COMPARATIVE RED-BLOOD-CELL METABOLISM IN 3 WALLABY SPECIES, MACROPUS-EUGENII, MACROPUS-PARMA AND THYLOGALE-THETIS (MACROPODIDAE, MARSUPIALIA)

1. Aspects of red blood cell metabolism were compared among three species of small macropodid marsupials from different habitats. 2. Packed cell volume (PCV), erythrocyte reduced glutathione (GSH) concentration and GSH regeneration rates were similar in all three species. 3. The Parma wallaby had very low red cell potassium levels compared to the other species studied. 4. The Tammar wallaby had higher rates of glucose consumption and lactate production in vitro at both pH 7.4 and 8.2 than did the Parma and significantly lower adenosine triphosphate (ATP) levels than the other species. 6. These findings are consistent with preliminary reports published previously. The differences noted cannot be directly related to differences in the habitats of the species.