992 resultados para field efficiency
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v.71(1979)
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v.30:pt.1:no.1(1940)
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no.28(1929)
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12, no. 1
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12, no. 3
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v.16(1923)
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n.s. no.36(2003)
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v.7:no.4(1912)
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no.4(1922)
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v.37:no.4(1977)
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v.21:no.3(1935)
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v.32(1973)
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v. 42 (1971)
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v. 41 (1970)
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In order to evaluate the efficiency of different mammalian survey methods, we compared traditional sampling techniques (use of camera-traps on roads and artificial trails, track censuses, and direct field visualization) with an alternative sampling design (camera-traps positioned in natural areas such as natural trails and shelters). We conducted the study in a deciduous Atlantic-Forest park in southern Brazil, and additionally compared our results with a previous intensive study carried out in the same area. Our considerably smaller sampling effort (example: 336 trap.day for our camera-traps versus 2,154 trap.day for the earlier study) registered the presence of 85% of the local known species, with camera-traps being 68% efficient. Moreover, shelter camera-traps revealed a different species composition regarding most of other sampling methods. This sampling strategy involving natural forest sites was therefore able to effectively optimize the chances of evaluating species composition in a shorter period, especially with respect to lower-density and cryptic species, as well as to detect species that avoid open, disturbed sites such as roads and man-made forest trails.