Polyphenism
Mostrando 1-10 de 10 artigos, teses e dissertações.
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1. Dimorphism and allometry of Systaltocerus platyrhinus and Hypselotropis prasinata (Coleoptera: Anthribidae)
Males of sexually dimorphic anthribid species display structural modifications that suggest sexual selection. Polyphenism, which is expressed through morphological and behavioral novelties, is an important component of the evolutionary process of these beetles. In this study, we endeavored to ascertain the presence of variations in selected monomorphic trait
Zoologia (Curitiba). Publicado em: 2014-02
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2. Dimorfismo sexual e polimorfismo no gênero Ptychoderes Schoenherr, 1823 (Coleoptera Anthribidae, Anthribinae, Ptychoderini) / Sexual dimorphism and polymorphism in genus Ptychoderes Schoenherr, 1823 (Coleoptera, Anthribidae, Anthribinae)
O dimorfismo sexual exibido por machos polifênicos em algumas espécies do gênero Ptychoderes envolve variação no rostro, antena e ventritos. A existência de polifenismo pode ser um importante componente no processo evolutivo por meio de novidades morfológicas e comportamentais. O objetivo desse estudo foi determinar a variação em caracteres morfomé
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/02/2011
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3. Identification of differentially expressed genes in queen and worker castes of Melipona quadrifasciata / Identificação de genes diferencialmente expressos nas castas da rainha e operaria de Melipona quadrifasciata
Caste polyphenism is a multifaceted phenomenon, most evident in the marked differences in reproductive capacity and longevity between queens and workers. In the present study, the stingless bee Melipona quadrifasciata anthidioides was chosen to investigate differences in gene expression between newly emerged adult queens and workers. This study has focused o
Publicado em: 2005
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4. Behavioural phase polyphenism in the Australian plague locust (Chortoicetes terminifera)
Swarming and the expression of phase polyphenism are defining characteristics of locust species. Increases in local population density mediate morphological, physiological and behavioural changes within individuals, which correlate with mass marching of juveniles in migratory bands and flying swarms of adults. The Australian plague locust (Chortoicetes termi
The Royal Society.
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5. Evolution of pathogen virulence: the role of variation in host phenotype.
Selection on pathogens tends to favour the evolution of growth and reproductive rates and a concomitant level of virulence (damage done to the host) that maximizes pathogen fitness. Yet, because hosts often pose varying selective environments to pathogens, one level of virulence may not be appropriate for all host types. Indeed, if a level of virulence confe
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6. Caste- and development-associated gene expression in a lower termite
Social insects such as termites express dramatic polyphenism (the occurrence of multiple forms in a species on the basis of differential gene expression) both in association with caste differentiation and between castes after differentiation. We have used cDNA macroarrays to compare gene expression between polyphenic castes and intermediary developmental sta
BioMed Central.
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7. Differential gene expression between developing queens and workers in the honey bee, Apis mellifera
Many insects show polyphenisms, or alternative morphologies, which are based on differential gene expression rather than genetic polymorphism. Queens and workers are alternative forms of the adult female honey bee and represent one of the best known examples of insect polyphenism. Hormonal regulation of caste determination in honey bees has been studied in d
The National Academy of Sciences.
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8. Coping with crowds: Density-dependent disease resistance in desert locusts
Parasite transmission generally exhibits some form of positive density dependence. Thus, as population density increases, so too does the per capita risk of becoming infected. Under such circumstances, natural selection should favor individuals that use cues associated with population density to determine the optimal allocation of resources to disease resist
National Academy of Sciences.
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9. Reaction norms with bifurcations shaped by evolution.
Two versions of a model for the evolution of seasonal polyphenism investigate the evolution of reaction norm bifurcation and branching. The first version is without a specific submodel for morphological development and the second has an explicit developmental map. Version 1 is evolutionarily relatively unconstrained: (i) reaction norms are specified by matri
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10. Soldier caste-specific gene expression in the mandibular glands of Hodotermopsis japonica (Isoptera: Termopsidae)
Although “polymorphic castes” in social insects are well known as one of the most important phenomena of polyphenism, few studies of caste-specific gene expressions have been performed in social insects. To identify genes specifically expressed in the soldier caste of the Japanese damp-wood termite Hodotermopsis japonica, we employed the differential-dis
The National Academy of Sciences.