Suppose a bacterial infection kills off most of the prey at point B on

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p. 102, Analyzing Data #1, 2, 3
p. 102, Analyzing Data #1, 2, 3
1.
Suppose a bacterial infection kills off
most of the prey at point B on the
graph. How would this affect the
predator and prey growth curves at
point C? At point D?
1. If most of the prey were killed off at
point B, the predator population would
decline between points B and C, allowing
the prey population to increase again by
point C.
2.
Suppose a sudden extended cold spell destroys almost the entire predator
population at point F on the graph. How would the next cycle of the prey
population appear on the graph?
2. The prey population would increase in the next cycle, reaching a peak that
is potentially even higher than the previous peaks.
p. 102, Analyzing Data #1, 2, 3
3.
Suppose a viral infection kills all the prey
at point D on the graph. What effect
would this have on the predator and
prey growth curves at point E? What
will happen in future years to the
predator population? How could
ecologists ensure the continued survival
of the predators in this ecosystem?
3. If a viral infection kills all the prey at point D, at point E, the prey population will
be zero and the predator population would be decreased, possibly to zero. In future
years, if the predators find another food resource, the population may recover. The
predator population would not recover in future years without any prey to feed on.
To ensure continued survival of the predators in this ecosystem, ecologists could
control the viral infection in the prey so that not all of them are killed by the virus,
or they could introduce new prey animals to the ecosystem.

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