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Changes in the blood and plasma volume of Harris' sparrows during postnuptial molt

Authors
Journal
Comparative Biochemistry and Physiology Part A Physiology
0300-9629
Publisher
Elsevier
Publication Date
Volume
81
Issue
4
Identifiers
DOI: 10.1016/0300-9629(85)90925-9
Disciplines
  • Biology

Abstract

Abstract 1. 1. In captive Harris' sparrows ( Zonotrichia querula), plasma and blood volume increased significantly during stages 2 and 3 of postnuptial molt, when extensive feather replacement was taking place in the wings, tail and body tracts. 2. 2. Erythrocyte number did not increase significantly until molt was essentially complete. 3. 3. Consequently the 6% mean maximum reduction in hematocrit that was observed during molt appeared to be largely the result of plasma volume expansion. 4. 4. This plasma volume expansion was not due to changes in the osmolality or concentration of proteins within the blood plasma since both decreased significantly during intense molt.

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