The Island of Guam Traditionally Has Not Had Any Snakes

question 30

Multiple Choice

The island of Guam traditionally has not had any snakes that prey on birds;however,brown tree snakes that prey upon birds were introduced.Use your knowledge of wolf-moose population dynamics to determine what happened to the population dynamics of birds and the new snakes on Guam.Which statement is probably one of the results of the snake introduction?

• A) Because prey was abundant and few predators existed,snakes spread throughout the island.
• B) Snake populations increased exponentially as they preyed upon birds that had no defenses against the predators.
• C) As snake populations became very large,they reached the carrying capacity of Guam and caused bird populations to crash.
• D) Because bird populations crashed,one of the birds' main prey items,spiders,increased their population size.
• E) All of these happened.

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