Tese em PDF - departamento de engenharia florestal - ufpr ...

ABSTRACT
Dense Rain Forest (Atlantic Forest) and Mixed Ombrophilous Forest (Araucaria
Forest) have suffered in recent decades one of the highest levels of degradation of
habitats and hence biodiversity loss rather than property speculation and
advancement of agricultural and pastoral boundaries. However, currently it has to
work in various ways to minimize these actions, seeking to understand the
operation of these systems based on knowledge of the elements which compose it.
Thus, it is necessary the knowledge of ecological processes between plant
communities and animals and that is, which were described and compared the
communities of marsupials and small rodents in four different environments in the
Northern Part of the State of Santa Catarina, and investigated some population
parameter of Akodon gr. cursor. This study selected four sampling sites called
riparian area with “capoeirinha” stage (A1), riparian area dominated by
regeneration of grasses (A2), pine plantation (A3) and remnant of native forest
(A4). In each sampling site was installed a grid-capture 120x30m, with 105 traps
each. For each tagged individual were recorded the following data: species, point
of capture, sex, age, then were labeled with earrings, rings or holes in the ears and
then released at the same point of capture. In the period November 2005 to July
2007 were registered 13 species of these five were marsupials (Didelphis
albiventris, Didelphis aurita, Gracilinanus microtarsus, Philander frenatus e
Monodelphis sorex) and eight small rodents (Akodon gr. cursor, Delomys dorsalis,
Euryzygomatomys spinosus, Nectomys squamipe, Olygoryzomys nigripes,
Oryzomys sp., Oxymycteru aff. judex e Thaptomys nigrita). The effort to capture
total was 7875 traps-night and the whole is 6300 traps-night on the floor and 1575
traps-night in the understorey fragment of forest and successful total catch of
1.36% for marsupials and 10.51% for small rodents. To Marsupials, the
environment with greater success was the capture of the remnant of native forest
while to rodents was the riparian area dominated by regeneration of grasses. For
both groups the environment with less success the capture was the pine plantation.
Among the marsupial Monodelphis sorex was the specie that had the highest
relative abundance (42.06%) and small rodents the highest relative abundance
was obtained for Akodon gr. cursor. The relative abundance of environment,
recorded by a higher abundance in remnant of native forest (37.33%) for
marsupials and riparian area dominated by regeneration of grasses (29.11%) for
small rodents. Among the marsupials, Monodelphis sorex was the most abundant
species, but no individual was recorded in the remnant of native forest. Shannon-
'
Wiener diversity index for both groups was H = 1,
32 , with the remnant of native
forest had more diversity, both for marsupials as for small rodents. To marsupials
the Morisita index of similarity indicated great similarity between the riparian area
with “capoeirinha” and riparian area dominated by regeneration of grasses and low
similarity between the riparian area with “capoeirinha” and the remnant of native
forest. For small rodents, we observed a high similarity among all the environments
sampled. The population parameter was evaluated for Akodon gr. cursor, which
showed a sex ratio skewed to males and average population size of 93.36 ind./ha.
Survival rates and recruitment out of 0.559% and 1.558% respectively. The results
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