Animal Populations
Mostrando 37-48 de 382 artigos, teses e dissertações.
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37. Mamíferos de médio e grande porte em paisagem silvicultural da região do Alto Paranapanema, Estado de São Paulo, Brasil / Middle-to large sized mammals in silviculture landscapes at the Alto Paranapanema region, São Paulo State, Brazil
A alteração dos ecossistemas naturais e a criação de novos ambientes podem alterar significativamente o padrão de distribuição das espécies silvestres e a disponibilidade dos recursos naturais. A expansão agrícola pode ser considerada como uma das principais perturbações antrópicas responsáveis pela conversão das florestas nativas. Mamíferos
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/08/2011
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38. Marcadores microssatélites: ferramentas para manejo e conservação da variabilidade genética em populações de tambaqui (Colossoma macropomum, Cuvier 1818)
Fishing and aquaculture are directly or indirectly important to the life of million people around the world. However, many species are being overexploited and reduced in number, without management and conservation plans to minimize the impacts caused by human activity. The management of fisheries genetic resources, from nature or captivity, depends on strict
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/07/2011
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39. Diversidade cromossômica e molecular no gênero Astyanax (Characiformes: Characidae) / Chromosomal and molecular diversity in the genus Astyanax (Characiformes: Characidae)
The origin of the genus Astyanax, one of the most specious genera of the family Characidae is appointed as polyphyletic, with its current taxonomic status Incertae sedis.Morphologic, genetic and phylogeographic studies contribute to a better knowledge on the genus, which is considered a model. In this work, several species of different locations were studied
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/05/2011
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40. Variabilidade genética Atta robusta Borgmeier (Hymenoptera: Formicidae) com o uso de marcadores microssatélites / Genetic variability on Atta robusta Borgmeier (Hymenoptera: Formicidae) using microsatellite primers
This is the first genetic study on Atta robusta to investigate the genetic variability and structure in populations from Espírito Santo and Rio de Janeiro in which microsatellites specific primers were used. Twenty microsatellite primers for A. robusta were designed and eleven (55%) were polymorphic. When analyzing 80 colonies of A. robusta, the number of a
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 22/02/2011
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41. Biotécnicas da reprodução animal aplicadas à conservação de cervídeos.
The present work aimed to present a literature research about two deer species - Blastocerus dichotomus (llliger, 1815) - Cervo-do-pantanal and Ozotocerus bezoarticus (Linnaeus, 1758) - Veado-campeiro, due to their importance in Central Brazil. The main aspects studied were: species biology, density and populational distribution; factors related to their dec
Planaltina. Publicado em: 2011
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42. Genetic diversity and population structure of Brazilian native bovine breeds.
Conservation and improvement strategies should be based on the association between genetic and phenotypic characteristics. The objective of this work was to characterize five native Brazilian cattle breeds (Caracu, Crioulo Lageano, Curraleiro, National Polled and Pantaneiro) and two commercial breeds (Holstein and Nellore) using RAPD technique to estimate ge
Pesquisa Agropecuária Brasileira. Publicado em: 2011
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43. La consolidación del programa adaptacionista
What we call today the adaptationist program did not play a prominent role in the Evolutionary Biology developed in the xixth century, and during the first four decades of the xxth century. Until 1940, only studies on animal colorations, fundamentally of insects, were oriented by an adaptationist agenda. During the period 1940-1970, with the developments of
Scientiae Studia. Publicado em: 2011
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44. Genetic diversity of Brazilian Pantaneiro horse and relationships among horse breeds.
The objective of this work was to evaluate the genetic diversity of Brazilian Pantaneiro horse by microsatellite markers, investigate the effect of genetic bottlenecks and estimate genetic differentiation among four horse breeds. Genetic variation was estimated through allele frequencies and mean breed heterozygosity. Nei´s genetic distances among the breed
Pesquisa Agropecuária Brasileira. Publicado em: 2011
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45. Polyethylene glycol and polyvinylpirrolidone effect on bacterial rRNA extraction and hybridization from cells exposed to tannins.
In order to detect fluctuations in ruminal microbial populations due to forage tannins using 16S ribosomal RNA (rRNA) probes, recovery of intact rRNA is required. The objective of this work was to evaluate the effect of polyethylene glycol (PEG) and polyvinylpirrolidone (PVP) on extraction of bacterial rRNA, in the presence of tannins from tropical legume fo
Pesquisa Agropecuária Brasileira. Publicado em: 2011
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46. Diagnóstico da susceptibilidade de populações de mosca-dos-chifres a inseticidas em Goiás, Tocantins e Distrito Federal.
RESUMO: A mosca-dos-chifres é considerada um sério problema econômico da pecuária e seu controle baseia-se, principalmente, na utilização de inseticidas químicos, fato que favorece o aparecimento de populações resistentes. No Brasil a resistência é um problema emergente e relatos sobre a ineficácia de produtos inseticidas são cada vez mais frequ
Planaltina. Publicado em: 2011
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47. Genetic diversity of Brazilian Pantaneiro horse and relationships among horse breeds.
The objective of this work was to evaluate the genetic diversity of Brazilian Pantaneiro horse by microsatellite markers, investigate the effect of genetic bottlenecks and estimate genetic differentiation among four horse breeds. Genetic variation was estimated through allele frequencies and mean breed heterozygosity. Nei´s genetic distances among the breed
Pesquisa Agropecuária Brasileira. Publicado em: 2011
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48. Genetic diversity between herds of Alpine and Saanen dairy goats and the naturalized Brazilian Moxotó breed.
Brazilian naturalized goat breeds are adapted to the semiarid conditions prevalent in the Northeast region of the country (which has the largest Brazilian goat heard) and represent an as yet uninvestigated source of genetic diversity. Currently, imported goat breeds are crossed with Brazilian naturalized goat breeds, endangering the genetic potential of the
Genetics and Molecular Biology. Publicado em: 2011