Full text
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| Author(s): |
Maria Carolina Lyra Jorge
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Instituto de Biociências (IBIOC/SB) |
| Defense date: | 1999-05-17 |
| Examining board members: |
Vania Regina Pivello;
Jose Carlos Motta Junior;
Mario de Vivo
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| Advisor: | Vania Regina Pivello |
| Abstract | |
The work has been performed in a landscape coposed of seven different Brazilian savanna physiognomie and an eucalyptus forest, adjacent of the Brazilian savanna. Small mammals, during 12 moths, were sampled, every 30 days for 3 consecutive nights, in dry and wet seasons, through 2 kinds of small mammal traps: Tomahawk style, arranged along trails, every twenty 5 meters, amounting a 114 traps sampling all physiognomies; and a pitfall satation, with four 40 centimeter deep buckets each, in each physiognomy. The capture effort was 4 896 tapnights and 324 pitfall/stations/day where a 121 individuals were captured, in 12 genera, with 8 rodents (Oligoryzomys sp, Calomys sp, Akodon sp, Oryzomys sp, Bolomys lasiurus, Pseudorizomys simplex, Oxymicterus sp, Nectomys squamipes) and 4 marsupials (Didelphis albiventris, Marmosa sp, Gracilinanus microtarsus, Micouerus cinereus). The community dominant specie is Oligoryzomys sp. The N.squamipes always appears closely related to water. In contrast, B. lasiurus, P. simplex and Oximycterus sp occur in open field regions. The marsupials G. microtarsus and Marmosa sp prefer Brazilian savannas shrubby vegetation, whereas M. cinereus, P. opossum and D. albiventris commonly use forested vegetation, and the llatter, side with the Oligoryzomys sp are the only ones to exploit the reforest areas. The largest number of captures occurred in the transition forest between the cerradão and the riparian forest. Despite of the fact that, pitfalls may seem a much more efficient method than Tomahawk traps themselves, said work has proved both methods to be complementary for those species were captured through pitfalls, with rare exceptions, were captured through Tomahawk traps as well. The smaller body mass species were captured through pitfalls, like Oligoryzomys sp, Calomys sp, G. microtarsus, Marmosa sp, whereas the bigger body mass ones were captured through Tomahawk traps, such as N. squamipes, P. simplex, Oryzomys sp, Oxymicterus sp, M. cinereus, D. albiventris. Only two species were captured through both methods Akodon sp and B. lasiurus. The Jaccard index (=0,17) performed a result that corroborates the idea that the two kinds of traps are complementary in a small mammals community study. (AU) | |