Impactos da duplicação de rodovias : variação da mortalidade de fauna na BR 101 Sul
Abstract
Roadkill and isolation of populations due to the barrier effect can be considered the main
direct impacts of roads on wildlife. Mammals by behavioral, size and charisma features
are one of the groups of vertebrates that require mitigation for mortality, as they are also
among the most seriously injured on roads. An important approach to effectively mitigate
roadkill on highways is to locate the points where roadkill are concentrated. The objective
of this study was to evaluate the variation in mortality of mammals due to the duplication
of the BR 101 highway south. In addition to the K Ripley aggregation analysis, were
generated habitat suitability models (MAH) to identify favorable locations roadkill
species, using the model functional groups for prediction of highway stretches with more
chances to roadkill. It was recorded 21 taxa of mammals get hit, being the most abundant
gender Didelphis (n = 721), followed by Cerdocyon thous (n = 108). The abundance of
carcasses decreases between before and after the duplication (F 18.04 p = <0.001).
Hotspots were not overlapped between the periods analyzed, indicating that some
explanatory factor has changed over the work. Observing the variables that contributed
most to the models for each functional group, we noted that there were differences in the
most influential variables for each functional group in different periods. Of the nine
generated models, we note that six variables contributed more than 20% in different
models. There were differences between the periods before, during and after the
duplication of the variables that contributed most or contribution value in functional
groups. These differences may reflect the change in the distribution of roadkill among
highway doubling periods. Both approaches demonstrated that there have been changes
in the magnitude and distribution of roadkill in the period prior to the period after
duplication. So a highway with two paviments differ from a highway with four paviments
about how the mammals react in terms of movement and relationship to landscape.