The American redstart (Setophagaruticilla) is in serious decline. Scientists have been able to correlate health and breeding success to levels of 13C in their blood (a chemical signature indicating the source of their diet). Birds with lower levels of 13C in their blood return to their spring breeding ground sooner, weigh more and produce more offspring. Based on this, what would you expect to find in the wintering grounds of the American redstart? Check all that apply.
A. Higher insect biomass in areas where plants have low13C
B. A lack of territorial behavior being displayed by American redstarts
C. Differences in food quality correlating with levels of 13C in the habitat
D. Similar flora and fauna in all redstart habitats, unrelated to levels of 13C
E. Limited availability of habitat in areas where plants have low13C
Answer: E
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