Raptor Population Index Project: 2013 Analysis

Cite these pages as:
    Crewe, T., P. Taylor, D. Lepage, L. Goodrich, J. Brown, and J. Sodergren. The Raptor Population Index, 2013 Analysis Methods and Trend Results. Available at http://rpi-project.org/2013/

    Brandes, D., D. Oleyar, S. Hoffman, and L. Goodrich. The Raptor Population Index, 2013 Regional Trend Summaries and Conservation Assessments. Available at http://rpi-project.org/2013/assessments2013.php

The 2013 RPI analysis effort includes a new set of population trend analyses containing information on 22 species of diurnal raptors, grouped into four regions (East, Central, West, and Gulf). This analysis forms the foundation of a new assessment of the status of migratory birds of prey in North America. Over 50 datasets were used, each consisting of 10 to 45 years of counts contributed by migration monitoring sites to HawkCount.org.

To view the 2013 RPI Analysis results, use the menu to the left, or click one of the following:

  • Trend Graphs: View trend graphs by site and by species
  • Trend Maps: View trends by species on maps of North America
  • Methodology: How to read the graphs and maps and a short description of the methods used to calculate the population indices and trends
  • Assessments: Regional population assessments by species