Sandhill Cranes Satellite Telemetry Points

Jun 3, 2013
Uploaded by William Perry
The objective of our study was to compare winter movement patterns of sympatric greater and lesser sandhill cranes (Grus canadensis tabida and G. c. canadensis) wintering in the Sacramento-San Joaquin Delta region of California (Delta). We marked 31 greaters and 45 lessers with VHF radios and recorded their roosting and feeding locations throughout the wintering periods in 2007/08 and 2008/09. Ten of the lessers were also marked with platform terminal transmitters and tracked via the Argos Satellite System. Compared to lessers, locations of greaters were much more predictable. Greaters showed strong fidelity to wintering sites and moved between discrete wintering areas less frequently. During the second year of our study, 90% of the greaters returned to the study area, compared to 69% of the lessers. Only two greaters (7%) were located in more than one discrete wintering area, compared to 40% of the lessers. Average flight distances from night roost sites to feeding areas were lower for greaters than for lessers and consequently, winter home range sizes were smaller for greaters. These results have application for conservation of wintering cranes at a landscape scale and indicate that habitat protection and mitigation for the state-threatened greater sandhill crane must occur very close to existing use areas to be successful.
Data Provided By:
Mike Casazza, US Geological Survey, Western Ecological Research Center
Content date:
2006, 2010
Contact Organization:
USGS BRD Western Ecological Research Center
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About the Uploader

William Perry
IT/GIS Specialist with US Geological Survey

I am a GIS specialist with the US Geological Survey. My background is in wildlife biology, computer science and GIS. I work with our research biologists to answer questions about various species and their habitats.