Literaturdatenbank
Literaturdatenbank |
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Bider, J. R., & Hoek, W. (1971). An efficient and apparently unbiased sampling technique for population studies of painted turtles. Herpetologica, 27(4), 481–484.
Added by: Sarina Wunderlich (30 Oct 2011 14:52:31 UTC) |
| Resource type: Journal Article BibTeX citation key: Bider1971 View all bibliographic details  |
Categories: General Keywords: Chrysemys, Chrysemys picta, Emydidae, Habitat = habitat, Nordamerika = North America, Schildkröten = turtles + tortoises Creators: Bider, Hoek Collection: Herpetologica |
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| Abstract |
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Chrysemys picta muddling Hand sampling of turtle populations is usually considered a biased technique, worst of which, it favors the capture of juveniles. Collecting during spring emergence favors the capture of large turtles. In the fifth year of a population study, a floating blind was used to camouflage collectors, and many biases seemed to be reduced if not eliminated. The sex ratio changed slightly, but justifiably, toward a larger proportion of females. The percentage of animals recaptured from the previous year increased from 47% to 78%. The proportion of juveniles in the sample decreased from the reported biased figure of 50% to 25%. It was estimated that 60% of the turtles in the 1-acre pond were caught in 16 man-hours. The apparatus and technique are described.
Added by: Sarina Wunderlich |