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Full-Text Articles in Physical Sciences and Mathematics
Surgical Sterilization As A Method Of Reducing Coyote Predation On Domestic Sheep, Cassity Bromley, Eric M. Gese
Surgical Sterilization As A Method Of Reducing Coyote Predation On Domestic Sheep, Cassity Bromley, Eric M. Gese
United States Department of Agriculture Wildlife Services: Staff Publications
Predation by coyotes (Canis latrans) on domestic sheep is a problem for many livestock producers throughout the United States Intermountain West. We examined whether surgical sterilization of coyote packs would modify their predatory behavior and reduce predation rates on domestic sheep as compared to coyote packs with pups. From June 1997 to December 1997, we gathered baseline information on coyote pack size and movements. In winter 1998, we surgically sterilized and radio-collared members of 5 coyote packs. We also captured and radio-collared members of 6 packs that remained intact (i.e., reproductive). During summer 1998, only 1 sterile pack …
Using Iophenoxic Acid Injections Of Prey To Identify Mammals That Feed On Them, Frederick F. Knowlton, Stanley R. Olmstead
Using Iophenoxic Acid Injections Of Prey To Identify Mammals That Feed On Them, Frederick F. Knowlton, Stanley R. Olmstead
United States Department of Agriculture Wildlife Services: Staff Publications
Identifying species or individuals that feed upon other species of animals is an important aspect of some predation studies. We evaluated the effectiveness with which the biomark associated with iophenoxic acid (IA) injections was transferred from domestic goats to coyotes (Canis latrans) that fed on them. We injected doses of 100, 300, or 1,000 mg of IA into goats to raise serum iodine levels, fed meat from the injected goats to coyotes, and monitored serum iodine levels in both species for about I20 days. Within 3 days, mean serum iodine levels in goats increased from 5.33 mcg/I 00 ml to …
Impacts Of Predation On Northern Bobwhite And Scaled Quail, Dale Rollins, John P. Carroll
Impacts Of Predation On Northern Bobwhite And Scaled Quail, Dale Rollins, John P. Carroll
School of Natural Resources: Faculty Publications
Northern bobwhite (Colinus virginianus) and scaled quail (Callipepla squamata) populations have declined throughout most of their distribution, and these declines have become more dramatic in recent years. In this review, we examine the role of predation in quail management. Predation is the major source of nest loss and of mortality for young and adult quail. Mean nest success across studies reviewed was 28%. Estimates of annual survival rates have varied from 5 to 26% for radiotelemetry studies and from 15 to 30% based on age-ratio studies. Breeding season survival estimates ranged from 13 to 51% in telemetry …