Figure 2.7. Two Daphnia magna with contrasting hemolymph color due to haemoglobin (Hb).

Figure 2.7Two Daphnia magna with contrasting hemolymph color due to haemoglobin (Hb).

These two adult females were taken from two adjacent rock pool populations in southern Finland at a time when one of the pools was low in oxygen (because of overfertilization from bird droppings). In the left female, low oxygen triggered the production of Hb, which gives the hemolymph a reddish color. The female on the right was taken from a pool with clear water and apparently normal oxygen levels. The size difference of the animals is attributable to the arbitrary choice of specimens. Both females are carrying embryos in their brood chambers.

From: Chapter 2, Introduction to Daphnia Biology

Cover of Ecology, Epidemiology, and Evolution of Parasitism in Daphnia
Ecology, Epidemiology, and Evolution of Parasitism in Daphnia [Internet].
Ebert D.
Copyright © 2005, Dieter Ebert.

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