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Yolk Androgens And Development In American Kestrel Nestlings, Melanie Dawn Berg
Yolk Androgens And Development In American Kestrel Nestlings, Melanie Dawn Berg
Boise State University Theses and Dissertations
Maternally derived yolk androgens affect many aspects of phenotypic development. To explore this phenomenon I injected clutches of American kestrels (Falco sparverius) with one of three different dosages of testosterone + androstenedione or with vehicle. Morphological measurements taken from nestlings 26 days after hatching showed no significant treatment effect. In 2007, nestlings with more yolk androgens had lower hatching mass and higher hematocrit levels 15 days after hatching than nestlings with less yolk androgens, but the effects disappeared by day 26. In 2008, there were no effects of androgens on mass or hematocrit. Because the results were not …
Diet And Behavior Of Ferruginous Hawks Nesting In Two Grasslands In New Mexico With Differing Anthropogenic Alteration, William Hanlon Keeley
Diet And Behavior Of Ferruginous Hawks Nesting In Two Grasslands In New Mexico With Differing Anthropogenic Alteration, William Hanlon Keeley
Boise State University Theses and Dissertations
I analyzed regurgitated pellets, prey remains, and video recordings to describe Ferruginous Hawk (Buteo regalis) diet in two grasslands in New Mexico, USA, the Estancia Valley and the Plains of San Agustin, that differed in anthropogenic alteration. Video monitoring revealed Ferruginous Hawks provisioned nestlings with more biomass than pellet analysis estimates from the same nests. Three mammalian prey species, Botta’s pocket gopher (Thomomys bottae), Gunnison’s prairie dog (Cynomys gunnisoni), and desert cottontail (Sylvilagus audubonii)contributed similar proportions to Ferruginous Hawk diet in percent biomass while Botta's pocket gopher dominated diet in percent frequency. …