Phenotypic Diversification
Mostrando 1-12 de 32 artigos, teses e dissertações.
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1. Can plant hybridization and polyploidy lead to pollinator shift?
ABSTRACT Events of both hybridization and polyploidy are capable of completely restructuring the genome, modifying phenotypic traits and affecting ecological interactions. For plants, these changes may affect floral traits that are important for interactions with pollinators, which could lead to shifts in pollinator behavior and taxa between hybrids/polyploi
Acta Bot. Bras.. Publicado em: 2020-06
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2. Skull shape and size variation within and between mendocinus and torquatus groups in the genus Ctenomys (Rodentia: Ctenomyidae) in chromosomal polymorphism context
Abstract We tested the association between chromosomal polymorphism and skull shape and size variation in two groups of the subterranean rodent Ctenomys. The hypothesis is based on the premise that chromosomal rearrangements in small populations, as it occurs in Ctenomys, produce reproductive isolation and allow the independent diversification of populations
Genet. Mol. Biol.. Publicado em: 2018
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3. How specialists can be generalists: resolving the "parasite paradox" and implications for emerging infectious disease
The parasite paradox arises from the dual observations that parasites (broadly construed, including phytophagous insects) are resource specialists with restricted host ranges, and yet shifts onto relatively unrelated hosts are common in the phylogenetic diversification of parasite lineages and directly observable in ecological time. We synthesize the emergin
Zoologia (Curitiba). Publicado em: 2010-04
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4. Evolução da morfologia floral e estrutura de comunidades em um clado de Lianas Tropicais (Bignonieae, Bignoniaceae) / Evolution of floral morphology and community structure of a tropical Clade of Lianas (Bignonieae, Bignoniaceae)
As angiospermas são um dos grupos mais diversos de organismos, e grande parte dessa diversidade deve-se às muitas formas florais existentes. Devido a isso, determinar os padrões de variação floral e os fatores históricos e ecológicos que levaram à evolução desta alta diversidade floral é essencial para entender os processos que dirigem a diversifi
Publicado em: 2010
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5. Salmonella spp : avaliação epidemiológica de surtos notificados no Paraná e caracterização de isolados epidêmicos e de origem avícola
Salmonella enterica subsp. enterica serovar Enteritidis (SE) is the main pathogen responsible for foodborne outbreaks in Paraná. Epidemiological surveillance of SE requires effective methods for subtyping and investigation of genetic diversity and origin of isolated ones, considering that this serovar presents high degree of genetic homogeneity. The use of
Publicado em: 2009
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6. Research Article Comparing covariance matrices: random skewers method compared to the common principal components model
Comparisons of covariance patterns are becoming more common as interest in the evolution of relationships between traits and in the evolutionary phenotypic diversification of clades have grown. We present parallel analyses of covariance matrix similarity for cranial traits in 14 New World Monkey genera using the Random Skewers (RS), T-statistics, and Common
Genetics and Molecular Biology. Publicado em: 2007-03
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7. Caracterização genética de populações de cupuaçuzeiro, Theobroma grandiflorum (Willd. ex. Spreng.) Schum., por marcadores microssatélites e descritores botânico-agronômicos. / Genetic characterization of cupuassu theobroma grandiflorum (willd. ex. spreng.) schum. populations by microsatellite markers and botanic-agronomic descriptors.
This work had the objectives to characterize and compare the genetic structure of seven populations of cupuassu, Theobroma grandiflorum (Willd. ex Spreng.) Schum., a fruit tree native to the Brazilian Amazon using microsatellite markers and botanic-agronomic descriptors; and to investigate the cupuassu mating system. The genetic structure of seven population
Publicado em: 2003
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8. Conservatism and diversification of plant functional traits: Evolutionary rates versus phylogenetic signal
The concepts of niche conservatism and adaptive radiation have played central roles in the study of evolution and ecological diversification. With respect to phenotypic evolution, the two processes may be seen as opposite ends of a spectrum; however, there is no straightforward method for the comparative analysis of trait evolution that will identify these c
National Academy of Sciences.
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9. Directional selection is the primary cause of phenotypic diversification
Selection is widely accepted as the principal force shaping phenotypic variation within populations. Its importance in speciation and macroevolution has been questioned, however, because phenotypic differences between species or higher taxa sometimes appear to be nonadaptive. Here, we use the quantitative trait locus (QTL) sign test to evaluate the importanc
National Academy of Sciences.
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10. Population Structure in Daphnia Obtusa: Quantitative Genetic and Allozymic Variation
Quantitative genetic analyses for body size and for life history characters within and among populations of Daphnia obtusa reveal substantial genetic variance at both hierarchical levels for all traits measured. Simultaneous allozymic analysis on the same population samples indicate a moderate degree of differentiation: G(ST) = 0.28. No associations between
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11. Dilute passage promotes expression of genetic and phenotypic variants of human immunodeficiency virus type 1 in cell culture.
We have studied the extent of genetic and phenotypic diversification of human immunodeficiency virus type 1 (HIV-1) upon 15 serial passages of clonal viral populations in MT-4 cell cultures. Several genetic and phenotypic modifications previously noted during evolution of HIV-1 in infected humans were also observed upon passages of the virus in cell culture.
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12. The hypocone as a key innovation in mammalian evolution.
The hypocone, a cusp added to the primitively triangular upper molar teeth of therian mammals, has evolved convergently > 20 times among mammals during the Cenozoic. Acquisition of the hypocone itself involves little phenotypic change, but subsequent diversification of groups possessing the hypocone may be greatly enhanced. Our analysis of the Cenozoic mamma