An analysis of monthly home range size in the critically endangered California Condor Gymnogyps californianus Public Deposited

http://ir.library.oregonstate.edu/concern/articles/xs55md700

To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. This is the publisher’s final pdf. The article is copyrighted by BirdLife International and published by Cambridge University Press. It can be found at:  http://journals.cambridge.org/action/displayJournal?jid=BCI.

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  • Condors and vultures comprise the only group of terrestrial vertebrates in the world that are obligate scavengers, and these species move widely to locate ephemeral, unpredictable, and patchily-distributed food resources. In this study, we used high-resolution GPS location data to quantify monthly home range size of the critically endangered California Condor Gymnogyps californianus throughout the annual cycle in California. We assessed whether individual-level characteristics (age, sex and breeding status) and factors related to endangered species recovery program efforts (rearing method, release site) were linked to variation in monthly home range size. We found that monthly home range size varied across the annual cycle, with the largest monthly home ranges observed during late summer and early fall (July-October), a pattern that may be linked to seasonal changes in thermals that facilitate movement. Monthly home ranges of adults were significantly larger than those of immatures, but males and females used monthly home ranges of similar size throughout the year and breeding adults did not differ from non-breeding adults in their average monthly home range size. Individuals from each of three release sites differed significantly in the size of their monthly home ranges, and no differences in monthly home range size were detected between condors reared under captive conditions relative to those reared in the wild. Our study provides an important foundation for understanding the movement ecology of the California Condor and it highlights the importance of seasonal variation in space use for effective conservation planning for this critically endangered species.
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  • Rivers, J. W., Johnson, J. M., Haig, S. M., Schwarz, C. J., Burnett, L. J., Brandt, J., ... & Grantham, J. (2014). An analysis of monthly home range size in the critically endangered California Condor Gymnogyps californianus. Bird Conservation International, 24(4), 492-504. doi:10.1017/S0959270913000592
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  • description.provenance : Made available in DSpace on 2014-12-29T17:22:34Z (GMT). No. of bitstreams: 1 RiversJamesForestryAnalysisMonthlyHome.pdf: 543850 bytes, checksum: baaa96f403131e4352ea640c177ed635 (MD5) Previous issue date: 2014-12
  • description.provenance : Approved for entry into archive by Erin Clark(erin.clark@oregonstate.edu) on 2014-12-29T17:22:34Z (GMT) No. of bitstreams: 1 RiversJamesForestryAnalysisMonthlyHome.pdf: 543850 bytes, checksum: baaa96f403131e4352ea640c177ed635 (MD5)
  • description.provenance : Submitted by Erin Clark (erin.clark@oregonstate.edu) on 2014-12-29T17:22:17Z No. of bitstreams: 1 RiversJamesForestryAnalysisMonthlyHome.pdf: 543850 bytes, checksum: baaa96f403131e4352ea640c177ed635 (MD5)

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