|
Counting gibbons: The evolution of sample methods |
|---|---|
| รหัสดีโอไอ | |
| Creator | Warren Y. Brockelman |
| Title | Counting gibbons: The evolution of sample methods |
| Publisher | Nakhon Pathom Rajabhat University |
| Publication Year | 2562 |
| Journal Title | Interdisciplinary Research Review |
| Journal Vol. | 14 |
| Journal No. | 6 |
| Page no. | 21 |
| Keyword | Auditory survey, census methods, gibbons, population sampling, wildlife survey |
| URL Website | http://dept.npru.ac.th |
| Website title | สถาบันวิจัยและพัฒนา มหาวิทยาลัยราชภัฏนครปฐม |
| ISSN | 2697-522X |
| Abstract | Estimating the population sizes of endangered species in the natural environment is a major activity of conservationists. Di erenttypes of animals require di erent methods of population census and sampling. Statistical standards of sampling populationshave increased and new analytical software has reduced the time needed for manual computation, but increased the need forstandardized data collection methods. Here I discuss the methodology used in gibbon population sampling and current discussionsregarding the best method of data analysis. Gibbons are most e ciently sampled by listening for their duetted songsgiven by mated reproductive pairs in small territorial groups. Several problems have to be overcome in field data collection andanalysis: the decline in sound detection with distance, the possibility of groups singing more than once in a day, the probabilityof a group singing (or not singing) on a given day, and determination of the total area that the audible groups are occupying.The traditional way of dealing with these problems is by triangulating on singing groups from several simultaneous listeningposts, and carefully mapping the locations of groups. There are biases present in most methods and ways overcoming biasusing newer methods are discussed. Survey of gibbons and other animals is a constantly evolving process, and there is still nouniversally accepted methodology. |
