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	Provedor de dados Neotropical Ichthyology (3) Genet. Mol. Biol. (1) Autor Calcagnotto,Daniela (4) Quagio-Grassiotto,Irani (2) Santana,Júlio César de O. (2) DeSalle,Rob (1) Netto-Ferreira,André L. (1) Toledo-Filho,Silvio de Almeida (1) Mais... Palavra-chave Ostariophysi (2) Spermatozoa (2) Systematics (2) Ultrastructure (2) African Fish (1) Migratory fish (1) Neotropical Fish (1) Neotropical fish (1) Pantanal of Mato Grosso (1) Population genetics (1) Serrasalmidae (1) Mais... Tipo do documento Info:eu-repo/semantics/article (4) Ano 2014 (1) 2013 (1) 2009 (1) 2000 (1) País Brazil (4) Idioma Inglês (4)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 4 Primeira ... 1 ... Última Loss of genetic variability at the transferrin locus in five hatchery stocks of tambaqui (Colossoma macropomum) Genet. Mol. Biol. Calcagnotto,Daniela; Toledo-Filho,Silvio de Almeida. Knowledge and conservation of the genetic variability in stocks maintained as live gene banks have become a high priority task for Brazilian fish culture. The aim of the present survey was to assess the transferrin allelic diversity of five hatchery stocks of tambaqui (Colossoma macropomum). The tambaqui stock from Pentecoste, the oldest maintained in Brazilian hatchery stations, retained three of the six alleles detected in wild populations of tambaqui from the Amazon River. Other hatchery stocks, directly or indirectly derived from the Pentecoste stock, did not show transferrin allelic variability. Insufficient number of founders and genetic drift due to sampling errors seem to be the main causes leading to loss of genetic diversity in tambaqui hatchery... Tipo: Info:eu-repo/semantics/article Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572000000100023 Sperm characteristics as additional evidence of close relationship between Lebiasina and Piabucina (Characiformes: Lebiasinidae: Lebiasininae) Neotropical Ichthyology Santana,Júlio César de O.; Netto-Ferreira,André L.; Calcagnotto,Daniela; Quagio-Grassiotto,Irani. Spermiogenesis and spermatozoa of representatives of the genera Lebiasina and Piabucinaare described. Spermiogenesis is quite similar among all analyzed species of these genera and is identified as Type II. In this type of spermiogenesis, the flagellum of earliest spermatids lies lateral to the nucleus. A slight movement of the nucleus towards the centriolar complex is observed. In late spermatids, the nucleus slightly elongates towards the flagellum. The formation of two striated rootlets apparently occurs in early/intermediate spermatids. The spermatozoa of species of Lebiasinaand Piabucina share (1) a drop-shaped slightly elongated nucleus that is laterally positioned relative to the flagellum; (2) a superolateral centriolar complex; (3) two striated... Tipo: Info:eu-repo/semantics/article Palavras-chave: Ostariophysi; Neotropical Fish; Spermatozoa; Systematics; Ultrastructure. Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252013000300573 Sperm evolution in the family Alestidae with comparative data for the genus Chalceus (Ostariophysi: Characiformes) Neotropical Ichthyology Santana,Júlio César de O.; Calcagnotto,Daniela; Quagio-Grassiotto,Irani. Spermiogenesis and spermatozoa in six genera of the African family Alestidae plus the Neotropical genus Chalceusare described. Spermiogenesis is quite similar in all Alestidae and is identified as Type I and its variants. In Type I spermiogenesis, the flagellum of earliest spermatids lies lateral to the nucleus, and rotation of the nucleus towards the centriolar complex is observed. Nuclear rotation is complete reaching 90 degrees in Bryconalestes longipinnis, Brachypetersius altus, Brycinus imberi, B. lateralis, and Alestopetersius compressus; and is incomplete reaching 20 degrees in Micralestes acutidensand Rhabdalestesrhodesiensis. Spermatozoa morphology varies from a medial nucleus with fibrillar chromatin in the most basal genus Brycinusto a strongly... Tipo: Info:eu-repo/semantics/article Palavras-chave: African Fish; Ostariophysi; Spermatozoa; Systematics; Ultrastructure. Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252014000200419 Population genetic structuring in pacu (Piaractus mesopotamicus) across the Paraná-Paraguay basin: evidence from microsatellites Neotropical Ichthyology Calcagnotto,Daniela; DeSalle,Rob. The Paraná-Paraguay basin encompasses central western Brazil, northeastern Paraguay, eastern Bolivia and northern Argentina. The Pantanal is a flooded plain with marked dry and rainy seasons that, due to its soil characteristics and low declivity, has a great water holding capacity supporting abundant fish fauna. Piaractus mesopotamicus, or pacu, endemic of the Paraná-Paraguay basin, is a migratory species economically important in fisheries and ecologically as a potential seed disperser. In this paper we employ eight microsatellite loci to assess the population structure of 120 pacu sampled inside and outside the Pantanal of Mato Grosso. Our main objective was to test the null hypothesis of panmixia and to verify if there was a different structuring... Tipo: Info:eu-repo/semantics/article Palavras-chave: Neotropical fish; Pantanal of Mato Grosso; Population genetics; Migratory fish; Serrasalmidae. Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000400008 Registros recuperados: 4 Primeira ... 1 ... Última

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