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Burrowing Owl (Athene Cunicularia) Population Genetics : A Comparison of North American Forms and Migratory Habits
Contributor:Korfanta, N. M.; McDonald, David; Glenn, T. C.
We assessed the effects of range disjunction, migratory habit, coloniality, and habitat structure on the genetic differentiation of North American Burrowing Owl (Athene cunicularia) populations. Burrowing Owls in North ...
Hibernating Bears Conserve Muscle Strength and Maintain Fatigue Resistance
Contributor:Lohuis, T. D.; Harlow, Henry; Beck, T. D. I.; Iaizzo, P. A.
Black bears spend several months each winter confined to a small space within their den without food or water. In nonhibernating mammals, these conditions typically result in severe muscle atrophy, causing a loss of strength ...
Sage-Grouse and Indirect Interactions : Potential Implications of Coyote Control on Sage-Grouse Populations
Contributor:Mezquida, E. T.; Slater, S. J.; Benkman, Craig
Coyotes (Canis latrans) are lethally controlled throughout the range of Greater Sage-Grouse (Centrocercus urophasianus) and it has been suggested that such control may benefit sage-grouse. However, the perceived benefits ...
Obligatory Urea Production and the Cost of Living in the Magadi Tilapia Revealed by Acclimation to Reduced Salinity and Alkalinity
Contributor:Wood, C. M.; Wilson, P.; Bergman, Harold; Bergman, A. N.
Alcolapia grahami is a unique ureotelic tilapia that lives in the highly alkaline, saline Lake Magadi, Kenya (pH, ~10.0; alkalinity, ~380 mmol L-1; Na+, ~350 mmol L-1; Cl-, ~110 mmol L-1; osmolality, ~580 mosm kg-1). The ...
Protein Use and Muscle-Fiber Changes in Free-Ranging, Hibernating Black Bears
Contributor:Tinker, D. B.; Harlow, Henry; Beck, T. D. I.
Studies of the metabolic and physiological changes that bears undergo during hibernation have, for the most part, supported the paradigm that bears use only fatty tissues as a metabolic substrate during hibernation. This ...
Microsatellite Analysis Reveals Genetic Monogamy Among Female Boreal Owls
Contributor:Koopman, M. E.; McDonald, David; Hayward, G. D.
Torpor and Other Physiological Adaptations of the Badger (Taxidea-Taxus) to Cold Environments
Oxygen consumption (Vo2) and heart rate were measured at ambient temperatures between +20 and -40 C. Basal metabolic rate was 0.3 cm3/g·h (65 beats/min), the body temperature was 38 C, the lower critical temperature (Tlc) ...
Observations of Notable Parental Behaviours of Northern Spotted Owls (Strix occidentalis caurina)
Contributor:Alston, Jesse Marion; Millard, Janet E.; Rick, Jessica A.; Husby, Brandon W.; Mundy, Laurel A.
Northern Spotted Owl (Strix occidentalis caurina) is a medium-sized forest owl of conservation concern in the Pacific Northwest of North America. We report two sightings of previously unreported parental behaviour: a ...
Plumage Development and Molt in Long-Tailed Manakins (Chiroxiphia Linearis) : Variation According to Sex and Age
Contributor:Doucet, S. M.; McDonald, David; Foster, M. S.; Clay, R. P.
Lek-mating Long-tailed Manakins (Chiroxiphia linearis) exhibit an unusual pattern of delayed plumage maturation. Each year, males progress through a series of predefinitive plumages before attaining definitive plumage in ...
Cyanogenic Glycoside Amygdalin Does Not Deter Consumption of Ripe Fruit by Cedar Waxwings, The
Contributor:Struempf, H. M.; Schondube, J. E.; del Rio, Carlos Martinez
Cyanogenic glycosides are common secondary compounds in ripe fruits that are dispersed by birds. These substances are toxic to some mammals. We examined the repellent effect of amygdalin, a cyanogenic glycoside, on Cedar ...