The North American maggot fly diverged into two species because some individuals fed on apples rather than hawthorn trees. Apple fruit mature more quickly than hawthorn fruit, therefore maggot flies that fed on apples also developed more quickly. Pea aphids can feed on alfalfa or red clover; some aphids have higher fitness when eating clover others when eating alfalfa. Host preference can eventually lead to speciation because

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Host preference can lead to speciation through genetic differences as populations adapt to their specific hosts, differences in fitness depending on the host, and temporal isolation, especially if the life cycles of the organisms become synchronized with the phenology of their preferred hosts, as seen in the example of the maggot fly.

The North American Maggot Fly Diverged into Two Species Because