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Applying Hot Spot Analysis to Carnivore GPS-telemetry Data and Camera Images to Examine Wildlife Connectivity across Highways in Southern California

Released: 2011
Lyren, L.M.,  R S. Alonso, W.M. Perry, R.V. Lugo, K.R. Crooks, and E.E. Boydston 2011.  Applying Hot Spot Analysis to Carnivore GPS-telemetry Data and Camera Images to Examine Wildlife Connectivity across Highways in Southern California. ESRI International Users Conference. San Diego, Ca July 11-15 2011.

We evaluated wildlife movement and assessed relative importance of undercrossings to landscape connectivity in an area fragmented by highways and other development and where the State of California made significant investments to wildlife connectivity.  To assess road permeability, we monitored 65 undercrossings along 20 km of state highways at the intersection of Orange, Riverside, and San Bernardino counties using remotely-triggered cameras to detect carnivores and GPS-tracking carnivores captured nearby.  During 2008-2010, we GPS-collared and tracked 15 coyotes and 17 bobcats for an average of four months per individual.  We retrieved collars and successfully downloaded GPS data for 11 coyote and 15 bobcat collars, and found that 10 coyotes and 8 bobcats crossed highways a total of 669 times during GPS data collection.  Similarly, remotely-triggered cameras monitored the underpasses for about 15 months and detected bobcats and coyotes using the undercrossings 4,061 times. To allow for objective comparisons between monitoring methods, landscape scales, and carnivore species, we used the Getis-Ord Hot Spot tool to examine their underpass crossing activity. We augmented the analysis by conducting mortality surveys for animals struck by vehicles to identify unsafe crossing areas along the roads by synthesizing data from 2008-2010 and 1997-2000.

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ESRI_Conf_2011_Caltrans Project Wildlife Connectivity final.pdf234,837 Bytes

This product is associated with the following project:
Impacts of Human Activity and Development on Behavior, Genetics, Disease and Mortality on Bobcats and other Carnivores

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