Estimates of population and demographic parameters of Ozotoceros bezoarticus (Artiodactyla, Cervidae) in Piraí do Sul, Paraná, southern Brazil [Estimativas de parâmetros populacionais e demográficos de Ozotoceros bezoarticus (Artiodactyla, Cervidae) em Piraí do Sul, Paraná, sul do Brasil]
Braga F.G.,Bio situ Projetos e Estudos Ambientais Ltda |
Kuniyoshi Y.S.,Federal University of Paraná
Iheringia - Serie Zoologia | Year: 2010
This study was conducted in two private properties in the municipality of Piraí do Sul (Paraná state, southern Brazil). Sixteen monthly visits were made each one lasting three days between February 2001 and May 2002. The study aimed at the observation of pampas deer biology (Ozotoceros bezoarticus Linnaeus, 1758), and the evaluation of main impacts to this population. We computed 1,065 observations of estimated 71.45 individuals. The average size of the groups was 2.29 (SD ± 0.55) animals, and the sexual ratio was 0.83. Isolated deer accounted for 40% of the observations, whereas the largest group comprised 10 individuals. It was recorded a peack period of births between September and November, although births were observed along all the studied period. Thirty-four deaths were recorded corresponding to a 47.6% death rate. The main causes of death were predatory actions by cougar Puma concolor (Linnaeus, 1771), hunting and individuals being run over by motor vehicles. The studied population is seriously endangered and it will not escape extinction unless certain policies to guarantee its conservation are adopted. These policies should include correct management of the areas and control of pressure vectors.
Landscape valuation based on the ecological requirements of 'Tayassu pecari 'and 'Tapirus terrestris' - a forest with araucaria, in Paraná state, Brazil [Valoração da paisagem com base nos requisitos ecológicos de tayassu pecari e de Tapirus terrestris - floresta com araucária, paraná, Brasil]
Vidolin G.P.,Bio situ Projetos e Estudos Ambientais Ltda |
Batista D.B.,Federal University of Paraná |
Wandembruck A.,Bio situ Projetos e Estudos Ambientais Ltda
Ciencia Florestal | Year: 2011
This study valuated the landscape of Lageado Grande farm (LGF), an area of 3,136.32 ha, located in General Carneiro, Palmas, and Bituruna, Paraná state, Brazil. The evaluation was based on an integral analysis of the ecological requirements of Tayassu pecari and Tapirus terrestris and the functional aspects of the LGF landscape. Land use and land cover were mapped, and the map was divided into 335 grids of 10 ha each, which were scored with pre-defined criteria. The scores of each aspect were integrated by multiplying the values and calculating the standard deviation and the mean to establish the classification intervals of the general quality of the landscape. The class gradient for the survival and the preservation of the analyzed species generated was: extremely important, very important, important, and of little importance. It was observed that 61.2% of LGF has environments relevant to the preservation of the species, composed by a forest predominantly of pine, broadleaves, lowlands, and some riparian forest patches of Iratim River. The results show that LGF comprises a mosaic of environments suitable for the occurrence and maintenance of these ungulates.
Vidolin G.P.,Bio Situ Projetos e Estudos Ambientais Ltda |
Biondi D.,Federal University of Paraná |
Wandembruck A.,Bio Situ Projetos e Estudos Ambientais Ltda
Revista Arvore | Year: 2011
The objective of this study was to analyze the landscape structure of Lageado Grande Farm (LGF), an area of 3,136.32 ha located in General Carneiro, Palmas, State of Tocantins, and Bituruna, in the centersouthern region of the State of Paraná. The analysis was based on the landscape metrics of Fragstats 3.3 software by using Arc Map 9.2 for the calculation of the proportion of the landscape connecting areas. The analysis showed that LGF had a predominantly forest soil cover matrix with native species; overall, the fragments were rectangular, that is, they were more subjected to border effects; there was a reduction of more than half of the original area of the farm, when border effect is considered, and the same class fragments were close to each other, favoring the structural connection of the landscape. The native forest fragments, even extensively and exploited, because of its forest continuity, can be considered areas of high value for biodiversity preservation.
Braga F.G.,Federal University of Paraná |
Santos R.E.F.,Bio situ Projetos e Estudos Ambientais Ltda |
Batista A.C.,Federal University of Paraná
Zoologia | Year: 2010
This research presents novel data on tree marking by the giant anteater, a large Neotropical mammal threatened in the state of Paraná and other areas of Brazil, and nearly threatened worldwide. Field work was carried out in the municipality of Jaguariaíva, Paraná (Southern Brazil) with the goal of evaluating the pine marking behavior of the giant anteater and ascertaining whether wildfires interfere with it. Anteater marks were searched for on the trunks of pine trees in stands as well as pine trees dispersed throughout the landscape. For each pine tree, the following features were recorded: height, diameter breast height (DBH), height of first branch, presence/absence of scratch marks, geographical location, substrate, and matrix. The total number of scratches, scratch directions, scratch length, and height of top mark were also recorded. The scratches were defined as horizontal or vertical. Tree scratching was directly observed in three instances. Ninety-one trees were measured in the study area. The differences between marked and non-marked pines were significant for DBH and height of first branch. All scratches were found on pines dispersed throughout the landscape. Trees with horizontal and vertical marks were significantly different in terms of DBH, first branch height, and top mark height. After a wildfire that affected part of the study area, 54% of the previously marked trees were marked anew. We suggest that the marking behavior is used for communication between conspecifics with overlapping home ranges, possibly during the mating season. Additionally, we advance the hypothesis that pine marking behavior becomes more frequent with increased population stress due to anthropic interference. © 2010 Sociedade Brasileira de Zoologia.
Vidolin G.P.,Bio Situ Projetos e Estudos Ambientais Ltda. |
Biondi D.,Federal University of Paraná |
Wandembruck A.,Bio Situ Projetos e Estudos Ambientais Ltda.
Floresta | Year: 2011
This study aimed to investigate the using area for use of tapir (Tapirus terrestris) along the Araucaria Ecological Corridor in relation to abundance, spatial distribution and area size. The research was carried out on 14 properties located on a spatial section of 659 km2 situated between the coordinates of 26°26'35" latitude S and 51°46'10" longitude W, and 26°12'19" latitude S and 51°24'45" longitude W. The points of occurrence of tapir were mapped based on interviews with local inhabitants and on tracks, paths, and other signs of its presence in the sampling areas. The areas were visited monthly during a period of 18 months. The points (UTM) where signs of the species were found had been marked by GPS and plotted on the map. The index of relative abundance was estimated based on all the events in which the specie was seen. Considering the values of relative abundance index for both groups of tapir studied, it was estimated an average of four individuals for an area of 4.314 ha or 43 km2.The relative density obtained was considered low. It is possible that hunting is the main cause of the population decline of the species in the studied region.