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| Natura: | Artículo científico |
| Lingua: | en |
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Journal of comparative physiology. B, Biochemical, systemic, and environmental physiology
2025
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| Accesso online: | https://pubmed.ncbi.nlm.nih.gov/41028286/ |
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| _version_ | 1868266146699935745 |
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| author | Giacomin, Marina Schulte, Patricia M Wood, Chris M |
| author_facet | Giacomin, Marina Schulte, Patricia M Wood, Chris M Giacomin, Marina Schulte, Patricia M Wood, Chris M |
| collection | PubMed - marine biology |
| contents | Osmorespiratory compromise in an elasmobranch: oxygen consumption, ventilation and nitrogen metabolism in dogfish sharks (Squalus suckleyi) exposed to hypoxia in different salinities. Giacomin, Marina Schulte, Patricia M Wood, Chris M Animals Oxygen Consumption Hypoxia Nitrogen Urea Osmolar Concentration Respiration Sharks Squalus Dogfish Oxygen Gills Fish face a functional trade-off at the gills between minimizing ion movement and maximizing oxygen uptake - the osmorespiratory compromise, but the extent of this trade-off remains poorly understood in elasmobranchs. Using the Pacific dogfish shark, we assessed the impacts of progressive hypoxia in animals acclimated to 25, 30 and 36 ppt for 4 days at 12 °C. Plasma osmolality increased with water osmolality at 36 ppt (osmoconformation) and decreased at 25 ppt. Plasma urea decreased at 25 ppt, though to a lesser extent than plasma Cl, while plasma urea increased to a greater extent than plasma Cl at 36 ppt. In normoxia, oxygen consumption rate (MO) was elevated by 60% at 36 ppt, and ventilatory index (frequency x amplitude) was elevated by 70%, reflecting increases in both components of ventilation, but these parameters remained unchanged in sharks exposed to 25 ppt. During progressive hypoxia, MO and ventilation exhibited different patterns at the three salinities, but in all three, MO fell linearly below a water PO of ~ 80 Torr (10.7 kPa), indicating oxyconformation. Under hypoxia (45 to 5 Torr; 6.0 to 0.7 kPa) MO was the same at all salinities, while ventilatory amplitude was elevated at both 25 and 30 ppt. At 36 ppt, frequency decreased during hypoxia. Ventilatory index increased during hypoxia only at 30 ppt and not at the other salinities. From these data it is clear that dogfish sharks face an osmorespiratory compromise balancing the needs for urea retention against those of O uptake. |
| format | Artículo científico |
| id | pubmed_41028286 |
| institution | PubMed |
| language | en |
| publishDate | 2025 |
| publisher | Journal of comparative physiology. B, Biochemical, systemic, and environmental physiology |
| record_format | pubmed |
| spellingShingle | Osmorespiratory compromise in an elasmobranch: oxygen consumption, ventilation and nitrogen metabolism in dogfish sharks (Squalus suckleyi) exposed to hypoxia in different salinities. Giacomin, Marina Schulte, Patricia M Wood, Chris M Animals Oxygen Consumption Hypoxia Nitrogen Urea Osmolar Concentration Respiration Sharks Squalus Dogfish Oxygen Gills Osmorespiratory compromise in an elasmobranch: oxygen consumption, ventilation and nitrogen metabolism in dogfish sharks (Squalus suckleyi) exposed to hypoxia in different salinities. Giacomin, Marina Schulte, Patricia M Wood, Chris M Animals Oxygen Consumption Hypoxia Nitrogen Urea Osmolar Concentration Respiration Sharks Squalus Dogfish Oxygen Gills Fish face a functional trade-off at the gills between minimizing ion movement and maximizing oxygen uptake - the osmorespiratory compromise, but the extent of this trade-off remains poorly understood in elasmobranchs. Using the Pacific dogfish shark, we assessed the impacts of progressive hypoxia in animals acclimated to 25, 30 and 36 ppt for 4 days at 12 °C. Plasma osmolality increased with water osmolality at 36 ppt (osmoconformation) and decreased at 25 ppt. Plasma urea decreased at 25 ppt, though to a lesser extent than plasma Cl, while plasma urea increased to a greater extent than plasma Cl at 36 ppt. In normoxia, oxygen consumption rate (MO) was elevated by 60% at 36 ppt, and ventilatory index (frequency x amplitude) was elevated by 70%, reflecting increases in both components of ventilation, but these parameters remained unchanged in sharks exposed to 25 ppt. During progressive hypoxia, MO and ventilation exhibited different patterns at the three salinities, but in all three, MO fell linearly below a water PO of ~ 80 Torr (10.7 kPa), indicating oxyconformation. Under hypoxia (45 to 5 Torr; 6.0 to 0.7 kPa) MO was the same at all salinities, while ventilatory amplitude was elevated at both 25 and 30 ppt. At 36 ppt, frequency decreased during hypoxia. Ventilatory index increased during hypoxia only at 30 ppt and not at the other salinities. From these data it is clear that dogfish sharks face an osmorespiratory compromise balancing the needs for urea retention against those of O uptake. |
| title | Osmorespiratory compromise in an elasmobranch: oxygen consumption, ventilation and nitrogen metabolism in dogfish sharks (Squalus suckleyi) exposed to hypoxia in different salinities. |
| topic | Animals Oxygen Consumption Hypoxia Nitrogen Urea Osmolar Concentration Respiration Sharks Squalus Dogfish Oxygen Gills |
| url | https://pubmed.ncbi.nlm.nih.gov/41028286/ |