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1 April 2013 Low Oxygen-Carrying Capacity of Blood May Increase Developmental Instability of Molt in Migrating Waders
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Abstract

The degree of asymmetry in feather replacement may be considered a reliable measure of developmental instability of avian molt. Although empirical evidence exists for the fitness consequences of molt asymmetry, the proximate cause of asymmetrical molt remains unknown. We tested for the possibility of a link between asymmetry in feather replacement and hemoglobin concentration of first-year Common Snipe (Gallinago gallinago) during the partial postjuvenile molt. Advancement and symmetry of molt were determined for 637 first-year Common Snipe captured at Jeziorsko reservoir, central Poland, during autumn migration. We found that the probability of asymmetrical molt did not vary with date of capture (W = 1.66, P = 0.20), but Common Snipe with lower hemoglobin concentrations had a higher probability of asymmetrical molt (W = 5.22, P = 0.022). Because Common Snipe molt during migration, high oxygen-carrying capacity of blood is presumably necessary to meet aerobic demands of the tissues during long-distance flights. We suggest that under these conditions, low hemoglobin concentrations may lead to an acute organismal hypoxia causing disruptions in developmental homeostasis, such as asymmetrical feather replacement.

© 2013 by The American Ornithologists' Union. All rights reserved. Please direct all requests for permission to photocopy or reproduce article content through the University of California Press's Rights and Permissions website, http://www.ucpressjournals.com/reprintInfo.asp.
Piotr Minias, Krzysztof Kaczmarek, Radosław Włodarczyk, and Tomasz Janiszewski "Low Oxygen-Carrying Capacity of Blood May Increase Developmental Instability of Molt in Migrating Waders," The Auk 130(2), 308-312, (1 April 2013). https://doi.org/10.1525/auk.2013.12184
Received: 5 October 2012; Accepted: 1 December 2012; Published: 1 April 2013
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