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1 September 2015 Resting Metabolic Rates of Adult Northern Shrikes (Lanius excubitor) Wintering in Northern Wisconsin
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Abstract

Resting metabolic rate (RMR) represents a significant component of an animal’s energy budget and is correlated with ecological, physiological, and life-history parameters. We measured resting metabolic rates of 14 adult Northern Shrikes (Lanius excubitor) wintering in northern Wisconsin (Ashland and Bayfield Counties) over a 2-year period (Jan–Apr 2008 and 2009). The average (±SE) RMR was 3.09 ± 0.45 ml O2/g/hr (range 2.46–3.83) from the first reported RMR values for adults of this species from the Neartic. Our RMR values were 50% higher than RMRs gathered from summer adult Northern Shrikes in the Paleartic. These data suggest Northern Shrikes exhibit seasonal variation in their RMR as a potential means of winter acclimatization.

© 2015 The Wilson Ornithological Society
James D. Paruk, Sheldon J. Cooper, Anna O. Mangan, Ryan S. Brady, and Logan Tucker "Resting Metabolic Rates of Adult Northern Shrikes (Lanius excubitor) Wintering in Northern Wisconsin," The Wilson Journal of Ornithology 127(3), 510-514, (1 September 2015). https://doi.org/10.1676/14-061.1
Received: 16 April 2014; Accepted: 1 January 2015; Published: 1 September 2015
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