Fluctuating Asymmetry
Mostrando 13-24 de 30 artigos, teses e dissertações.
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13. Variação morfológica e assimetria flutuante de abelhas euglossinas (Hymenoptera, Apidae) em diferentes áreas e estações distintas em uma reserva de floresta estacional semidecidual
A sobrevivência dos organismos em ambientes heterogêneos e instáveis requer algumas vezes ajustes fisiológicos e morfológicos, envolvendo complexos mecanismos reguladores. Por outro lado, os organismos também possuem certa habilidade para resistir a distúrbios genéticos ou perturbações ambientais durante seu desenvolvimento, produzindo um fenótipo
Publicado em: 2007
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14. Morphometric analysis of Triatoma dimidiata populations (Reduviidae:Triatominae) from Mexico and Northern Guatemala
Triatoma dimidiata is one of the major vectors of Chagas disease in Latin America. Its range includes Mexico, all countries of Central America, Colombia, and Ecuador. In light of recent genetic analysis suggesting that the possible origin of this species is the Yucatan peninsula, we have analyzed populations from the state of Yucatan, San Luis Potosi, and Ve
Memórias do Instituto Oswaldo Cruz. Publicado em: 2005-08
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15. Population structure, fluctuating asymmetry and genetic variability in an endemic and highly isolated Astyanax fish population (Characidae)
Morphological and chromosomal markers were used to infer the structure and genetic variability of a population of fish of the genus Astyanax, geographically isolated at sinkhole 2 of Vila Velha State Park, Paraná, Brazil. Two morphotypes types were observed, the standard phenotype I and phenotype II which showed an anatomical alteration probably due to an i
Genetics and Molecular Biology. Publicado em: 2004
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16. Morfometria, assimetria flutuante e tabelas de vida e de fertilidade em Musca domestica L. (Diptera : Muscidae)
A colony of Musca domestica L. was established in the Entomology Laboratory, Department of Parasitology - UNICAMP, from adult flies collected in a poultry farm located in Santa Cruz da Conceição, São Paulo. The colony was used to determine life and fertility tables at different population densities as well as for studies on the morphometry and fluctuating
Publicado em: 2002
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17. Monitoramento da susceptibilidade de populações de musca domestica (Diptera: muscidae) a alguns inseticidas de terceira geração e seus efeitos subletais
Samples of six house fly (Musca domestica L.) populations were collected from areas (Botucatu, Itupeva, Moji das Cruzes, Moji Guaçu, Monte Mor and Pirassununga) of the state of São Paulo and kept in the laboratory to determine their susceptibility and sublethal effects to different types of larvicides: cyromazine, diflubenzuron, doramectin, ivermectin and
Publicado em: 1997
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18. Developmental Stability of DROSOPHILA MELANOGASTER under Artificial and Natural Selection in Constant and Fluctuating Environments
Populations of Drosophila melanogaster in constant 25° and fluctuating 20/29° environments showed increases in developmental stability, indicated by decreases in bilateral asymmetry of sterno-pleural chaeta number. In both environments, rates of decrease in asymmetry were greater under natural selection (control lines) than under artificial stabilizing sel
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19. Diazinon Resistance, Fluctuating Asymmetry and Fitness in the Australian Sheep Blowfly, Lucilia Cuprina
Genetic evidence suggests that the evolution of resistance to the insecticide diazinon in Lucilia cuprina initially produced an increase in asymmetry. At that time resistant flies were presumed to be at a selective disadvantage in the absence of diazinon. Subsequent evolution in natural populations selected modifiers to ameliorate these effects. The fitness
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20. Does fluctuating asymmetry of antlers in white-tailed deer (Odocoileus virginianus) follow patterns predicted for sexually selected traits?
Secondary sexual characters have been hypothesized to signal male quality and should demonstrate a negative relationship between the size of the trait and degree of fluctuating asymmetry because they are costly to produce. We collected morphometric and antler data from 439 white-tailed deer (Odocoileus virginianus) in Oklahoma, USA, in order to determine whe
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21. Asymmetry and external noise-induced free energy transduction.
The effect of fluctuations in rate constants on the kinetic behavior of cyclic reacting systems, caused by a fluctuating external parameter, is studied. It is shown (i) that the stochastic properties of the system can be analyzed analytically by using the usual master equation approach when the external parameter is fluctuating with discrete square pulses an
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22. Bumblebee preference for symmetrical flowers.
Fluctuating asymmetry, which represents small random deviations from otherwise bilateral symmetry, is a measure of the phenotypic quality of individuals indicating the ability of controlled development under given environmental and genetic conditions. I tested whether floral symmetry reliably reflects phenotypic quality measured in terms of pollinator reward
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23. Directional and fluctuating asymmetry in finger and a-b ridge counts in psychosis: a case-control study
BioMed Central.
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24. Environmental and Genetic Effects on the Asymmetry Phenotype: Diazinon Resistance in the Australian Sheep Blowfly, Lucilia Cuprina
The asymmetry phenotype of diazinon-resistant flies lacking a fitness/asymmetry Modifier (+/+; R/-) was dominant and independent of developmental temperature, larval density and diazinon concentration. Asymmetry score, pooled over three bristle characters, was ~50% greater for these phenotypes than for those of modified genotypes (M/-; -/-) and unmodified su