Temperature and CO2Effects on Blood O2Equilibria in Northern Squawfish,Ptychocheilus oregonensis
| Autor: | Todd E. Hopkins, Joseph J. Cech, Daniel T. Castleberry |
|---|---|
| Rok vydání: | 1994 |
| Předmět: |
Ptychocheilus
biology Ecology Analytical chemistry Environmental factor Aquatic Science Atmospheric temperature range biology.organism_classification medicine.disease_cause Cyprinus chemistry.chemical_compound Common carp chemistry Carbon dioxide medicine Hemoglobin Blood ph Ecology Evolution Behavior and Systematics |
| Zdroj: | Canadian Journal of Fisheries and Aquatic Sciences. 51:13-19 |
| ISSN: | 1205-7533 0706-652X |
| Popis: | In vitro blood O2equilibrium curves were constructed at 9, 15, 18, and 21 °C from temperature-acclimated northern squawfish, Ptychocheilus oregonensis. At low [Formula: see text] (50s generally showed variable increases with temperature from 3.6 mm Hg at 9 °C to 8.7 mm Hg at 21 °C, leading to whole-blood temperature effects (ΔH, kilocalories per mole O2) ranging from a low +4.4 at 15–18 °C to a peak −21.2 at 18–21 °C. High-[Formula: see text] (7.6 mm Hg) conditions decreased blood pH and increased P50s at each temperature (Bohr factor). Bohr factors (Φ) ranged from −0.46 at 21 °C to −0.70 at 18 °C. Considered together, ΔH and Φ values suggest an optimal temperature range of 15–18 °C for hemoglobin O2loading and unloading in northern squawfish. Nonbicarbonate buffer values ranged from −10.04 at 21 °C to −14.13 at 9 °C. Overall, the high O2affinities and hyperbolic blood O2equilibrium curves of northern squawfish resemble those of other large cyprinids (e.g., common carp, Cyprinus carpio, tench, Tinca tinca, Sacramento blackfish, Orthodon microlepidotus) indicating a better ability to tolerate hypoxic environments than sympatric rainbow trout, Oncorhynchus mykiss. High northern squawfish blood O2capacities and Φs suggest high aerobic capacity, especially at temperatures |
| Databáze: | OpenAIRE |
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