Cytogenetic characterization of <i>Metynnis maculatus</i> (Teleostei; Characiformes): the description in Serrasalminae of a small B chromosome bearing inactive NOR-like sequences.

Baroni, Sabrina; Lopes, C. E. Ferreira; Almeida-Toledo, Lurdes Foresti de

doi:10.1080/00087114.2004.10589674

Cited by 12 publications

(1 citation statement)

References 18 publications

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“…Esse peixe é conhecido popularmente, em outras regiões, como "pacu-peva", comum no Rio Paraguai e na bacia do Rio Amazonas (Lacerda et al, 2003;Sabrina et al, 2009). Segundo os pescadores, essa espécie já está sendo muito capturada em suas redes e tem se transformado em um atraso na atividade pesqueira devido à grande quantidade de indivíduos capturados: "Esse peixe virou praga aqui na represa" (ppr, 25 anos).…”

Section: Espécies Introduzidasunclassified

Concepção dos pescadores artesanais que utilizam o reservatório de Furnas, Estado de Minas Gerais, acerca dos recursos pesqueiros: um estudo etnoictiológico

2010

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ResumoA etnoictiologia, baseando-se em parâmetros da ecologia, pode ser uma ferramenta bastante útil no estudo das mudanças ambientais provocadas por ações humanas, pois tais mudanças são percebidas pelos sujeitos que exercem atividades pesqueiras de subsistência e/ou recreativas nos ambientes impactados. O objetivo do presente trabalho foi investigar as percepções dos pescadores artesanais do município de Carmo do Rio Claro, Minas Gerais, acerca das alterações decorrentes de ações antropogênicas. Os dados foram obtidos de agosto de 2009 a janeiro de 2010 por meio de entrevistas abertas e semi-estruturadas, recorrendo-se às técnicas usuais de registro etnográfi co. Foram entrevistados 50 pescadores profi ssionais registrados, sendo 49 homens e apenas uma mulher. Os resultados revelam que esses pescadores têm observado a diminuição dos recursos pesqueiros, o desaparecimento e/ou escassez de algumas espécies e a introdução de espécies. Torna-se necessário procurar as melhores formas de recuperação e conservação das espécies nativas do reservatório de Furnas, além de um melhor monitoramento das espécies introduzidas. Unitermos: Carmo do Rio Claro, etnoictiologia, etnozoologia, impactos antrópicos, pescadores artesanais, recursos pesqueiros, reservatório de Furnas AbstractConception of the artisanal fi sherfolk who use Furnas Reservoir, Minas Gerais State, about fi shing stocks: an ethnoichthyological study. Ethnoichthyology, based on ecological parameters, can be a very useful tool to study man-made environmental changes. These changes are perceived by individuals who fi sh for a living and/or recreational activities in the impacted environs. The objective of this study was to investigate how the artisanal fi sherfolk of the municipality of Carmo do Rio Claro, Minas Gerais, perceive the environmental changes caused by anthropogenic actions. The data were collected from August 2009 to January 2010 by means of openended interviews according to usual ethnographical techniques. Fifty professional fi sherfolk were interviewed, forty-nine men and one woman. The results showed that they had experienced a reduction of fi shing resources, Biotemas, 23 (4): 135-145, dezembro de 2010

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Section: Espécies Introduzidasunclassified

Concepção dos pescadores artesanais que utilizam o reservatório de Furnas, Estado de Minas Gerais, acerca dos recursos pesqueiros: um estudo etnoictiológico

2010

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B chromosomes: from cytogenetics to systems biology

et al. 2016

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Though hundreds to thousands of reports have described the distribution of B chromosomes among diverse eukaryote groups, a comprehensive theory of their biological role has not yet clearly emerged. B chromosomes are classically understood as a sea of repetitive DNA sequences that are poor in genes and are maintained by a parasitic-drive mechanism during cell division. Recent developments in high-throughput DNA/RNA analyses have increased the resolution of B chromosome biology beyond those of classical and molecular cytogenetic methods; B chromosomes contain many transcriptionally active sequences, including genes, and can modulate the activity of autosomal genes. Furthermore, the most recent knowledge obtained from omics analyses, which is associated with a systemic view, has demonstrated that B chromosomes can influence cell biology in a complex way, possibly favoring their own maintenance and perpetuation.

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HP1 knockdown is associated with abnormal condensation of almost all chromatin types in a grasshopper (Eyprepocnemis plorans)

et al. 2014

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Heterochromatin protein 1 (HP1) is a highly conserved family of eukaryotic proteins required for heterochromatic gene silencing and euchromatic gene transcription regulation. In addition, HP1 is involved in chromatin organization and protection of chromosome integrity during cell division. Here, we present a cytological and molecular analysis of the effects of HP1 knockdown in Eyprepocnemis plorans, a grasshopper species polymorphic for supernumerary heterochromatic chromosomes. Our results revealed contrasting effects of HP1 knockdown on gene activity. While the Bub1 gene decreased in expression level in HP1 knockdown animals, NOR activity, rRNA and, contrarily to previous reports in Drosophila, Hsp70 gene expression remained unchanged. Furthermore, HP1 knockdown resulted in abnormal chromatin condensation, chromosomal bridges, higher frequency of macrospermatids, loss of muscle mass and hemolymph amount as well as a low number of dividing cells and survival reduction. All these phenotypes are very likely due to the chromatin condensation disruption observed for almost all kinds of chromatin.

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Cytogenetic characterization of Metynnis maculatus (Teleostei; Characiformes): the description in Serrasalminae of a small B chromosome bearing inactive NOR-like sequences.

Cited by 12 publications

References 18 publications

Concepção dos pescadores artesanais que utilizam o reservatório de Furnas, Estado de Minas Gerais, acerca dos recursos pesqueiros: um estudo etnoictiológico

Concepção dos pescadores artesanais que utilizam o reservatório de Furnas, Estado de Minas Gerais, acerca dos recursos pesqueiros: um estudo etnoictiológico

B chromosomes: from cytogenetics to systems biology

HP1 knockdown is associated with abnormal condensation of almost all chromatin types in a grasshopper (Eyprepocnemis plorans)

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