Use the following graph and information to answer the question below.Flycatcher birds that migrate from Africa to Europe feed their nestlings a diet that is almost exclusively moth caterpillars. The graph below shows the mean dates of arrival, bird hatching, and peak caterpillar season for the years 1980 and 2000.The shift in the peak of caterpillar season is most likely due to _____.

Question

BlackTom AI · Accepted Answer

Begin by examining what the question is asking: the shift in the peak of the caterpillar season between 1980 and 2000.
Option a: earlier migration returns of flycatchers. While migration timing could influence food timing, the question focuses on the caterpillar peak shift itself, not the birds’ arrival, and the graph shows changes in the prey peak timing rather than the birds’ return dates driving the shift.
Option b: pesticide use. Although pesticides can affect insect populations, the presented pattern specifically indicates a shift in timing (earlier or later peak) rather than a change in abundance due to eradication, and pesticides are not shown as the temporal driver in the provided data.
Option c: an innate change in the biological clock of the caterpillars. A change in innate timing could cause shifts, but the question and context point to an environmental factor affecting phenology (timing) rather than an evolved, species-intrinsic clock change in caterpillars across just two decades.
Option d: acid precipitation in Europe. Acid rain has various ecological effects, but it is not the most direct evidence for shifting caterpillar phenology as shown in the comparison of two successive years’ peak timings.
Option e: global warming. The most consistent explanation for an earlier (or shifted) peak caterpillar season across years is climate warming, which tends to advance the timing of insect development and leaf-out, thereby shifting prey availability earlier and altering the predator–prey phenology observed in the graph.
Overall, the data illustrated by the graph align with phenological advances tied to rising temperatures over time, making global warming the most plausible driver of the observed shift in peak caterpillar season.

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