Regra das Ilhas e genética quantitativa evolutiva do tamanho corporal em Elephas maximus borneensis
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2020-03-24
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Universidade Federal de Goiás
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The Islands Rule describes that there is a tendency, especially in mammals, that species that are large on the continent tend to suffer from dwarfism when isolated on an island, while those that have small size on the continent tend to suffer from gigantism. Elephas maximus borneensis is small in size compared to other elephants of the genus, and there is also controversy about its condition as a natural subspecies of Borneo, when it possibly arrived on the island and the degree of isolation. For this reason, starting from the Evolutionary Quantitative Genetic Model based on the individual, we incorporate a more realistic parameterization, assuming the dioecious subspecies with sexual reproduction, balanced sexual proportion and random monogamous mating, with generations without overlapping. In addition, we use the adaptive peak on the pre-established island
and also evolutionary characteristics for island populations such as: heritability, migration, inbreeding and mutation. We simulated four scenarios based on the hypotheses of colonization and evolution of the elephant's body size, taking into account the time of colonization and the possible ancestral body weight. We compared the results of the simulations with the molecular data of this subspecies and the historical records. We conclude then that among the four scenarios, only the third was supported by all the data assumed in the present study, thus, the most accepted hypothesis, describing that possibly the subspecies of Elephas maximus borneensis suffered an isolation of 11 thousand to 18 thousand years in Java and, about 700 years ago, was subjected to two subsequent founding events, arriving then on the Island of Borneo.
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SILVA, F. N. Regra das Ilhas e genética quantitativa evolutiva do tamanho corporal em Elephas maximus borneensis. 2020. 40 f. Dissertação (Mestrado em Genética e Biologia Molecular) - Universidade Federal de Goiás, Goiânia, 2020.