Populational Variation
Mostrando 13-24 de 38 artigos, teses e dissertações.
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13. Dinâmica populacional e efeitos de variáveis ambientais sobre a fauna de pequenos mamíferos em um fragmento de floresta com araucária no sul do Brasil
Natural populations of small rodents fluctuate continually over time and the population dynamics of any living organism are shaped by both intrinsic and extrinsic factors. Small mammals populations can show a continuum dynamic activity, ranging from stability to regular cycles of variable amplitude. The species dynamics is also known to be influenced by the
Publicado em: 2010
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14. The karyotype of Nothoscordum arenarium Herter (Gilliesioideae, Alliaceae): a populational and cytomolecular analysis
The genus Nothoscordum Kunth comprises approximately 20 species native to South America. Karyologically, the genus is remarkable for its large chromosomes and Robertsonian translocations. Variation in chromosome number has been recorded in a few polyploid species and it is unknown among diploids. This study presents the chromosome number and morphology of 53
Genetics and Molecular Biology. Publicado em: 23/01/2009
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15. Genetic and morphological patterns in populations of Culex quinquefasciatus (Diptera:Culicidade). / Padrões genético-morfológicos em populações de Culex quinquefasciatus (Diptera: Culicidae).
Culex quinquefasciatus is a pantropical synanthropic species of great medical interest. Several attempts to control this species have fail due to its microvelution of resistance to insecticides. In order to detect populational variation indicative of microevolution, two populational samples from State of São Paulo were compared: São Paulo municipality (Par
Publicado em: 2009
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16. Variações no gene yolk em moscas das frutas do grupo fraterculus
Species of the fraterculus group are associated to the biggest damages to fruit crops due to the fact that they attack indiscriminately green and ripe fruits, making them pests of great economic importance. These species are hard to tell apart, even showing some potential criptic species. The understanding of the populational structure and biology of this sp
Publicado em: 2009
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17. PARÂMETROS GENÉTICOS POPULACIONAIS COMO INDICADORES DE SUSTENTABILIDADE EM POPULAÇÕES NATURAIS DE PIMENTA ROSA - Schinus terebinthifolius RADDI. (Anacardiaceae) NO BAIXO CURSO DO RIO SÃO FRANCISCO - SE/AL. / POPULATIONAL GENETIC PARAMETERS AS SUSTAINABILITY INDICATORS IN NATURAL POPULATIONS OF RED PEPPER Schinus terebinthifolius RADDI (Anacardiaceae), IN LOW SÃO FRANCISCO RIVER-SE/AL.
The conservation of forest species requires the prior knowledge of genetic parameters belonging to the population, to help to design strategies for this purpose. This study aimed to evaluate genetic parameters and suggest indicators of sustainability in populations of Schinus terebinthifolius Raddi. aiming the conservation and maintenance of diversity in thi
Publicado em: 2009
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18. Desenvolvimento de microssatelites e analise populacional de especies de Physalaemus do grupo "cuvieri" (Anura, Leiperidae) / Microsatellites development and populational analysis of Physalaemus species of the "cuvieri" group (Anura, Leiperidae)
Even though many amphibian species are among the most endangered animals, the knowledge about their genetic variability and population genetic structure is still limited. In the present work, natural populations of the barker frog Physalaemus cuvieri were analyzed for genetic variability and differentiation using microsatellites, considering its wide geograp
Publicado em: 2009
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19. Revisão taxonômica e variação geográfica do gênero Erythrolamprus Boie, 1826 (Serpentes, Xenodontinae) / Taxonomic revision and geographic variation of the genus Erythrolamprus Boie, 1826 (Serpentes, Xenodontinae)
The genus Erythrolamprus (Serpentes, Xenodontinae) includes six species presently recognized, widely distributed in South and Central America and showing a complex taxonomic history. Due to general uniformity in overall pholidotic patterns, diagnostic features of such taxa are mostly associated to coloration and have never been tested in a comprehensive appr
Publicado em: 2008
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20. Sistemática e biogeografia do grupo Rhinella marina (Linnaeus, 1758) (Anura: Bufonidae)
This research aims the study of systematics and biogeography of the species in Rhinella marina group (Linnaeus, 1758). The present dissertation was structured in three chapters. The irst chapter presents the description of two new species, throughout central Brazil, and also focuses discussions about the taxonomy of the group. The second chapter investigated
Publicado em: 2008
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21. Variação sazonal de Triozoida limbata (Hemiptera: Triozidae) e inimigos naturais em goiabeira / Seasonal variation of Triozoida limbata (Hemiptera: Triozidae) and natural enemies in guava plants
Triozoida limbata is one of the most important pests of guava plants. Their nymphs attack young leaves and buds, causing serious damages. Basic studies of population dynamics and determination of factors that regulate the population growth are necessary for the development of integrated programs management of this pest. Agents of natural biological control a
Publicado em: 2008
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22. PCR-RFLP analysis of non-coding regions of cpDNA in Araucaria angustifolia (Bert.) O. Kuntze
The Araucaria angustifolia (Bert.) O. Kuntze, also named the "paraná pine" (‘pinheiro-do-Paraná’ in Portuguese), is a native conifer species naturally occurring in the Brazilian Tropical Atlantic Forest which in Brazil is mostly limited to the southern Brazilian states of Paraná, Santa Catarina and Rio Grande do Sul. Chloroplast DNA markers (cpDNA) ar
Genetics and Molecular Biology. Publicado em: 2007-03
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23. Population ecology of Psychotria suterella Mull. Arg. (Rubiaceae) in fragmented Atlantic rainforest landscape / Ecologia de populações de Psychotria suterella Mull. Arg. (Rubiaceae) em uma paisagem fragmentada de Mata Atlantica
There is wide variation in the sensibility levei of plant populations to the decrease of their natural habitats. There are also few studies in priority conservation areas. The objective of this study is to test if the discontinuity and quality of the Atlantic Rainforest affect the structure, alometric relations, dynamics, and seed germinability of the popula
Publicado em: 2006
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24. Análise filogeográfica de Astyanax scabripinnis (Characiformes, Characidae) da região de Campos do Jordão (SP).
The lambaris, which include small Astyanax scabripinnis fish, inhabit the headwaters of small streams, forming well known populational isolates. These populations are possibly inbred, presenting little or no gene flow and reduced size. It is believed that these characteristics have aided the fixation of a pronounced karyotypic variability, contributing to th
Publicado em: 2006