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Comparison of two methods for estimation of abundance of mountain vizcachas (Lagidium viscacia) based on direct counts Mastozool. neotrop.
Walker,R. Susan; Novaro,Andrés J.; Perovic,Pablo G..
Mountain vizcachas (genus Lagidium) are large, rock-dwelling rodents of the Andes and the Patagonian steppe. We tested the bounded count and double observer methods for estimating mountain vizcacha population size. Estimates obtained with these two count-based methods and a Lincoln-Petersen mark-resight estimate were similar. However, estimates obtained with the double observer method were the most precise, and the method is easy to use and practical. We recommend the use of the double observer method because it incorporates an estimate of detection probability that reduces bias and allows comparisons between sites and across time.
Tipo: Info:eu-repo/semantics/report Palavras-chave: Bounded counts; Detection probability; Double observer; Mark-resight; Population estimation.
Ano: 2008 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-93832008000100014
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Buffer zone use by mammals in a Cerrado protected area Biota Neotropica
Paolino,Roberta Montanheiro; Versiani,Natalia Fraguas; Pasqualotto,Nielson; Rodrigues,Thiago Ferreira; Krepschi,Victor Gasperotto; Chiarello,Adriano Garcia.
Habitat loss and degradation is threatening mammals worldwide. Therefore, Protected Areas (PA) are of utmost importance to preserve biodiversity. Their effectiveness, however, depends on some management strategies such as buffer zones, which prevent/mitigate the impact of external threats and might increase the amount of available habitat for wildlife existing within reserves. Nevertheless, how intensively terrestrial mammals use buffer zones remains little studied, particularly in the Neotropical region. Aiming to analyse the use of a buffer zone (5 km wide) by medium and large-sized mammals, we modelled the occupancy probabilities of five species of conservation concern including local (interior and buffer zone) as a site covariate, simultaneously...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Medium and large-sized mammals; Camera trapping; Detection probability; Occupancy; Jataí Ecological Station.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032016000200205
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Influence of camera-trap sampling design on mammal species capture rates and community structures in southeastern Brazil Biota Neotropica
Srbek-Araujo,Ana Carolina; Chiarello,Adriano Garcia.
The distribution of species and population attributes are critical data for biodiversity conservation. As a tool for obtaining such data, camera traps have become increasingly common throughout the world. However, there are disagreements on how camera-trap records should be used due to imperfect species detectability and limitations regarding the use of capture rates as surrogates for abundance. We evaluated variations in the capture rates and community structures of mammals in camera-trap surveys using four different sampling designs. The camera traps were installed on internal roads (in the first and fourth years of the study), at 100-200 m from roads (internal edges; second year) and at 500 m from the nearest internal road (forest interior; third year)....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Atlantic Forest; Capture success; Detection bias; Detection probability; Mammal inventory.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032013000200051
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