Why are ecologists concerned about the shift in date from May 28 in 1980 to May 15 in 2000 of the caterpillar peak mass?
A) The caterpillars will eat much of the foliage of the trees where flycatchers nest, and their nests will be more open to predation.
B) The earlier hatching of caterpillars will compete with other insect larval forms on which the flycatchers also feed their young.
C) The flycatcher nestlings in 2000 will miss the peak mass of caterpillars and may not be as well fed.
D) The flycatchers will have to migrate sooner to match their brood-rearing season with the time of caterpillar peak mass.
E) Pesticides, which have a negative effect on the ecosystem, will have to be used to control the earlier outbreak of caterpillar hatching.
