Journal Title
Title of Journal: J Comp Physiol B
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Abbravation: Journal of Comparative Physiology B
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Publisher
Springer-Verlag
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Authors: Keri C Lestyk L P Folkow A S Blix M O Hammill J M Burns
Publish Date: 2009/06/30
Volume: 179, Issue: 8, Pages: 985-
Abstract
Pinnipeds rely on muscle oxygen stores to help support aerobic diving therefore muscle maturation may influence the behavioral ecology of young pinnipeds To investigate the pattern of muscle development myoglobin concentration Mb and acid buffering ability β was measured in ten muscles from 23 harp and 40 hooded seals of various ages Adult Mb ranged from 28–97 to 35–104 mg g tissue−1 in harp and hooded seals respectively with values increasing from the cervical nonswimming muscles to the main swimming muscles of the lumbar region Neonatal and weaned pup muscles exhibited lower ~30 adult values and less variable Mb across the body than adults In contrast adult β showed little regional variation 60–90 slykes while high pup values ~75 adult values indicate significant in utero development These findings suggest that intrauterine conditions are sufficiently hypoxic to stimulate prenatal β development but that Mb development requires additional postnatal signal such as exercise and/or growth factors However because of limited development in both β and Mb during the nursing period pups are weaned with muscles with lower aerobic and anaerobic capacities than those of adults
Keywords:
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