Abstract

Temperature influences aerobic metabolism in the horseshoe crab Limulus polyphemus L. either very little (16–25 °C) or only moderately (4–16 °C) relative to the pattern found in many other temperature-zone animals. The compensatory mechanisms include the moderate temperature sensitivities of heart rate, ventilation rate and hemocyanin-O 2 affinity as well as a decrease in hemocyanin cooperativity at low temperature. The compensatory mechanisms also include the reverse Bohr shift which, unlike a normal Bohr shift, opposes rather than enhances the intrinsic increase in Hc-O 2 affinity at low temperature.

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