Relationship between Census Efforts and the Number of Species Encountered in Line Transect Censuses of Breeding Bird Populations in Woodland and Grassland Habitats of Eastern Hokkaido

摘要: Two 2-km line transects were deployed in Kushiro district, Hokkaido, Japan, one woodland and grassland. Censuses conducted 22 times along each route during the same breeding season. The relationship between census efforts number of species encountered was examined, suitable combinations for two-fold five-fold investigated. Furthermore, seasonal changes individual bird numbers major examined. Thirty-eight recorded both routes. In woodland, 14 considered to have established territories categorized as species; 24 other minor species. Nine 29 For routes, occurrence rates more than 40%, while most less 20%. To analyze encountered, I constructed all possible by using data compiled from visits. total increased with increasing Approximately 90% could be censuses 99% censuses. twice June or once May can provide including majority but do not allow discrimination Five-fold repeat these two categories rates. songbirds appeared differ among stages. investigate changes, season should divided into five periods, a performed period. This protocol will also confirm presence