Where ) 0(h denoted the slope of the probability density function of detection distances evaluated at zero distance. Thus density estimates were obtained from estimates of ) 0(h and encounter rate (n/K), ρ is referred to as the effective radius and corresponds to the radial distance from the point transect within which the number of undetected groups was equal to the number of groups detected beyond the circle with that radius. The circular area of detection out to the effective radial distance gives the effective area of detection ν.
Due to the different detection processes associated with visual (S)and acoustic(H)clues of birds, separate detection functions werefit to the datafor each condition. However, given that acoustic detections are unreliable in terms of distance and group size estimation, and can be problematic when it comes to correct species identification, the analysis in the current research was restricted to direct observations (visual detection, S)only.
Where ) 0(h denoted the slope of the probability density function of detection distances evaluated at zero distance. Thus density estimates were obtained from estimates of ) 0(h and encounter rate (n/K), ρ is referred to as the effective radius and corresponds to the radial distance from the point transect within which the number of undetected groups was equal to the number of groups detected beyond the circle with that radius. The circular area of detection out to the effective radial distance gives the effective area of detection ν.Due to the different detection processes associated with visual (S)and acoustic(H)clues of birds, separate detection functions werefit to the datafor each condition. However, given that acoustic detections are unreliable in terms of distance and group size estimation, and can be problematic when it comes to correct species identification, the analysis in the current research was restricted to direct observations (visual detection, S)only.
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