| Abstract: | Most of the surveys presently used to estimate population trends on a large geographic scale depend upon repeated visits to a number of randomly selected routes or monitoring points. As these surveys cannot be analyzed by modeling annual mean densities among routes within a region, no natural annual index of population density exists for the region. We discuss two possible methodologies for estimating annual indices of abundance. In the context of the route-regression methodology, in which trends are estimated for each route and regional population trends are estimated as weighted averages of route trends, it is possible to find average residual distances between the predicted trends on each route and the actual data points. Adding these average residuals to the regional predicted values provides a measure of average distance from the actual data points to the predicted trends. A linear model approach can also be used to estimate annual indices, in which a regional slope parameter can be fit to the data in combination with annual effects. Bootstrapping can be used to provide some measure of the variability of these annual effects. These methods provide similar results in an example using Breeding Bird Survey data for scissor-tailed flycatcher (Tyrannlls forficatus) trends in Arkansas and Oklahoma. |
| Genre: | Federal Government Series |
| ProdID: | 5210599 |
| Citation Author: | Sauer, J.R.; Geissler, P.H. |
| Citation Contributing Office: | Patuxent Wildlife Research Center |
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| Citation Editor: | Sauer, J.R.; Droege, S. (editors) |
| Citation End Page: | 62 |
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| Citation Language: | English |
| Citation Larger Work Title: | Survey Designs and Statistical Methods for the Estimation of Avian Population Trends |
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| Citation Phsyical Description: | v, 166 |
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| Citation Public Comments: | PDF on file: see 3990_Sauer.pdf 9.5 MB |
| Citation Publisher: | U.S. Fish and Wildlife Service |
| Citation Series: | Biological Report |
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| Citation Search Results Text: | Estimation of annual indices from roadside surveys; 1990; Federal Government Series; Survey Designs and Statistical Methods for the Estimation of Avian Population Trends; Sauer, J.R.; Geissler, P.H. |
| Citation Start Page: | 58 |
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| Citation Year: | 1990 |
| Type: | citation/reference |
| Text: | Estimation of annual indices from roadside surveys; 1990; Federal Government Series; Survey Designs and Statistical Methods for the Estimation of Avian Population Trends; Sauer, J.R.; Geissler, P.H. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Tue, 9 Jun 2009 09:23 -0500 |
| Publisher: | U.S. Fish and Wildlife Service |
