Document Detail

Locomotor muscle profile of a deep (Kogia breviceps) versus shallow (Tursiops truncatus) diving cetacean.
MedLine Citation:
PMID:  23355398     Owner:  NLM     Status:  Publisher    
When a marine mammal dives, breathing and locomotion are mechanically uncoupled, and its locomotor muscle must power swimming when oxygen is limited. The morphology of that muscle provides insight into both its oxygen storage capacity and its rate of oxygen consumption. This study investigated the m. longissimus dorsi, an epaxial swimming muscle, in the long duration, deep-diving pygmy sperm whale (Kogia breviceps) and the short duration, shallow-diving Atlantic bottlenose dolphin (Tursiops truncatus). Muscle myoglobin content, fiber type profile (based upon myosin ATPase and succinate dehydrogenase assays), and fiber size were measured for five adult specimens of each species. In addition, a photometric analysis of sections stained for succinate dehydrogenase was used to create an index of mitochondrial density. The m. longissimus dorsi of K. breviceps displayed significantly a) higher myoglobin content, b) larger proportion of Type I (slow oxidative) fibers by area, c) larger mean fiber diameters, and d) lower indices of mitochondrial density than that of T. truncatus. Thus, this primary swimming muscle of K. breviceps has greater oxygen storage capacity, reduced ATP demand, and likely a reduced rate of oxygen consumption relative to that of T. truncatus. The locomotor muscle of K. breviceps appears able to ration its high onboard oxygen stores, a feature that may allow this species to conduct relatively long duration, deep dives aerobically. J. Morphol., 2013. © 2013 Wiley Periodicals, Inc.
Caitlin E Kielhorn; Richard M Dillaman; Stephen T Kinsey; William A McLellan; D Mark Gay; Jennifer L Dearolf; D Ann Pabst
Related Documents :
23439418 - Effects of eccentrically and concentrically biased training on mouse muscle phenotype.
2983258 - Heterogeneity of congenital motor and sensory neuropathies.
24711008 - Mitochondrial myopathy with dystrophic features due to a novel mutation in the mttm gene.
8804688 - A quantitative analysis of rat central nervous system myelination using the immunohisto...
7319838 - Histochemical studies on the postnatal development of autonomic nerves in mice cerebral...
10052058 - Epilepsy and seizure classification in 63 dogs: a reappraisal of veterinary epilepsy te...
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-28
Journal Detail:
Title:  Journal of morphology     Volume:  -     ISSN:  1097-4687     ISO Abbreviation:  J. Morphol.     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-28     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0406125     Medline TA:  J Morphol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2013 Wiley Periodicals, Inc.
University of North Carolina Wilmington, Department of Biology & Marine Biology, Wilmington, North Carolina.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Ability to determine the desferrioxamine-chelatable iron fractions of nontransferrin-bound iron usin...
Next Document:  Copper-Catalyzed Oxidative Coupling of Alkenes with Aldehydes: Direct Access to ?,?-Unsaturated Keto...