Variação espacial e influência do habitat na estrutura de comunidades de pequenos mamíferos em áreas de campo rupestre no Distrito Federal

Abstract

Spatial variation and the habitat influence in the structure of communities of small mammals in areas of rocky fields in the Federal District. Biota Neotrop. 10(1): http:// www.biotaneotropica.org.br/v10n1/en/abstract?article+bn00410012010. Abstract:In the present study, we investigated the communities of small mammals in rocky fields in the Federal District. We examined the composition, abundance and richness and their relation to the structure of the habitat and if there is significant spatial variation in species composition among sites of rocky fields. Small mammals were sampled by live-trapping techniques in seven sites. The total effort for the seven sites was 5.680 trap-nights; we captured 157 individuals in eight species of rodents. Calomys tener and Cerradomys scotti were the most abundant species in the study sites, with 47.1 and 18.0% of total individuals, respectively. The results showed that the areas of rocky fields of the Federal District have a fauna of small mammals (average of four, range of variation of three to five species), comparable to other Cerrado physiognomies. The complexity of the habitat proved to be a major determinant in the composition of communities of small mammals in rocky fields. There was a distinction between communities of small mammals of the sites of APA Gama e Cabeça do Veado and the sites of the APA de Cafuringa. There was influence of the distance between the places on the composition of species with decreasing similarity with increasing distance among sites. The differences in environmental conditions, the structure of the habitat and the fact that it was possible two biogeographical regions may explain the faunal differences between the two regions. Keywords: Cerrado, rodents, habitat structure, complexity. Resumo:No presente estudo foram investigadas as comunidades de pequenos mamíferos em campos rupestres do Distrito Federal (DF). Foram analisadas a composição, abundância e riqueza e suas relações com a estrutura do habitat e se existe variação espacial significativa na composição de espécies entre os sítios de campo rupestre. Os pequenos mamíferos foram estudados com o método de marcação e recaptura em sete sítios. O esforço total para os sete sítios foi de 5.680 armadilhas-noite, sendo capturados 157 indivíduos e oito espécies de roedores. Calomys tener e Cerradomys scotti foram as espécies mais abundantes do estudo, com 47,1 e 18,0% do total de indivíduos, respectivamente. Ambas estavam presentes em todos os sítios amostrados. Os resultados mostraram que as áreas de campo rupestre do DF apresentam uma fauna de pequenos mamíferos (média de quatro com amplitude de variação de três a cinco espécies), comparáveis a de outras fisionomias de Cerrado. A complexidade do habitat mostrou-se como um dos principais determinantes na composição das comunidades de pequenos mamíferos em campo rupestre. Houve distinção entre as comunidades de pequenos mamíferos dos sítios da APA Gama e Cabeça de Veado e dos sítios da APA de Cafuringa. Foi constatada influência da distância ent...

Survey of Small Mammals (Rodentia and Didelphimorphia) in a Cerrado Reserve: Central Espinhaço Mountain Range, Brazil

“…Capture sites of T. lasiotis in the Cerrado biome have mostly been in savanna-like formations such as open grasslands and open grasslands with scattered shrubs ("campo sujo") (Ribeiro et al 2011. This taxon is considered rare in scientific collections and seemingly rare in studies in all vegetation types of the Cerrado (Santos & Henriques 2010. In the Espinhaço Range, the only other known record of T. lasiotis is in a protected area in Parque Nacional da Serra do Cipó (Lessa et al 2008, Câmara & Oliveira 2012.…”

Personality and behavioural syndrome in Necromys lasiurus (Rodentia: Cricetidae): notes on dispersal and invasion processes

“…Since the species does not show limitations in habitat use, it is sometimes considered a generalist (e.g. Henriques and Alho 1991;Bonvicino et al 2002;Santos and Henriques 2010). The species occurs in all sorts of open areas and is currently abundant in anthropogenic vegetation (agriculturally managed and pasture areas) and in very disturbed areas within the Atlantic Forest biome in ecotone zones (Bonvicino et al 2002(Bonvicino et al , 2008Estavillo et al 2013), expanding regionally its distribution to these newly disturbed areas produced by anthropic activities.…”

Natural history and demography of Thalpomys lasiotis (Thomas, 1916), a rare and endemic species from the Brazilian savanna

“…Other studies on the taxonomic status and phylogeny of Akodontini (D'Élia 2003) and karyologic studies of Thalpomys have been published in the last 30 years (Armada et al 1983;Yonenaga-Yassuda et al 1987;Andrade et al 2004), but information about the ecology and natural history is lacking for both species. A few studies on cerrado small mammals have registered the occurrence of Thalpomys (e.g., Bonvicino et al 1993;Santos and Henriques 2010), but they provide little, if any, information about the ecology of both species, and the scarce information available is restricted to broader studies about small mammals communities in the cerrado biome (e.g., Dietz 1983;Mares et al 1989;Alho 2005).…”