Advantages and disadvantages
Point counts are widely used to census songbirds. Line and point transects are compared with each other in Table 9.2. Point counts have been used, for example, to census waders, waterfowl and nocturnal birds in Finland (Koskimes & V¨ais¨anen 1991), parrots and hornbills in Indonesia (Marsden 1999) and the endemic bullfinch on the Azores (Bibby et al. 2000). Because most birds are detected by song or call, a high level of observing experience is required of observers. Counting stations are relatively easy to allocate randomly, which is not always the case for territory-mapping plots or line transects. Recording time is lost in moving between counting stations. Point counts are more suitable than transects where habitat is patchy, though much less so in open habitats where birds are likely to flee from the observer. Point counts are unsuitable for species that are easily disturbed or those that respond strongly to the presence of an observer. They are, however, very efficient for gathering large amounts of data quickly. Point counts can be used outside the breeding season.
Advantages and disadvantages
Point counts are widely used to census songbirds. Line and point transects are compared with each other in Table 9.2. Point counts have been used, for example, to census waders, waterfowl and nocturnal birds in Finland (Koskimes & V¨ais¨anen 1991), parrots and hornbills in Indonesia (Marsden 1999) and the endemic bullfinch on the Azores (Bibby et al. 2000). Because most birds are detected by song or call, a high level of observing experience is required of observers. Counting stations are relatively easy to allocate randomly, which is not always the case for territory-mapping plots or line transects. Recording time is lost in moving between counting stations. Point counts are more suitable than transects where habitat is patchy, though much less so in open habitats where birds are likely to flee from the observer. Point counts are unsuitable for species that are easily disturbed or those that respond strongly to the presence of an observer. They are, however, very efficient for gathering large amounts of data quickly. Point counts can be used outside the breeding season.
การแปล กรุณารอสักครู่..
