanente. A hipótese testada é de que represamentos promovem diferenças entre habitats podendo resultar em divergência morfológica nos peixes que os habitam. A morfometria geométrica foi a técnica utilizada para obter as variáveis de forma e análises multivariadas empregadas para analisar as diferenças de forma. A Análise de Função Discriminante classificou 70,3% (distância de Mahalanobis = 1,06; P = 0,0009) dos indivíduos dentro do habitat correto, confirmando a divergência intraespecífica. Segundo a Análise Multivariada de Covariância, o habitat e o local (i.e. comparação entre os pares de reservatório–rio) explicaram 23,2% e 35,7% da variância da forma, respectivamente. Além disto, não foi encontrada interação significativa entre estes dois fatores. Os indivíduos capturados em habitat de rio apresentaram corpo mais hidrodinâmico (i.e. fusiforme), base das nadadeiras dorsal e anal encurtadas, boca relativamente voltada para cima e nadadeira peitoral situada mais anteroventralmente em comparação aos de reservatório. A menor diferença morfológica entre habitats foi constatada no barramento com conexão permanente entre reservatório e rio. Concluí-se que o represamento de ambientes lóticos é um fator atuante na diversificação de formas. Os padrões morfológicos observados são consistentes com os princípios da morfologia funcional, sugerindo a divergência adaptativa. Portanto, os impactos ambientais causados por barragens também devem ser avaliados dentro do contexto da divergência morfológica, objetivando a adoção de medidas apropriadas para o propósito de manejo e conservação.	por
dc.description.sponsorship	Conselho Nacional de Desenvolvimento Científico e Tecnológico - CNPq	por
dc.format	application/pdf	*
dc.language	por	por
dc.publisher	Universidade Federal Rural do Rio de Janeiro	por
dc.rights	Acesso Aberto	por
dc.subject	divergência morfológica	por
dc.subject	fragmentação	por
dc.subject	reservatórios	por
dc.subject	morphological divergence	eng
dc.subject	fragmentation	eng
dc.subject	reservoirs	eng
dc.title	Resposta morfológica de uma espécie de peixe tropical aos represamentos do Rio Paraíba do Sul, RJ	por
dc.title.alternative	Morphological responses of a tropical fish species to the impoundments of Paraíba do Sul River, RJ	eng
dc.type	Dissertação	por
dc.description.abstractOther	It is widely known that dams alter the fish assemblage structure, but effects of river damming on tropical native species persisting in reservoirs are largely unexplored. In this study were examined whether impoundments affect the body shape of Astyanax bimaculatus, a widely distributed characin fish in the South America. Individuals from three pairs of reservoir and river habitats across the Paraíba do Sul River were analyzed. These impoundments vary in relation to the degree of connection between habitats: 1) without connection; 2) with temporary fishway; 3) and with permanent connection. The raised hypothesis is that differences between habitats would result in morphological divergence in fishes that inhabit them. Geometric morphometric methods were used to obtain shape variables and multivariate analyses were performed to analyze body shape differences. The Discriminant Function Analysis classified 70.3% (Mahalanobis distance = 1.06; p = 0.0009) of individuals into the correct habitat, confirming the intraspecific divergence. According to the Multivariate Analysis of Covariance, habitat and location (i.e. comparison among reservoir–river pairs) explained 23.2% and 35.7% of partial variance in shape, respectively. Furthermore, interaction was not observed. Individuals inhabiting rivers were streamlined (i.e. fusiform), have a shorter dorsal and anal fin base, a relative upturned mouth and a more anteroventrally pectoral fin than individuals in reservoirs. The lowest difference was found in the dam with permanent connection between habitats. Therefore, the connectivity is an important factor driving shape diversification. The observed morphological patterns are consistent with functional morphological principles suggesting adaptive divergence. Thus the environmental impacts of dams should also be evaluated within the morphological divergence context in order to take the appropriated measures for management and conservation purposes.	eng
dc.contributor.advisor1	Araújo, Francisco Gerson
dc.contributor.advisor1ID	040.983.233-20	por
dc.contributor.advisor1Lattes	http://lattes.cnpq.br/7898069293489622	por
dc.contributor.referee1	Nunes, Jorge Luiz Silva
dc.contributor.referee2	Nogueira, Marcelo Rodrigues
dc.creator.ID	127.046.847-23	por
dc.creator.Lattes	http://lattes.cnpq.br/8063763523627769	por
dc.publisher.country	Brasil	por
dc.publisher.department	Instituto de Florestas	por
dc.publisher.initials	UFRRJ	por
dc.publisher.program	Programa de Pós-Graduação em Ciências Ambientais e Florestais	por
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dc.subject.cnpq	Recursos Florestais e Engenharia Florestal	por
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dc.originais.uri	https://tede.ufrrj.br/jspui/handle/jspui/3798
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