Download Site for North American Raptor δDf Map and Sample Data


The files available for download below relate to the following publication:

 

Lott, C. A., and J. P. Smith. 2006. A geographic-information-system approach to estimating the origin of migratory raptors in North America using stable hydrogen isotope ratios in feathers. Auk 123:822-835.

 

Reference Feather Samples Source Data (MS Excel file)

JPEG Image of North American Raptor δDf Map (file size 464 Kb)

North American Raptor δDf Map GIS package (25.3 MB zipped file set)

 

 

Instructions for downloading and installing the map of North American raptor δDf on your own computer.

 

This map of hydrogen stable isotope ratios in North American raptor feathers is compatible with Arcview 3.x and ArcGIS 9.x. However, it requires that you are also running the Spatial Analyst extension with either of these programs. This map will not work without Spatial Analyst.

 

Step 1: From the link above, download the entire “HWI_website_feather_map.zip” folder to the desired location on your hard drive.  We recommend placing it as a subfolder in the ESRI directory.

 

Step 2: Unzip the folder.

 

Step 3: Open ArcView or ArcMap and make sure that the Spatial Analyst extension is running.

 

Step 4: For ArcView 3.x users: click the “Add Theme” button.  Make sure that the drop down menu in the bottom left corner is set to "Grid Data Source."  If this option is not available, make sure that the Spatial Analyst extension is active by going to File--Extensions and clicking on the check box for Spatial Analyst. For ArcGIS 9.x users: Use the “Add theme” button to add the layer called “calc3”.

 

You should now have a working version of the feather map.  If you have any trouble getting this to work, feel free to email Casey Lott at clott@abcbirds.org for assistance.

Bonus: for ArcView 3.x users, two useful legends are included in the “final_feather_map” folder.  The “ddf_legend.avl” file is the same legend used in the .jpg image above (or Figure 4 in the Auk paper).  In this legend, the map is broken up into 10 per mil bands.  The “migrant_legend.avl” file is the same legend we used for Figure 5 in the Auk paper.  In this legend, the map is broken up into 1 per mil bands.  If you are displaying the origins of your migrants on the map using some kind of relative abundance color scheme like we did in our paper you can just double click on each δDf value and assign it a new color.  You can copy and paste this layer over and over into the same project to create new maps for different species/site combinations.