Papers by Kathleen Longshore
Journal of Mammalogy, 2016
Western North American Naturalist, 2015
Wildlife Society Bulletin, 2013
Western North American Naturalist, 2013
Journal of Wildlife Management, 2007
Journal of Raptor Research, 2010
... Population estimates are relatively well known for many habitats (eg, grasslands, Desmond and... more ... Population estimates are relatively well known for many habitats (eg, grasslands, Desmond and Savidge 1996; agricultural areas, Rosenberg and Haley 2004; and urban environments, Trulio 1997), but little is known about Western Burrowing Owl populations in deserts. ...
Journal of Herpetology, 2003
Survival of adult Desert Tortoises (Gopherus agassizii) appears related to site-specific variatio... more Survival of adult Desert Tortoises (Gopherus agassizii) appears related to site-specific variation in precipitation and productivity of annual plants. We studied adult tortoise survival rates at two closely situated, but physiographically different, sites in the eastern Mojave Desert over a nine-year period (spring 1992 to spring 2001). Survival rates were initially derived from population surveys conducted over a threeyear period and by radio-telemetry monitoring over a seven-year period beginning in 1994. After a period of initial stability, survival rates on the two sites diverged over the study period, and seven-year survival rates estimated from radio-telemetry monitoring were 0.900 and 0.269, respectively. A die-off in 1996 on the latter site appears to have been triggered by a period of drought, which began in the summer of 1995, coupled with a failure of annual vegetation production in 1996. Depressed survival rates on this site were associated with drought conditions during three of four years. Although the decline had the appearance of an epizootic, there were no clinical signs of disease. Relatively short-term drought, combined with little or no annual biomass, appears to have caused severe reductions in tortoise survival. If periods of droughtinduced low survival are common over relatively small areas, then source-sink population dynamics may be an important factor determining tortoise population densities.
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Papers by Kathleen Longshore