Sympatric Speciation
Mostrando 1-12 de 33 artigos, teses e dissertações.
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1. Molecular divergence in the timeless and cpr genes among three sympatric cryptic species of the Anopheles triannulatus complex
Anopheles triannulatus s.l. is a malaria vector with a wide geographic distribution, ranging from Argentina-Nicaragua and Trinidad. Here we analysed sequences of two genes, timeless and cpr, to assess the genetic variability and divergence among three sympatric cryptic species of this complex from Salobra, central-western Brazil. The timeless gene sequences
Memórias do Instituto Oswaldo Cruz. Publicado em: 2011-08
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2. Especiação sem barreiras e padrões de diversidade / Speciation without barriers and diversity petterns
Nesse trabalho, estudamos doismecanismos de formação de espécies. No primeiro deles, consideramos um modelo espacial de especiação neutra totalmente probabilístico, sem barreiras geográficas ou interações ecológicas. A população evolui devido a influência de reprodução sexuada, mutações e recombinação. O modelo é baseado em acasalamento s
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/06/2010
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3. Aplicações de mecânica estatística a especiação simpátrica e inferência aproximativa / Applications of statistical mechanics to sympatric speciation and aproximative inference
This thesis presents applications of the framework of Statistical Mechanics to two independent problems. The first corresponds to a computational model for the evolution of Assortative Mating in the Sympatric Speciation process; and the second a learning algorithm built by means of a Bayesian Inference approach. In the biological problem each individual in a
Publicado em: 2009
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4. Reproductive isolation between sympatric and allopatric Brazilian populations of Lutzomyia longipalpis s.l. (Diptera: Psychodidae)
Lutzomyia longipalpis s.l., the main vector of Leishmania chagasi in Latin America, is a species complex although the exact number of siblings is yet unknown. In Brazil, the siblings differ in male copulatory courtship songs and pheromones that most certainly act as pre-zygotic reproductive barriers. Here we analysed the reproductive isolation between three
Memórias do Instituto Oswaldo Cruz. Publicado em: 2008-03
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5. Computer simulation of sympatric speciation with Penna ageing model
One species is simulated to split into two separate species via random mutations, even if both populations live together in the same environment. This speciation is achieved in the Penna bitstring model of biological ageing, with modified Verhulst factors, and in part by additional bitstrings regulating phenotype and mate selection.
Brazilian Journal of Physics. Publicado em: 2003-09
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6. Analise citogenetica e do DNA mitocondrial de populações de Hyla semiguttata (Anura, Hylidae) e especies relacionadas
Polymorphic populations of Hyla semiguttata and related species in the Hyla pulchella group were analyzed cytogenetically and by comparing the sequences of the cytochrome b gene and the control region of mitochondrial DNA. All H semiguttata populations showed polymorphism in color pattern, body size and acoustics. The cytogenetic analysis showed a karyotype
Publicado em: 2002
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7. Sympatric speciation through intraspecific social parasitism
Sympatric speciation through intraspecific social parasitism has been proposed for the evolution of Hymenopteran workerless parasites. Such inquilines exploit related host taxa to produce their own sexual offspring. The relatedness of inquilines to their hosts has been generalized in Emery's rule, suggesting that social parasites are close or the closest
National Academy of Sciences.
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8. Sympatric speciation as a consequence of male pregnancy in seahorses
The phenomenon of male pregnancy in the family Syngnathidae (seahorses, pipefishes, and sea dragons) undeniably has sculpted the course of behavioral evolution in these fishes. Here we explore another potentially important but previously unrecognized consequence of male pregnancy: a predisposition for sympatric speciation. We present microsatellite data
National Academy of Sciences.
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9. Darwin's finches: Population variation and sympatric speciation
The classical model of the adaptive radiation of Darwin's finches is one of repeated speciation in allopatry. Evidence presented here suggests that sympatric specification may have contributed to the radiation. On Isla Genovesa Geospiza conirostris displays several features that are consistent with a model of sympatric speciation. Males are polymorphic in so
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10. Sexual selection at the protein level drives the extraordinary divergence of sex-related genes during sympatric speciation.
An increasing number of molecular studies are indicating that, in a wide variety of species, genes directly related to fertilization evolve at extraordinarily high rates. We try to gain insight into the dynamics of this rapid evolution and its underlying mechanisms by means of a simple theoretical model. In the model, sexual selection and sympatric speciatio
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11. Host fidelity is an effective premating barrier between sympatric races of the apple maggot fly.
Models of sympatric speciation for phytophagous insects posit a central role for host plant-associated mating as a premating isolating mechanism in lieu of geographic barriers to gene flow. Here, by means of three mark-and-recapture studies, we confirm that host fidelity (i.e., the tendency of an insect to reproduce on the same host species that it used in e
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12. Fruit odor discrimination and sympatric host race formation in Rhagoletis
Rhagoletis pomonella is a model for incipient sympatric speciation (divergence without geographic isolation) by host-plant shifts. Here, we show that historically derived apple- and ancestral hawthorn-infesting host races of the fly use fruit odor as a key olfactory cue to help distinguish between their respective plants. In flight-tunnel assays and field te
National Academy of Sciences.