In a grassland food web, which of the following would most likely happen if the population of primary consumers such as rabbits dramatically decreased?
The secondary consumer population would decrease due to reduced food availability.
In a grassland food web, grass (producer) is eaten by rabbits (primary consumers), which are eaten by secondary consumers such as snakes, foxes and hawks.
If rabbits dramatically decrease, the animals that feed on them have less food, so the secondary consumer population falls.
Grass would not decrease – with fewer rabbits there is less grazing, so grass would increase.
Top predators would not increase – less prey at lower levels means less energy reaches them, so they would decline.
Decomposers would not rise for long – fewer consumers means less dead organic matter overall; any short spike from dead rabbits is not the main effect.
Hence, the answer is The secondary consumer population would decrease due to reduced food availability.
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Primary consumers are
