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Assessing The Condition Of Juvenile Song Sparrows (Melospiza Melodia) Using Stable Nitrogen And Carbon Isotopes, Bethany L. Kempster
Assessing The Condition Of Juvenile Song Sparrows (Melospiza Melodia) Using Stable Nitrogen And Carbon Isotopes, Bethany L. Kempster
Digitized Theses
Offspring condition may predict a population’s future success. We studied the effects of nutritional stress on Δ N and Δ C in juvenile Song Sparrows (Melospiza melodia) handreared under ad libitum or food-stressed conditions, and compared them to conventional measures of condition. The degree of food stress significantly altered development, causing poor condition and increased corticosterone, glucose, and anemia. Despite this, we could not detect nutritional stress as measured by Δ N or Δ C and the birds did not display increased developmental instability. 15N enrichment may require greater levels of nutritional stress than used in this experiment. Δ C …