The loss of rabbits would have a significant impact on the fox population.
Without rabbits as a food source, foxes may struggle to find enough prey to sustain their population, leading to a decline in the fox population. This, in turn, could affect other species in the ecosystem that are influenced by the presence or absence of foxes.
The key concept here is that the impact of the loss of a species depends on its position in the food web and the extent to which other species depend on it for food or other ecological interactions. The removal of a species with many ecological connections can have widespread consequences, affecting multiple populations in the ecosystem.