Document Type
Article
Publication Title
Monitoring bird populations by point counts. Gen. Tech. Rep. PSW-GTR-149.
Publisher
Department of Agriculture, Forest Service, Pacific Southwest Research Station
Publication Date
1995
Volume
PSW-GTR-149
Disciplines
Biology | Life Sciences
Abstract
We conducted a series of 275 paired (on- and off-road) point counts within 4 distinct vegetation cover types in northwestern Montana. Roadside counts generated a bird list that was essentially the same as the list generated from off-road counts within the same vegetation cover type. Species that were restricted to either on- or off-road counts were rare, suggesting that restricted occurrences were a consequence of small sample sizes and not a product of habitat differences surrounding on-versus off-road points. Nevertheless, there were significant differences in the mean number of individuals detected between on- and off-road points for a number of species. Some of these differences appear to be a product of habitat changes associated with the presence of roads, and those differences appear to be less pronounced on narrower roads. Therefore, we recommend that, if one wishes to extrapolate results from on- to off-road areas, care should be taken to select smaller, secondary or tertiary roads as transect routes.
Rights
This article is in the public domain.
Recommended Citation
Hutto, Richard L.; Hejl, Sallie J.; Kelly, Jeffrey F.; Pletschet, Sandra M. 1995. A Comparison of Bird Detection Rates Derived from On-Road vs. Off-Road Point Counts in Northern Montana. In: Ralph, C. John; Sauer, John R.; Droege, Sam, technical editors. 1995. Monitoring bird populations by point counts. Gen. Tech. Rep. PSW-GTR-149. Albany, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Research Station: p. 103-110