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Zooarchaeology of the Native American Sturgeon Fishery in Coastal Oregon, 350 BC to AD 1150
Contributor:Grindle, Elizabeth Dalyn
Sturgeons are not found often in the archaeological record due to their largely cartilaginous skeleton. What remains are the scutes, bony scale-like plates found on the outside of the body, and some diagnostic cranial ...
Are Hummingbirds Facultatively Ammonotelic?: Nitrogen Excretion and Requirements as a Function of Body Size
Contributor:McWhorter, T. J.; Powers, D. R.; del Rio, Carlos Martinez
Most birds are uricotelic. An exception to this rule may be nectar-feeding birds, which excrete significant amounts of ammonia under certain conditions. Although ammonia is toxic, because it is highly water soluble its ...
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 ...
Hummingbirds Fuel Hovering Flight with Newly Ingested Sugar
Contributor:Welch, K. C.; Bakken, B. H.; del Rio, Carlos Martinez; Suarez, R. K.
We sought to characterize the ability of hummingbirds to fuel their energetically expensive hovering flight using dietary sugar by a combination of respirometry and stable carbon isotope techniques. Broadtailed hummingbirds ...
It Takes Guts (And More) to Eat Fruit : Lessons from Avian Nutritional Ecology
Contributor:Levey, D. J.; del Rio, Carlos Martinez
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. ...
Isolation and Decline of a Population of the Orange-Breasted Falcon
Contributor:Berry, R. B.; Benkman, Craig; Muela, A.; Seminario, Y.; Curti, M.
Probably always rare and local because of its ecology and specialized habitat, the small, isolated population of the Orange-breasted Falcon (Falco deiroleucus) in Belize and Guatemala, likely numbering fewer than 40 ...
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 ...
Parental Investment Decisions in Response to Ambient Nest-Predation Risk Versus Actual Predation on the Prior Nest
Contributor:Chalfoun, Anna; Martin, T. E.
Theory predicts that parents should invest less in dependent offspring with lower reproductive value, such as those with a high risk of predation. Moreover, high predation risk can favor reduced parental activity when such ...
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) ...