Natural history and demography of <Emphasis Type="BoldItalic">Thalpomys lasiotis</Emphasis> (Thomas, 1916), a rare and endemic species from the Brazilian savanna |
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Authors: | Raquel Ribeiro Clarisse R Rocha Jader Marinho-Filho |
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Institution: | 1.Departamento de Zoologia,Campus Universitário Darcy Ribeiro, Instituto de Biologia, Universidade de Brasília,Brasília, DF,Brazil |
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Abstract: | Hairy-eared cerrado mouse Thalpomys lasiotis is an endemic species of the cerrado biome. It can be found in open habitats, but its distribution is patchy and population
numbers are unknown. In this paper, we describe, for the first time, aspects related to the ecology and natural history of
T. lasiotis, detailing demographic parameters such as population densities, reproduction, home range, and longevity of this endemic and
rare species. We captured, marked, and recaptured 55 individuals of T. lasiotis in águas Emendadas Ecological Station, located in the northeast of the Federal District, Brazil. We found significant differences
on population numbers and densities between the dry and wet seasons. Densities and population numbers apparently are affected
by the seasonality of food resources. Moreover, the breeding season is seasonal, and both males and females were reproductively
active during the wet season. T. lasiotis showed a permanence time ranging from 2–9 months, which means that individuals can survive for at least 9 months in natural
habitats. The home ranges of males and females of T. lasiotis were not significantly different. However, males have larger home ranges than females and the mean distance moved by males
was higher than the distance moved by females, which is consistent with the hypothesis that males belonging to polygynous
species tend to move greater distances to avoid agonistic encounters and to search sexual partners. |
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