Original Research

Power and precision of replicated helicopter surveys in mixed bushveld

B.K. Reilly, R.H. Emslie
Koedoe | Vol 41, No 1 | a245 | DOI: https://doi.org/10.4102/koedoe.v41i1.245 | © 1998 B.K. Reilly, R.H. Emslie | This work is licensed under CC Attribution 4.0
Submitted: 31 July 1998 | Published: 31 July 1998

About the author(s)

B.K. Reilly, University of, South Africa
R.H. Emslie,, South Africa

Full Text:



It is well known that aerial game counts in South Africa are often applied in a non-standardised, unreplicated fashion. They contribute to poor management decisions based on their results as they may be subject to large statistical Type I and II errors. Replicate counts of large herbivores were conducted in a 8 500 ha sample site in the Loskop Dam Nature Reserve in July 1991. These data were used to estimate precision of the counts and estimate statistical power to detect population changes for different combinations of replications and significance levels.


Game counting, helicopter counts, precision, statistical power.


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Crossref Citations

1. Statistical power of replicated helicopter surveys in southern African conservation areas
Brian K. Reilly, Hubertus J. van Hensbergen, Riette J. Eiselen, Peter J. S. Fleming
African Journal of Ecology  vol: 55  issue: 2  first page: 198  year: 2017  
doi: 10.1111/aje.12341