Reconstructing avian diets using stable-carbon and nitrogen isotope analysis of egg components: patterns of isotopic fractionation and turnover

Article Abstract:

There are uniform patterns of isotopic fractionation between diet and yolk, albumen, yolk lipid, shell membranes and shell carbonate. This is in line with earlier captive readings which have confirmed the general predictability of departures of tissue isotope values, specifically for some mammalian tissues. The relative excess of naturally-occurring stable isotope of carbon and nitrogen in eggs should be related to those in the diets of the adult females as eggs are composed of nutrients derived from them. This is the basis for a method for tracing diets.

Usage, Carbon, Eggs, Eggs (Food), Nitrogen, Fractionation, Fractional distillation, Nitrogen isotopes

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Trophic relationship among seabirds in Central California: combined stable isotope and conventional dietary approach

Article Abstract:

The trophic relationships among seabirds in Central California was studied to determine their marine trophic relationships. The study made use of a stable isotope analysis (SIA) and techniques of diet assessment. Results illustrate the dynamic nature of trophic relationships in the area. Furthermore, the study shows the importance of SIA in determining marine food-web structure and foraging dynamics.

Food chains (Ecology), Food chains, Animal nutrition, Water birds, Isotope geology

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