The marine shrimp Palaemon adspersus Rathke, frequenting Zostera meadows, shows an oxygen consumption rate (MO2) that is independent of water oxygen tension (PwO2) as PO2 decreases to a critical point (Pcr) near 70 mm Hg. This respiratory independence is associated with maintenance of a relatively constant "arterial" (post-branchial) haemolymph tension (PaO2) at 70-80 mm Hg. At lower PwO2 values, both MO2 and PaO2 fall, reflecting, in contrast to the above independence, a direct dependence of MO2 on internal PO2. Haemolymph copper measurements demonstrate relatively high haemocyanin concentrations and oxygen-carrying capacities, but MO2 levels reflect an insignificant role for the pigment as an oxygen store. The data are discussed as regards adaptations for aerobic metabolism.
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