Use the information below to answer the following questions.
Flycatcher birds that migrate from Africa to Europe feed their nestlings mostly with moth caterpillars. The data presented show the mean dates of egg laying, hatching, and fledging of flycatcher young, and the 1980 and 2000 peak mass of caterpillars.

Figure 55.4
-The most likely cause for the shift in caterpillar peak mass is
A)pesticide use.
B)earlier migration returns of flycatchers.
C)an innate change of biological clock by caterpillars.
D)global warming.
E)a decrease in the amount of calcium in the ecosystem.

Question

Use the information below to answer the following questions.
Flycatcher birds that migrate from Africa to Europe feed their nestlings mostly with moth caterpillars. The data presented show the mean dates of egg laying, hatching, and fledging of flycatcher young, and the 1980 and 2000 peak mass of caterpillars.
  
Figure 55.4
-The most likely cause for the shift in caterpillar peak mass is
A)pesticide use. 
B)earlier migration returns of flycatchers. 
C)an innate change of biological clock by caterpillars. 
D)global warming. 
E)a decrease in the amount of calcium in the ecosystem.

Quizplus · Accepted Answer

Global warming is the most likely cause for the shift in caterpillar peak mass as it can cause changes in the timing of seasonal events, such as the timing of when caterpillars hatch and when they are available as food for birds.

Use the Information Below to Answer the Following Questions