A longitudinal and cross-sectional analysis of total body oxygen store development in nursing harbor seals (<Emphasis Type="Italic">Phoca vitulina</Emphasis>) |
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Authors: | Cheryl A Clark Jennifer M Burns Jason F Schreer Mike O Hammill |
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Institution: | (1) Department of Biological Sciences, University of Alaska Anchorage, 3211 Providence Drive, Anchorage, AK 99508, USA;(2) Department of Biology, State University of New York at Potsdam, Potsdam, NY 13676, USA;(3) Department of Fisheries and Oceans, Institute Maurice-Lamontagne, 850 Route de la Mer, C.P. 1000, Mont Joli, QC, G5H 3Z4, Canada;(4) Alaska Department of Fish and Game, Wildlife Conservation, 525 W, 67th Ave, Anchorage, AK 99518, USA |
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Abstract: | This study compared the efficacy of longitudinal and cross-sectional sampling regimes for detecting developmental changes
in total body oxygen (TBO2) stores that accompany behavioral development in free-ranging harbor seal pups. TBO2 stores were estimated for pup (n = 146) and adult female (n = 20) harbor seals. Age related changes were compared between pups captured repeatedly during the lactation period (longitudinal
dataset) and a second group of pups handled only once (cross-sectional dataset). At each handling, hematocrit, hemoglobin,
red blood cell count, total plasma volume, blood volume, muscle myoglobin concentration, and blood and muscle oxygen stores
were determined. Comparisons across age categories revealed newborn blood oxygen stores were initially elevated, declined
to low values by early lactation, and increased through post-weaning. Muscle oxygen stores remained low and constant throughout
lactation and only increased significantly post-weaning. Overall TBO2 stores increased 17% during lactation, and weaned pups had TBO2 stores that were 55% as large as those of adults. Thus, significant increases in TBO2 stores must occur after weaning, as pups begin to forage independently. Results from the two sampling schemes did not differ,
indicating that the logistically simpler cross-sectional design can be used to monitor physiological development in harbor
seals. |
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Keywords: | Development Harbor seals Hematology Myoglobin Oxygen stores |
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