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  Age-related changes in hematocrit in the Galapagos sea lion (Zalophus wollebaeki) and the Weddell seal (Leptonychotes weddellii)

Trillmich, F., Rea, L., Castellini, M., & Wolf, J. B. W. (2008). Age-related changes in hematocrit in the Galapagos sea lion (Zalophus wollebaeki) and the Weddell seal (Leptonychotes weddellii). Marine Mammal Science, 24(2), 303-314. doi:10.1111/j.1748-7692.2007.00177.x.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-D6BE-8 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-D6BF-6
Genre: Journal Article

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Trillmich, F., et al., 2008, S-38773.pdf (Publisher version), 317KB
 
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 Creators:
Trillmich, Fritz, Author
Rea, Lorrie, Author
Castellini, Michael, Author
Wolf, Jochen B. W.1, Author              
Affiliations:
1Department Evolutionary Genetics, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_1445635              

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Free keywords: ontogeny; hematocrit; hemoglobin; Galapagos sea lion; Zalophus wollebaeki; Weddell seal; Leptonychotes weddellii
 Abstract: In mammals, hematocrit (Hct) is optimized between the divergent requirements of blood flow characteristics and oxygen transport and storage capacity. This trade-off plays a particularly major role in marine mammals, in which oxygen demand during sustained diving requires high Hct levels. Galapagos sea lions (Zalophas wollebaeki) need a long time after birth to develop from terrestrial life to the state of an independent forager at sea. We here show that pups were born with high Hct of 45%, then reduced Hct during the first 40 d of life to 31% while they remain constantly ashore, and increased Hct again until the adult level (57%) is reached at 1 yr of age when they begin to dive for foraging at sea. A similar, but much more rapidly changing pattern is seen in Weddell seal pups, but not in northern elephant seals, where no reduction in Hct is seen after birth. These and similarly changing patterns in terrestrial mammals likely reflect species specific functional adjustments during development due to a trade-off between the costs of circulation and the changing need to store and transport oxygen.

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Language(s): eng - English
 Dates: 2008-04
 Publication Status: Published in print
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 Rev. Method: -
 Identifiers: eDoc: 361817
DOI: 10.1111/j.1748-7692.2007.00177.x
Other: 2608/S 38773
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Title: Marine Mammal Science
Source Genre: Journal
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Pages: - Volume / Issue: 24 (2) Sequence Number: - Start / End Page: 303 - 314 Identifier: ISSN: 0824-0469