What Is an Example of What Happens When Herbivores Switch

question 55

Multiple Choice

What is an example of what happens when herbivores switch to a new food source with different characteristics?

• A)In southern Florida,the soapberry bug (Jadera haema-toloma)will not have beaks to feed on the seeds of a native plant,the balloon vine (Cardiospermum corindum).
• B)Soapberry bugs in central Florida,where balloon vines have become rare,now have bigger beaks to feed on seeds of the goldenrain tree (Koelreuteria elegans),a species recently introduced from Asia.
• C)Soapberry bugs feed most effectively when the length of their beak is longer than the depth at which seeds are found within the fruit.Goldenrain tree fruit consists of three flat lobes,and its seeds are much closer to the fruit surface than seeds of the plump,round fruit of the native balloon vine.
• D)In populations that feed on goldenrain tree,natural selection results in beaks that are shorter than those in populations that feed on balloon vine.

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