Currently the only predators of Galápagos marine iguanas are Galápagos hawks. Ig

Question

Currently the only predators of Galápagos marine iguanas are Galápagos hawks. Iguana body size is not correlated with risk of hawk predation, although small iguanas can sprint faster than large iguanas. If predators (e.g., cats) that preferably catch and eat slower iguanas are introduced to the island, iguana body size is likely to __________ in the absence of other factors; the iguanas would then be under __________ selection.

1. increase; directional
2. increase; disruptive
3. decrease; directional
4. decrease; stabilizing
5. stay the same; stabilizing

Explanation / Answer

A) the hawks would have trouble flying away with very large, heavy iguanas; so the largest, heaviest iguanas would be left to bred and pass on their large and heavy-ness. also, things on islands tend to get either larger OR smaller.

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