Browsing by Author "Sanhueza, Doris"

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    Conflict between wild carnivores and livestock raisers in Central Chile
    (2009) Guarda, Nicolás; Ibarra Eliessetch, José Tomás; Sanhueza, Doris; Amar, Francisca; Bonacic Salas, Cristián
    Conflict between people and wild carnivores is one of the most urgent issues worldwide. This conflict impacts on humans (with economic losses), as well as wildlife (carnivore persecution and hunting) and ecosystems (carnivores are necessary to maintain functional equilibriums). In Chile, this conflict is evidenced in the high number of complaints received by the Chilean Agriculture and Livestock Service (SAG), mainly of attacks by puma (Puma concolor) and Foxes (Lycalopex griseus and L. culpaeus). Our study consisted in an assessment of this conflict in six rural places in the Mediterranean ecosystem of central Chile (29º50’S - 34º15’S). We applied questionnaires (N=60) in order to evaluate the conflict perception by farmers. We also studied the diet of the carnivore assemblage, using taxonomic keys to identify undigested remains in 102 scats collected opportunistically in the same localities. We inquired about livestock type, management practices and predation history. Mean livestock herd size was 84 individuals per household, including goats, sheep, cattle and horses, either adult or young. Management and husbandry practices were scarce, with almost no sanitary or reproductive care and herds were free ranging in hills and Andean valleys most of the year. Every surveyed household declared livestock losses to predation, mainly by Puma (28,1%), Foxes (27,4%), Feral dogs (17,1%), Andean condor (16,4%) and other species (11%) and 97,4% of respondents declared that carnivores affected them. Diet analyses of dogs (N=7) presented the highest livestock consumption (40%), followed by Foxes (N=27; 13,04%), Puma (N=27; 9,68%) and small Wild Cats (N=41; 6,9%). All of the species studied showed a high consumption of European hare (Lepus capensis). Nevertheless, Puma (80,85%) showed the greatest consumption of this exotic species, followed by Foxes (36,96%), small Wild cats (41,38%) and Dogs (30%). We conclude that indeed there’s a strong conflict between wild carnivores and farmers, but low livestock presence in diet and other expected mortality causes lead us to speculate that its real magnitude might be overestimated. Further studies with bigger sample sizes, more refined methodology and in situ verification are needed to get a more accurate measurement of both perceived and real conflict. This study, though limited, still provides a usefull initial approach to the issue.
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    Species richness, diversity and human activities in an elevation gradient of a high-ecosystem in Lagunas Huascoaltinas, Atacama Region, Chile
    (2009) Sanhueza, Doris; Miranda, Marcelo; Gomez, Miguel; Bonacic, Cristian
    D. Sanhueza, M. Miranda, M. Gomez, and C. Bonacic. 2009. Species richness, diversity and human activities in an elevation gradient, a high-ecosystem, Lagunas Huascoaltinas, Atacama Region, Chile. Cien. Inv. Agr. 36(3):411-424. The relationship between species richness, diversity and grazing frequency along an altitudinal gradient (1900-3400 m) of an Andean ecosystem indicates that there is an intense human pressure on vegetation use. To identify the vascular flora and its conservation, 20 sites were sampled in two visits during 2006. We identified 79 taxa, including 62.03% native species, 22.78% adventitious and 8.86% endemic (the remaining 6.33% was identified only at the genus level). Some genera were underrepresented. We also observed latitudinal limits (Alstremeria andina), monotypic genera (Geoffroea, Kurzamra, Phragmiles, Tessaria and Salix) and monogeneric families (Buddlejaceae, Ephedraceae, Equisetaceae, Malesherbiaceae, Salicaceae and Oxalidaceae). Moreover, we found differences in the species distribution patterns during periods of grazing use and identified statistically significant differences in the species richness (p < 0.001), diversity (p = 0.010) and grazing frequency (p = 0.047).
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