RESUMO: Em diversas partes da América Latina, a perda e diminuição do habitat natural de animais silvestres ocorre em função do aumento das atividades agropecuárias. Nos últimos anos o número de mortes de animais de criação por depredação tem aumentado, bem como a consequente retaliação aos predadores. Como resultado destas ações, ocorre à extinção ou redução das populações destes predadores de topo, provocando perdas ecológicas. Esse estudo teve como objetivo apontar medidas preventivas e mitigatórias da depredação de ovinos por onça-parda (Puma concolor). Através da análise de dois estudos de casos de depredação no Centro-Oeste brasileiro e na região dos Andes Colombianos, levantamos soluções alternativas sustentáveis para que profissionais e criadores possam se prevenir desta ameaça ao rebanho ovino. Um estudo de caso foi realizado em fazenda no município de Alto Paraguai, Mato Grosso. Entre os anos 2005 e 2014 houve visitas na propriedade para diagnóstico de doenças e realizou-se estudo comparativo da quantidade de mortes por doenças com as mortes por depredação. No ano de 2010 ocorreu um ataque depredatório que resultou em morte de seis ovinos. Em 2014, realizou-se um estudo na região central do Departamento del Valle del Cauca, há 2814m de altitude nos Andes colombianos, para diagnosticar a depredação de gado na região e implementar medidas para prevenir sua ocorrência e avaliar sua eficácia. No total, foram implementadas medidas anti-depredação sobre oito propriedades, e entre elas, um curral com cerca elétrica para ovelhas foi implementada em uma fazenda no município de Tuluá. Os resultados mostram que as perdas econômicas por depredação são graves nas duas regiões estudadas e se equiparam a perdas por doenças no estudo de caso em Mato Grosso, Brasil. Portanto recomenda-se a combinação entre o manejo sanitário, métodos de prevenção e, se necessário, mitigação de ataques depredatório. Além disso, legisladores devem se associar a pesquisadores para traçar estratégias efetivas para esse sério problema na América Latina.

ABSTRACT: In several parts of Latin America, the expansion of agriculture over the years has caused loss and reduction of wild fauna natural habitat. Recently, deaths of sheep and cattle have increased due to predation by large carnivores and the resulting retaliation by farmers on predators. Consequently, populations of these top predators have been reduced or have got even locally extinct, leading to imbalances on ecosystems, altered because of the carnivore effects on prey dinamics. The objective of this study is to analyse sheep depredation by puma (Puma concolor), in Central Brazil and in the Colombian Andes and point out preventive and mitigating measures that can be implemented in rural areas. From 2005 to 2014, we visited a ranch in Alto Paraguai, Mato Grosso, Brazil for diagnostic purposes and we compared the death of sheep from diseases and depredation attacks. In 2014, we visited a rural area in the central region of Departamento del Valle del Cauca, at 2814m of altitude in the Colombian Andes, to diagnose sheep predation, implement preventive measures, and evaluate their effectiveness. The results reveal that economic losses due to predation are critical on both studied regions and similar to losses by diseases in Mato Grosso state, Brazil. Thus, we recommend the integration of health management, preventive measures as well as mitigation of depredatory attacks at the local scale and we discuss potential sustainable measures that can be locally implemented by farmers. Furthermore, we recommend that public policies should incorporate scientific results on human-wildlife conflicts to be effective, considering both livestock management and biodiversity conservation.

ABSTRACT The Pantanal is the largest inland wetland in the world and is under increasing anthropogenic threats, including long-term regionally intensive gold mining practices. Gold mining activities are known to cause the release of harmful pollutants such as mercury (Hg) to the surrounding environment. Jaguars (Panthera onca (Linnaeus, 1758)) are apex predators, and therefore show great potential to accumulate Hg by biomagnification. We hypothesize that total Hg content in the fur of jaguars from two sites within the Brazilian Pantanal would be significantly different as a function of distance from active gold mining operations. The Hg content was determined by fluorescence spectrometry. The mean ± SD Hg content in jaguars from the study site influenced by gold mining (SB) was compared to jaguars sampled in the area free of gold mining activities (CA) using a one-way ANOVA. The mean Hg content in jaguars from SB (673.0 ± 916.8 µg g-1) is significantly different from jaguars sampled in CA (29.7 ± 23.3 µg g-1), p = 0.03. The maximum recorded content of Hg was 2,010.4 ± 150.5 µg g-1, highest level ever recorded in a wild animal. The data indicate that Hg is an important threat to jaguars within at-risk regions of the Pantanal.

We investigated the density and activity of the oncilla, Leopardus tigrinus (Schreber, 1775), a threatened small cat, in the Brazilian Atlantic Forest, using camera-trap data. We described differences in the activity of individuals occurring alone or in sympatry with larger cats. Oncilla presented low densities (7-13 ind./100 km²) and high flexibility in its activity. The oncillas were primarily nocturnal in the absence of other larger cat species - margay, ocelot and puma - but became more diurnal, with a cathemeral activity pattern, when the other cats were present. Oncilla is likely to be in a subordinate position in interactions with larger cats and changes its activity to decrease the chances for interspecific encounters. In this study, however, the presence of other cat species covaries with habitat changes (from coastal forest patches to dense evergreen forests). We also verified the highest oncilla relative abundance in an area with no sympatric larger cats, with abundance decreasing when it was in sympatry with margay, ocelot and puma. Our results, together with recent records of oncilla in other degraded landscapes of the Atlantic Forest of Brazil, provide evidence that oncillas may thrive even in harsh environments where other cats have already been extinct. This raise interesting conservation insights, as in the absence of other cats, L. tigrinus may assume a top predator role of these impoverished vertebrate communities.