SDE Feature Class
San Joaquin Valley, California, Grasslands Ecological Area, Central Valley, telemetry, Anas acuta., northern pintail, winter, environment
The purpose of this data set is to improve understanding of the ecology of northern pintails in California and serve as baseline data on which to measure impacts of changes in the Central Valley landscape on pintail ecology. DATA ASSUMPTIONS AND LIMITATIONS: All UTM coordinates for the points used in these data were generated using NAD27, Zone 10 datum although a number of points were in Zone 11. These data were converted to NAD83, Zone 10 datum and to Teale Albers projection for display on the BIOS site. Any error due to using Zone 10 datum instead of Zone 11 datum should be minimal considering the nature of the study. Positional accuracy of individual locations is limited by: uncertainty in telemetry locations (observer error) and possible data entry errors. Although all reasonable attempts have been made to limit these factors, positional accuracy for any individual point should not necessarily be considered minimal. The appropriateness of multiple scales of inference is the end-user's responsibility to justify and the originators assume no responsibility for incorrect or misleading uses of these data.
Using radio-telemetry, female northern pintail (Anas acuta) survival, distribution, and movements during late August-March in Central California were determined during 1991-92, 1992-93, and 1993-94. Accuracy of individual data fields has been reviewed. Data collection for 1991-94 is complete although additional years may be added. WHAT EACH RECORD REPRESENTS: Each record contains data about a duck's location, as well as information about the duck and hunting conditions at the time of observation.
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If the information is used, credit should be given to the US Geological Survey, Western Ecological Research Center, Dixon Field Station