Temporal dynamics in growth and white skeletal muscle composition of the mummichog Fundulus heteroclitus during chronic hypoxia and hyperoxia
| Autor: | Benjamin J. Ciotti, S. S. Akkina, A. M. Gallaty, C. A. Tolman, Timothy E. Targett, Bernard B. Rees |
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| Rok vydání: | 2012 |
| Předmět: |
medicine.medical_specialty
Time Factors chemistry.chemical_element Muscle Proteins Aquatic Science Hyperoxia Oxygen chemistry.chemical_compound Internal medicine Lactate dehydrogenase Fundulidae medicine Animals Killifish Hypoxia Muscle Skeletal Ecology Evolution Behavior and Systematics biology L-Lactate Dehydrogenase Skeletal muscle DNA biology.organism_classification Fundulus Mummichog medicine.anatomical_structure Endocrinology chemistry RNA Composition (visual arts) medicine.symptom |
| Zdroj: | Journal of fish biology. 81(1) |
| ISSN: | 1095-8649 |
| Popis: | Specific growth rate (G(S) ) and white skeletal muscle composition were measured in the mummichog Fundulus heteroclitus over a period of 28 days at four levels of dissolved oxygen (DO): severe hypoxia (c. 1.2 mg O(2) l(-1) ), moderate hypoxia (3.0 mg O(2) l(-1) ), normoxia (7.1 mg O(2) l(-1) ) and hyperoxia (10.6 mg O(2) l(-1) ). The G(S) was calculated over 0-8, 0-14, 0-28 and 14-28 days, and muscle protein, lactate dehydrogenase (LDH), DNA, RNA and water were measured at 0, 8, 14 and 28 days. Exposure of fish to severe hypoxia was associated with significantly reduced G(S) , lower muscle protein content and lower RNA:DNA compared with other DO treatments. When calculated over the first and second half of the 28 day exposure, however, G(S) of fish in severe hypoxia increased significantly during the second two-week interval, to the same rate as that of normoxic fish. Muscle LDH activity and water content were not significantly affected by DO level. Neither moderate hypoxia nor hyperoxia significantly affected G(S) or any biochemical variable. The results demonstrate that F. heteroclitus can tolerate wide variation in ambient oxygen concentration and, during prolonged exposure to severe hypoxia, shows significant compensation for the initial negative effects on growth. The capacity of F. heteroclitus to grow over a wide range of DO probably contributes to its ability to exploit habitats characterized by marked variation in oxygen availability. |
| Databáze: | OpenAIRE |
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