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          Institute: MPI für Evolutionsbiologie     Collection: Evolutionary genetics     Display Documents

ID: 361817.0, MPI für Evolutionsbiologie / Evolutionary genetics
Age-related changes in hematocrit in the Galapagos sea lion (Zalophus wollebaeki) and the Weddell seal (Leptonychotes weddellii)
Authors:Trillmich, Fritz; Rea, Lorrie; Castellini, Michael; Wolf, Jochen B. W.
Date of Publication (YYYY-MM-DD):2008-04
Title of Journal:Marine Mammal Science
Issue / Number:2
Start Page:303
End Page:314
Review Status:not specified
Audience:Not Specified
Abstract / Description: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.
Free Keywords:ontogeny; hematocrit; hemoglobin; Galapagos sea lion; Zalophus wollebaeki; Weddell seal; Leptonychotes weddellii
External Publication Status:published
Document Type:Article
Communicated by:Brigitte Lechner
Affiliations:MPI für Evolutionsbiologie/Abt. Evolutionsgenetik
External Affiliations:Univ Bielefeld, Dept Anim Behav, POB 100131, D-33501 Bielefeld, Germany; Univ Alaska, Inst Marine Sci, Fairbanks, AK 99775 USA
Identifiers:ISSN:0824-0469 [ID-No:1]
DOI:10.1111/j.1748-7692.2007.00177.x [ID-No:2]
LOCALID:2608/S 38773 [Listen-Nummer/S-Nummer]
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