Abstract:ABSTRACT. Estimates of population and demographic parameters of Ozotoceros bezoarticus (Artiodactyla, Cervidae) in Piraí do Sul, Paraná, southern Brazil. 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 po… Show more
“…The mean group size values we observed for Los Ajos was 2.4, similar data were reported in other pampas deer populations (Redford, 1987;Merino & Beccaceci, 1999, Netto et al, 2000, Moore, 2001, Dellafiore et al, 2003, Pereira et al, 2005, Lacerda, 2008;Pérez Carusi et al, 2009;Braga & Kuniyoshi, 2010). The Typical Group Size (TGS) we observed at Los Ajos was 7.1 individuals, similar to the TGS (7.2 individuals) reported for the other Uruguayan population on Salto (Moore, 2001).…”
The most endangered subspecies of pampas deer Ozotoceros bezoarticus uruguayensis is an endemic cervidae of the Uruguayan temperate grasslands. The aim of our study was to assess the demographic trends, grouping structure and dynamic of this small and isolated population. We surveyed the population during seven years and detected an average of 117 (+ 72.7 SD) individuals (44 censuses). The average population structure observed was 55% adult females, 34% adult males, 10% juveniles, and 1% fawns, with a low recruitment rate of 0.11. The pampas deer is a gregarious cervidae with 62% of individuals being observed within groups of at least three animals. Nevertheless we observed substantial differences on group size and composition based on sex, reproductive status, season and trophic resources availability. The population dynamics showed significant changes around the year in the sexual aggregation-segregation pattern, corresponding with reproductive and physiological status. The mean density on this population (11 deer/ km2) is the highest reported for the species. Comparable data, from other populations, showed a significant correlation between density and sex ratio, with a reduction in the proportion of males with higher deer densities. An action plan for this endangered population should include initiatives involving private landowners, and guidelines to improve the deer habitat.
“…The mean group size values we observed for Los Ajos was 2.4, similar data were reported in other pampas deer populations (Redford, 1987;Merino & Beccaceci, 1999, Netto et al, 2000, Moore, 2001, Dellafiore et al, 2003, Pereira et al, 2005, Lacerda, 2008;Pérez Carusi et al, 2009;Braga & Kuniyoshi, 2010). The Typical Group Size (TGS) we observed at Los Ajos was 7.1 individuals, similar to the TGS (7.2 individuals) reported for the other Uruguayan population on Salto (Moore, 2001).…”
The most endangered subspecies of pampas deer Ozotoceros bezoarticus uruguayensis is an endemic cervidae of the Uruguayan temperate grasslands. The aim of our study was to assess the demographic trends, grouping structure and dynamic of this small and isolated population. We surveyed the population during seven years and detected an average of 117 (+ 72.7 SD) individuals (44 censuses). The average population structure observed was 55% adult females, 34% adult males, 10% juveniles, and 1% fawns, with a low recruitment rate of 0.11. The pampas deer is a gregarious cervidae with 62% of individuals being observed within groups of at least three animals. Nevertheless we observed substantial differences on group size and composition based on sex, reproductive status, season and trophic resources availability. The population dynamics showed significant changes around the year in the sexual aggregation-segregation pattern, corresponding with reproductive and physiological status. The mean density on this population (11 deer/ km2) is the highest reported for the species. Comparable data, from other populations, showed a significant correlation between density and sex ratio, with a reduction in the proportion of males with higher deer densities. An action plan for this endangered population should include initiatives involving private landowners, and guidelines to improve the deer habitat.
“…This apparent female-biased sex ratio can affect the demographic structure of a population by reducing the population's replacement rate (Souza-Mazurek et al, 2000). Since we do not have information on the population parameters of hunted populations in the study area, the possible impacts of selective hunting should be viewed with caution, as this species may have a higher proportion of females (Braga & Kunyioshi, 2010) to males (Rodrigues, 1996) in the population.…”
Community-based research that involves participatory monitoring has been increasingly used in studies on hunting activity in traditional societies of the Neotropics, particularly in the rainforest environment. We present the results from a year-long study of participatory monitoring of hunting in 10 villages in Xerente indigenous land in the Brazilian Cerrado, an initiative to build a sustainable-use program for local hunting. Fifty-two hunters recorded data on 390 hunts involving 451 kills and 5,878 kg of estimated biomass from 34 game species. Medium-and large-sized mammals were the most hunted species, while hunting activities were predominant in forest environments. Indigenous hunting techniques associated with collective hunts using fire are no longer used, and the use of traditional weapons such as the bow and arrow is now uncommon; firearms were the main weapon used. The data revealed current patterns of wildlife use as well as hunting activities. The implications of these results for future research on the management and conservation of wildlife hunting in Xerente indigenous land are presented. We present our findings to facilitate improved preparation of new monitoring programs in traditional societies that live in the Cerrado.
“…. Estudos preliminares realizados com material genético de uma pequena população remanescente no Paraná (Braga, 2004) apontaram a existência de haplótipos únicos nos marcadores mitocondriais utilizados, quando comparados ao banco representativo de populações do Brasil, Paraguai, Argentina e Uruguai. Este resultado evidencia a grande importância desta unidade genética para a conservação, e aponta a necessidade de estudos genéticos detalhados incluindo outras populações do sul do Brasil.…”
Ano da publicação: 07/06/2023Ozotoceros bezoarticus bezoarticus é uma subespécie que depende da boa qualidade das fitofisionomias abertas do Cerrado e Pampa e vem sofrendo declínio populacional acentuado. As principais ameaças a essa subespécie são a perda de habitat e a caça ilegal, mas também sofre impactos negativos causados por doenças, interações com espécies exóticas invasoras e domésticas, e degradação dos habitats dentro e fora de UCs. Em função da rápida e continuada supressão da vegetação do Cerrado, suspeita-se redução populacional de, ao menos, 30% nos últimos 15 anos (3 gerações) baseado em declínio na área de ocupação, extensão de ocorrência e/ou qualidade do habitat. Por essas razões, O. b. bezoarticus foi categorizada como Vulnerável (VU) pelo critério A2c.
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