Our poster is about the three toed sloth population. They are currently Endangered in the wild with below 500 still living in the wild.
Since this species is so endangered, if there was emigration in this population, then that would put another gap in their numbers since they are strewn out, and can't mate with each other. Another way that could backfire is that the ones that left might be killed by some sort of predator and then they wouldn't even have a chance to mate.
There is also immigration, which might actually be beneficial to such a population. If there was another population that came in, they could potentially begin interbreeding and that could potentially inherit their traits, creating more. But there is also the possibility that they will die out because the trait for their toes might become masked by another trait.
If the population goes through an extreme spur in births, then that would mean there are more offspring to carry on the traits for generations. But there is more of a chance of inbreeding between offspring, which is never good.
There is also the fact that everything dies. So that means that eventually, if there aren't enough babies coming out, then the population will die off. IF the population experiences more deaths than births, even with a 2:1 ratio, it will plummet.
If there are limited resources in the environment, that could help, or destroy a population. With our herbivore sloths, they rely on the leaves of the trees. If there are plenty of leaves, then the species will thrive, and produce sufficient offspring. they might even reach their carrying capacity. The carrying capacity is the max amount of a species that can live in an area due to the amount of resources available. Like there are a certain number of trees for the sloths, but more that plenty of leaves, so they will cap out their population to match the environment.
Lets go into the density dependent factor to an environment. That means that the environment is shaped by the species acting on it, so if the sloths are eating all the leaves, then some of the lets say local mouse population will have to compete with them somehow in order to get the food they need. Or if all these sloths group up together in a small spot, and one happened to be sick, it would spread the plague to the rest of them, and starting a line of disease.
Now lets look at the Independent version of that, where the environment determines the population. An example would be like if there is little rainfall, and the trees start to dry out, and die. The sloths wont have any food to eat, and their numbers will drop. There could also be the flip where there is too much rainfall, and it causes floods. If that were to happen, it would drown the trees, and they will die, or if it's a bad storm, destroy some of them.