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Fig. 8. Responses in internal oxygen partial pressure (PO2) and heart rate (fH, open squares) of differently sized (small, medium, large: 1.5±0.12, 2.5±0.3, 3.3±0.13 mm) Hb-poor and Hb-rich Daphnia magna to decreasing ambient oxygen partial pressures (PO2amb). The haemolymph PO2 is given for the carapace lacuna (loading PO2, open circles), the dorsal lacuna (open diamonds), the heart region (open triangles), and the central body region (unloading PO2, closed triangles). The dotted lines represent lines of identity where PO2=PO2amb.





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