Now showing items 1-10 of 43
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Fasting Biochemistry of Representative Spontaneous and Facultative Hibernators : The White-Tailed Prairie Dog and the Black-Tailed Prairie Dog
The white-tailed prairie dog is a spontaneous hibernator that enters art anorexic state followed by torpor in early fall. The black-tailed prairie dog is a facultative hibernator that enters torpor only when deprived of ...
Microsatellite Analysis Reveals Genetic Monogamy Among Female Boreal Owls
Contributor:Koopman, M. E.; McDonald, David; Hayward, G. D.
Low Levels of Population Genetic Structure in Pinus Contorta (Pinaceae) Across a Geographic Mosaic of Co-Evolution
Contributor:Parchman, T. L.; Benkman, Craig; Jenkins, B.; Buerkle, C. A.
Premise of the study: Population genetic analyses provide information on the population context in which evolutionary processes operate and are important for understanding the evolution of geographically variable traits. ...
Do Nectar- and Fruit-Eating Birds Have Lower Nitrogen Requirements Than Omnivores? : an Allometric Test
Contributor:Tsahar, E.; Ara, Z.; Izhaki, I.; del Rio, Carlos Martinez
We used an allometric approach to compare the minimum nitrogen requirements (MNR) and the total endogenous nitrogen loss (TENL) of nectar- and fruit-eating birds with those of omnivorous birds. These two parameters were ...
Using Historical Dna to Characterize Hybridization Between Baltimore Orioles (Icterus Galbula) and Bullock's Orioles (I. Bullockii)
Contributor:Carling, Matthew; Serene, L. G.; Lovette, I. J.
Studies of genetic variation across hybrid zones have demonstrated that the evolutionary dynamics within them are often complicated. Using DNA extracted from toe pads of 701 individuals collected by Sibley and Short (1964) ...
Cone and Seed Trait Variation in Whitebark Pine (Pinus Albicaulis; Pinaceae) and the Potential for Phenotypic Selection
Contributor:Garcia, R.; Siepielski, A. M.; Benkman, Craig
Phenotypic variation among, individuals is necessary for natural selection to operate and is therefore essential for adaptive evolution. However, extensive variation within individuals can mask variation among individuals ...
Comparative Plasma and Urine Chemistry of Fasting White-Tailed Prairie Dogs (Cynomys-Leucurus) and American Martens (Martes-Americana) : Representative Fat-Bodied and Lean-Bodied Animals
Contributor:Harlow, Henry; Buskirk, Steven
American martens and white-tailed prairie dogs are mammals of similar body mass, exposed to periods of food deprivation, but of vastly different body fat content. While both species demonstrated a protein conservation phase ...
Responses of an Amazonian Teleost, the Tambaqui (Colossoma Macropomum), to Low Ph in Extremely Soft Water
Contributor:Wood, C. M.; Wilson, R. W.; Gonzalez, R. J.; Patrick, M. L.; Bergman, Harold; Narahara, A.; Val, A. L.
Our goal was to compare the internal physiological responses to acid challenge in an acidophilic tropical teleost endemic to dilute low-pH waters with those in nonacidophilic temperate species such as salmonids, which have ...
Effects of Water Ph and Calcium Concentration on Ion Balance in Fish of the Rio Negro, Amazon
Contributor:Gonzalez, R. J.; Wood, C. M.; Wilson, R. W.; Patrick, M. L.; Bergman, Harold; Narahara, A.; Val, A. L.
We examined the effects of acute low-pH exposure on ion balance (Na+, Cl-, K+) in several species of fish captured from the Rio Negro, a dilute, acidic tributary of the Amazon. At pH 5.5 (untreated Rio Negro water), the ...
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 ...