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Figure 2 | BMC Physiology

Figure 2

From: Hypoxia modifies the feeding preferences of Drosophila. Consequences for diet dependent hypoxic survival

Figure 2

Analysis of the feeding data using the nutritional geometrical framework. Flies were exposed to different diets as indicated. The daily intakes of sucrose and yeast are plotted. A. Normoxic conditions. The dotted line shows the relationship that was expected if self selecting flies had a 4 fold greater preference for sucrose over yeast. The continuous line shows the relationship that was imposed by a mixed 1:1 yeast:sucrose diet under "no choice" conditions". The red squares indicate the feeding preferences of self selecting flies (5S-5Y and 10S-10Y diets as indicated). The grey zone indicates the range of sucrose intakes by flies fed on pure sucrose diets (5S or 10S diets). The arrows illustrate how flies adapt to an imbalanced 1:1 sucrose:yeast diet. All flies increased their intake of yeast as evidenced by an upward shift. Flies fed on a 10S10Y diet decreased their intake of sucrose as evidenced by a leftward shift. Flies fed on a 5S5Y diet did not.

B, Hypoxic conditions. The same symbols as in panel A are used. The two panels are drawn at the same scale to favor comparisons. Note that flies fed on pure sucrose diets (5S, 10S) did not modify their intakes in response to hypoxia as evidenced by the relative positions of the grey areas in panels A and B. Hypoxia did not change the response of the flies to imbalanced 1:1 yeast:sucrose diets as documented by the similar orientations of the arrows. Hypoxia only modified the intake targets of self selecting flies (red symbols). Hypoxia induced yeast avoidance is not represented for clarity reasons.

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