| Popis: |
In vitro blood‐oxygen binding curves for the bat ray, Myliobatis californica, were constructed at four temperatures (8, 14, 20, and 26°C) to gain insight into the possible adaptations to ambient temperature regimes in Tomales Bay, California. The curves were hyperbolic (mean n50: 1.06) with high affinities (P50: 0.8–3.2 kPa) and large whole blood buffer values (s: ‐14.25 to ‐16.43 slykes) implying a tolerance to hypoxia and hypercap‐nia while large O2 capacities (CBO2: 3.1–4.1 mmol.L‐1) and Bohr factors (O: ‐0.45 to ‐0.52) indicated high activity levels. The temperature effect (?H) was greatest between 14 and 20°C as compared to relatively temperature independent binding between the 8 to 14°C, and 20 to 26°C ranges. The heightened sensitivity between 14 and 20°C parallels a previously‐documented large change in respiratory demand for this same temperature range (Q10 = 6.81). However, the magnitude of the hematological adjustments were small relative to the large increase in metabolic demand and it is like... |
