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Fig. 6. Two-dimensional distributions of oxygen partial pressure
(PO2) in the haemolymph of a 1.4 mm Hb-poor
(top) and a 1.7 mm Hb-rich Daphnia magna (bottom), respectively,
under different ambient oxygen partial pressures
(PO2amb). The
PO2amb values are indicated below each gallery.
Note the different scaling of PO2 in the
pseudo-colour images as indicated by the colour bars at the top. During image
acquisition, the optical focus was set to the median plane of the animal. For
orientation, an image of the animal taken under transmission illumination is
shown at the left side of each gallery.