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My name is William Perry. I'm a GIS specialist with the Western
Ecological Research Center of the U.S. Geological Survey. Alongside me is
Robert Lugo who is also a GIS specialist with USGS, and we're going to
show you today an animation we did in Google Earth which shows the
movement path of a GPS-collared male bobcat that crossed California
Highway 71 three times during a 24-hour period. This was for a project
that was funded via Caltrans. Two of our scientists worked on that Erin
Boydston and Lisa Lyren. We took that information and created this
animation to show you visually how the bobcat is using the landscape and
the highway under-crossings.
So I'll start the animation. You can see here the point locations on the
map. Yellow represents daytime locations, blue represents the nighttime
locations. We've already flown over the highway -- you can see the time-
stamp. The GPS collars would take a point approximately every 15 minutes.
And the paired white symbols on each side of the highway represent the
actual culvert or under-crossings as we call them.
So you can as the bobcat made its way through the landscape, he criss-
crossed over the highway three different times. And now you can see we're
now actually going past midnight and going into the next calendar day.
And we end up on the east side of California Highway 71 in an area called
Prado Basin, which is heavily forested.
So this map here shows the cumulative data points for that same bobcat we
saw in the Google Earth animation. You'll see the small dark points are
the GPS locations and the red lines that connect those. The highlighted
route in cyan is the one we saw in the animation.
In addition to this, we have data for 14 additional bobcats and for 11
coyotes, and this helps to give us an idea of how these carnivores use
the landscape in this urban environment.
Title: Bobcat Movement Patterns in Urban Southern California
USGS biologists are using GPS technology to track carnivores as they cross the highways of urban Southern California. USGS Western Ecological Research Center biologists Erin Boydston and Lisa Lyren attached GPS tracking collars to wild bobcats to shed light on how these carnivores are using highway under-crossings to travel between habitats, and whether urban development in Los Angeles and Orange County landscapes is shifting wildlife behavior. GIS specialist Bill Perry explains in this Google Earth animation.
Location: Los Angeles, CA, Hwy 71, USA
Date Taken: 7/11/2011
Video Producer: Ben Young Landis , USGS Western Ecological Research Center
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Additional Video Credits:
Ben Young Landis, William Perry, Lisa Lyren, Erin Boydston
For more information see: Santa Monica Mountains Field Station
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