Abstract
The point-count method is one of the most popular techniques for surveying birds. However, the accuracy and precision of this method may vary across various environments and geographical regions. We conducted sound-recorder-based point-counts to examine the accuracy and precision of the method for bird biodiversity estimation as a function of geographical region, habitat type and the time of day at which the survey began. In temperate (Poland) and tropical (Cameroon) regions, we recorded soundscapes on two successive mornings at 36 recording sites (18 in each location). At each site, we analyzed three 5-min surveys per day. We found no differences in the accuracy and precision of the method between regions and habitats. The accuracy was significantly greater at sunrise than during later surveys. The similarity of the bird assemblages detected by different surveys did not differ between regions or habitats. However, the bird communities described at the same time of day were significantly more similar to each other than those detected by surveys conducted at different times. The point-count method provided statistically indistinguishable estimates of bird biodiversity in different geographical regions and habitats. However, our results highlight two weaknesses of the method: low accuracy (41–54%), which limits the usefulness of a single survey in understanding bird–environment relationships, and changes in accuracy throughout the day, which may result in the misinterpretation of the status of bird populations.
Highlights
The point-count method is one of the most popular techniques for surveying birds, used for estimating abundance, density, species richness, distribution, and relations between birds and environment [1,2,3]
We focused on the accuracy and precision of the acoustic-recorder-based point-count method for estimating breeding bird species’ richness in forests and open habitats of tropical and temperate regions
We recorded an average of 10.0 ± 3.1 species at tropical sites and 7.0 ± 2.2 at temperate regions
Summary
The point-count method is one of the most popular techniques for surveying birds, used for estimating abundance, density, species richness, distribution, and relations between birds and environment [1,2,3]. This method does not provide real values but estimates of measured parameters [4,5]. Knowing the accuracy and precision of any applied variants of the method for surveying birds is important. By applying a given set of methodological assumptions (e.g., constant detection distance, time and duration of survey, observer skills, and weather conditions), different species are detected with different probabilities [8]
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