How does the cold stenothermal gadoid Lota lota survive high water temperatures during summer?
Identifieur interne : 000980 ( Main/Exploration ); précédent : 000979; suivant : 000981How does the cold stenothermal gadoid Lota lota survive high water temperatures during summer?
Auteurs : I. Hardewig [Allemagne] ; H O Pörtner ; P. Van DijkSource :
- Journal of comparative physiology. B, Biochemical, systemic, and environmental physiology [ 0174-1578 ] ; 2004.
Descripteurs français
- KwdFr :
- Acclimatation (physiologie), Anaérobiose (MeSH), Animaux (MeSH), Aérobiose (MeSH), Consommation d'oxygène (MeSH), Eau douce (MeSH), Foie (enzymologie), Foie (métabolisme), Muscles (enzymologie), Muscles (métabolisme), Métabolisme basal (MeSH), Poissons (métabolisme), Poissons (physiologie), Saisons (MeSH), Température (MeSH).
- MESH :
- enzymologie : Foie, Muscles.
- métabolisme : Foie, Muscles, Poissons.
- physiologie : Acclimatation, Poissons.
- Anaérobiose, Animaux, Aérobiose, Consommation d'oxygène, Eau douce, Métabolisme basal, Saisons, Température.
English descriptors
- KwdEn :
- Acclimatization (physiology), Aerobiosis (MeSH), Anaerobiosis (MeSH), Animals (MeSH), Basal Metabolism (MeSH), Fishes (metabolism), Fishes (physiology), Fresh Water (MeSH), Liver (enzymology), Liver (metabolism), Muscles (enzymology), Muscles (metabolism), Oxygen Consumption (MeSH), Seasons (MeSH), Temperature (MeSH).
- MESH :
- enzymology : Liver, Muscles.
- metabolism : Fishes, Liver, Muscles.
- physiology : Acclimatization, Fishes.
- Aerobiosis, Anaerobiosis, Animals, Basal Metabolism, Fresh Water, Oxygen Consumption, Seasons, Temperature.
Abstract
The cold-stenothermal freshwater gadid Lota lota inhabiting the potamic regions of lowland rivers in central Europe, is exposed to summer temperatures up to 25 degrees C, which is far above the thermal preferendum of this species. Oxygen consumption rates, determined in field catches sampled at different times of the year, revealed that the basal metabolic rate is depressed during summer when water temperatures are high (152+/-16 micromol O2 100 g(-1) h(-1)at 22 degrees C in July compared to 250+/-33 micromol O2 100 g(-1) h(-1) at 6 degrees C in November). This observation led us to investigate whether the observed depression of the metabolic rate is caused by oxygen limitation due to thermal impairment of the ventilatory system, as has been observed in other species. Determination of anaerobic end products (lactate and succinate) in the liver tissue of fish caught at different sampling dates did not show an accumulation of anaerobic end products during the summer, indicating no oxygen limitation. Measurements of enzyme activities in the white musculature and liver suggest that enzymes involved in aerobic metabolism were down-regulated during summer, which may have contributed to the observed reduction of metabolic rate.
DOI: 10.1007/s00360-003-0399-8
PubMed: 14657998
Affiliations:
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Hardewig</name><affiliation wicri:level="3"><nlm:affiliation>Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Department of Biology and Ecology of Fishes, Müggelseedamm 301, 12587 Berlin, Germany. hardewig@igb-berlin.de</nlm:affiliation><country xml:lang="fr">Allemagne</country><wicri:regionArea>Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Department of Biology and Ecology of Fishes, Müggelseedamm 301, 12587 Berlin</wicri:regionArea><placeName><region type="land" nuts="3">Berlin</region><settlement type="city">Berlin</settlement></placeName></affiliation></author><author><name sortKey="Portner, H O" sort="Portner, H O" uniqKey="Portner H" first="H O" last="Pörtner">H O Pörtner</name></author><author><name sortKey="Van Dijk, P" sort="Van Dijk, P" uniqKey="Van Dijk P" first="P" last="Van Dijk">P. 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Hardewig</name><affiliation wicri:level="3"><nlm:affiliation>Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Department of Biology and Ecology of Fishes, Müggelseedamm 301, 12587 Berlin, Germany. hardewig@igb-berlin.de</nlm:affiliation><country xml:lang="fr">Allemagne</country><wicri:regionArea>Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Department of Biology and Ecology of Fishes, Müggelseedamm 301, 12587 Berlin</wicri:regionArea><placeName><region type="land" nuts="3">Berlin</region><settlement type="city">Berlin</settlement></placeName></affiliation></author><author><name sortKey="Portner, H O" sort="Portner, H O" uniqKey="Portner H" first="H O" last="Pörtner">H O Pörtner</name></author><author><name sortKey="Van Dijk, P" sort="Van Dijk, P" uniqKey="Van Dijk P" first="P" last="Van Dijk">P. Van Dijk</name></author></analytic><series><title level="j">Journal of comparative physiology. 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Oxygen consumption rates, determined in field catches sampled at different times of the year, revealed that the basal metabolic rate is depressed during summer when water temperatures are high (152+/-16 micromol O2 100 g(-1) h(-1)at 22 degrees C in July compared to 250+/-33 micromol O2 100 g(-1) h(-1) at 6 degrees C in November). This observation led us to investigate whether the observed depression of the metabolic rate is caused by oxygen limitation due to thermal impairment of the ventilatory system, as has been observed in other species. Determination of anaerobic end products (lactate and succinate) in the liver tissue of fish caught at different sampling dates did not show an accumulation of anaerobic end products during the summer, indicating no oxygen limitation. Measurements of enzyme activities in the white musculature and liver suggest that enzymes involved in aerobic metabolism were down-regulated during summer, which may have contributed to the observed reduction of metabolic rate.</div></front></TEI><affiliations><list><country><li>Allemagne</li></country><region><li>Berlin</li></region><settlement><li>Berlin</li></settlement></list><tree><noCountry><name sortKey="Portner, H O" sort="Portner, H O" uniqKey="Portner H" first="H O" last="Pörtner">H O Pörtner</name><name sortKey="Van Dijk, P" sort="Van Dijk, P" uniqKey="Van Dijk P" first="P" last="Van Dijk">P. Van Dijk</name></noCountry><country name="Allemagne"><region name="Berlin"><name sortKey="Hardewig, I" sort="Hardewig, I" uniqKey="Hardewig I" first="I" last="Hardewig">I. Hardewig</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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