Modified Petraborg index applied to the sampling of male crickets by aural detection
Journal of Orthoptera Research(2009)
摘要
Abstract A modified Petraborg index is proposed to correct an underestimation error in the original formula and its use illustrated in censusing singers of Oecanthus niveus in Mexico. The unmodified index departs widely from observed densities; the modified index does not.
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关键词
indexation
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