Keith A. Hobson

TL;DR: It is shown that butterflies which overwintered in Mexico came from a wide breeding distribution, including southern portions of the range, which indicated that conserving breeding habitat in the Midwest alone is insufficient to ensure long-term persistence of the monarch butterfly population in eastern North America.

TL;DR: In this paper, the trophic and dietary differences suggested by stable-nitrogen and carbon isotope data were useful in explaining the spatial patterns of contaminant concentrations observed among colonies of seabirds such as the glaucous gull and the black-legged kittiwake where variation in latitudinal atmospheric deposition patterns and different overwintering grounds did not appear to be confounding factors.

TL;DR: Despite social foraging, the results indicate highly variable diets among individuals and this is discussed in terms of individual versus group ecology of boreal wolves.

TL;DR: Stable-isotope analyses of egg components can illuminate the contributions of endogenous and exogenous nutrients to egg formation in cases where birds move from one isotopic biome to another just before egg-laying, as in Red Knots and Ruddy Turnstones nesting in the northeastern Canadian High Arctic.

TL;DR: The narrow distribution of δ13C values for Western Gulls from the Southeast Farallon Island colony suggests that gull colonies may be calibrated so that changes in dependence on terrestrial protein can be monitored.