During the 1940s, military ships from the South Pacificaccidentally introduced brown tree snakes from Australia to theisland of Guam. These snakes eat birds, lizards, and small mammalsin their native range of Australia. Since no species on Guam eatsthe snakes, their population has grown rapidly. Researchersestimate that two million tree snakes now inhabit the island. Sofar, 10 species of birds and 5 species of lizards have disappearedfrom Guam; small mammals have also decreased inabundance.

Use this information and your knowledge about biology toanswer questions 1 – 5

1. Since the brown tree snake is a keystone species inGuam, it must also be a keystone species in Australia. True orfalse?

2. Native predators of birds on Guam likely decreased inabundance after brown tree snakes arrived. True orfalse?

3. If birds on Guam usually disperse seeds, brown treesnakes likely had a negative indirect effect on plants. True orfalse?  

4. Since more prey and fewer predators occur on Guamthan in Australia, the density of brown tree snakes in Guam likelyexceeds the density in Australia. True or false?

5. If some species of the now-extinct lizards used toeat bird eggs, brown tree snakes had a positive direct effect and anegative indirect effect on birds. True or false?

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