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image of Journal of Crustacean Biology

ABSTRACT The effect of oxygen pressure on the swimming activity of hemoglobin-rich (red) and hemoglobin-poor (pale) Ceriodaphnia guadrangula was studied at 25°C. The swimming time of red animals until final cessation of antennal movement was constant (38 min) in extremely low oxygen concentration, rapidly increased, and reached 100 min at 4.5 torr. The swimming time of pale animals was constant (24 min) at 3.5 torr, increased gradually, and reached 100 min at 11.7 torr. The swimming time of red animals in nitrogen-saturated water increased on exposure to 3.5 torr and reached a maximum of 35 min at 5.8 torr. The swimming time of pale animals increased above 10.5 torr and reached a maximum of 23 min at 16.3 torr.


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