Several things could cause it. A decrease in any predator that feeds on mice will cause an increase in mice population because less of them will be eaten by other animals. An increase in the mice food supply could cause an increase in population too, especially if lack of food was the main limiting factor of the mice population. In very rare circumstances, additional mice could be brought in from other parts of the world by humans. There are some non-native fish living in lakes because someone put some in there and they started to breed.
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An increase in food availability, such as an abundance of seeds or vegetation, can lead to a population increase in mice. Additionally, a decrease in predation or competition can also contribute to a rise in mouse numbers.
there would be less nutrients for the plant.
The increase in pickerel population may lead to a decrease in the population of smaller fish species that the pickerel prey upon. This can create a shift in the ecosystem dynamics, impacting the overall biodiversity of the lake. Additionally, the rise in pickerel numbers could affect the availability of food resources for other top predators in the habitat.
High concentrations of ethanol can cause the yeast population to enter the death phase by disrupting cellular functions and metabolic processes, ultimately leading to cell death.
population, or habitat constrictions
Environmental changes such as availability of resources, changes in predation pressure, or disease outbreaks can affect the carrying capacity of a population by either increasing or decreasing the amount of resources available for the population to survive and reproduce.