The population of beetle will stay the same if the resource stay constant do not show any effect on the population.
What do you mean by population of a species ?
A population is nothing but a cluster of individuals of the same species reside in a same geographic location and interbreed with each other.
Age structure, sex ratio, the rates of reproduction and death are some demographic structure of a population.
The demographic structure of a population is needed to understand the cause of increase or decrease of a population over time, the changes in species with respect to their environmental and how the trait of a species evolve.
For the determination of ecological dynamics of populations resource availability is one determinant, where fluctuations in resource availability can either increase or decrease the intensity of competition for resource which lead to an evolutionary changes in traits.
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