Getting started

Quick start

1) Download your data from the USGS Bird Point Count Database.

2) Press the "Load data" button, select the desired database, and click okay.

3) Select the species and point groupings you want to analyze and click analyze. Use the "Add group" button to compare different point groupings.

4) You can now view results in the program, export to Excel, and graph results.

Detailed instructions

1) Download your data in Microsoft Access format from the USGS Point Count Database.

2) Press the "Load data" button, select the desired database, and click okay. After loading, the program will display all species detected and the name and year of available point groupings. If there are no groupings defined, the program will display the day, year, and time of all surveys in the database. The program will truncate the data set at the last finite distance radius (e.g., 100m) and remove flyovers.

3) Select the species and point groupings (or points) you wish to analyze and click analyze. To assign sites to up to three different groups, use the add group button. To view points instead of the point groupings that were defined in the point count database, uncheck the "View point groupings" box.

4) While models are analyzed in program MARK you will see a number of black command line windows appear and disappear. When there is not enough data to estimate abundance for some species the program will adaptively remove those species from analysis and try again. This process usually takes a few different attempts. When the analysis is complete, the program will display results in the results viewer. Click on the column headings to sort results by column. The display window does not show all the metrics estimated by the program. To save this output and additional information on detectability, click the "Save detailed results in Excel" button.

5) In the output file, there are three sheets (tabs at the bottom). The first sheet reports calculations of detections, abundance (birds/pt), with 90% and 95% upper and lower confidence limits; this information was displayed in the output window. The second sheet reports detection probabilities by group and species, with 90% and 95% upper and lower confidence limits; this information was not displayed in the output window. The final sheet includes the results from the community analysis.
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