Post-dive blood lactate concentrations in emperor penguins, Aptenodytes forsteri
| Autor: | T. G. Kooyman, L N Starke, Paul J. Ponganis, C. A. Kooyman, Gerald L. Kooyman |
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| Rok vydání: | 1997 |
| Předmět: |
biology
Behavior Animal Physiology Aptenodytes Lactic acid blood Diving Anatomy Aquatic Science biology.organism_classification Birds Animal science Insect Science Blood lactate Animals Animal Science and Zoology Lactic Acid Diving physiology human activities Molecular Biology Ecology Evolution Behavior and Systematics |
| Zdroj: | The Journal of experimental biology. 200(Pt 11) |
| ISSN: | 0022-0949 |
| Popis: | In order to determine an aerobic diving limit (ADL) in emperor penguins (Aptenodytes forsteri), post-dive blood lactate concentrations were measured in penguins foraging at an isolated sea ice hole. Resting lactate concentrations were 1.2–2.7 mmol l−1. Serial samples revealed that lactate level usually peaked within 5 min after dives and that 7–12 min was required for lactate concentrations to decrease from 5–8 mmol l−1 to less than 2.5 mmol l−1. Post-dive lactate level was not elevated above 3 mmol l−1 for dives shorter than 5 min. Two-phase regression analysis revealed a transition at 5.6 min in the post-dive lactate level versus diving duration relationship. All dives longer than 7 min were associated with lactate concentrations greater than 5 mmol l−1. We conclude that the ADL in emperor penguins ranges between 5 and 7 min. These are the first determinations of post-dive lactate concentrations in any free-diving bird and are currently the only physiological assessment of an ADL in an avian species. |
| Databáze: | OpenAIRE |
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