Muskox dietary history and ambient environment.
Shown in the top is the muskox (Ovibos moschatus) dietary history inferred from the standardized nitrogen isotope ratios (δ15N) in guard hairs from 10 muskox cows and their mean (black line), covering approximately 2.5 years with a temporal resolution of app. 9 days. Below the stable isotope ratios are shown the ambient environmental conditions: Mean air temperature (°C), mean snow depth (m) and meadow productivity (NDVI) from the study area in the 9-day intervals. The guard hair dietary chronology matched the local environmental fluctuations, and included almost three full summer (high δ15N ratios) and winter periods (low δ15N ratios).
Compared to summer diets, winter diets exhibit more pronounced inter-annual variation.
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