PERCEPTION OF EXTERNAL OXYGEN BY THE BURROWING SHRIMP, CALLIANASSA CALIFORNIENSIS DANA AND C. AFFINIS DANA

Abstract
1. Pleopod ventilative responses in low-oxygen sea water were investigated in two species of Callianassa, with animals relatively unrestrained during experiments, in tubes simulating actual burrow conditions. 2. In C. affinis hyperventilation stroke frequencies up to 120/min. were recorded in low pO2, with maximum ventilation oftentimes occurring upon readmission and detection of oxygen-containing sea water. 3. In low-oxygen sea water C. californiensis was clearly able to discriminate between samples of aerated and low-oxygen sea water, as indicated by significantly greater ventilation beginning within a few seconds after detecting the oxygen-containing sea water.

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