Besides predators, there are other living organisms in an ecosystem that interact with a population that can cause natural selection to occur. brainstorm a list of some of the other organisms in an ecosystem that might contribute to natural selection through their interactions with a bug population

Interspecific competition can occur between two different species competing for the same resource in an ecosystem. So for this particular bug population, there may be another insect species that competes for the same food source or another resource, such as material or space for breeding habitat. This can lead to selective pressure, and may result in the different species evolving a more specific diet or inhabiting a niche environment.