Question

if the impala population decreases, what would happen to the oxpecker population? if the triggerfish population increases, what would happen to the small - fish population? increase decrease not affected

Explanation:

First Question (Impala and Oxpecker):

Oxpeckers often have a symbiotic (mutualistic) relationship with impalas, where oxpeckers feed on parasites on impalas. If the impala population decreases, the available hosts (impalas) for oxpeckers decrease, so the oxpecker population would likely decrease due to less food/resource availability from impalas.

Triggerfish are likely predators of small - fish. If the triggerfish population increases, there will be more predators feeding on small - fish. So the small - fish population would decrease as more of them are preyed upon by the increased number of triggerfish.

Answer:

decrease

Second Question (Triggerfish and Small - fish):