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Selective pressure is evolutionary pressure.The animals evolved due to selective pressure.Selective pressure caused the color to darken.
Predators create a selective pressure on a population. For example, birds that eat insects put a selective pressure on the insects to have better camouflage. Lions that run fast put a selective pressure on their prey to be able to run even faster.Its the same as a selective pressure created by the environment like adaptation to living in a cold environment. Those that can survive the cold the best live. The insects with the best camouflage survive as do the animals that can run the fastest.
The same way all other animals adapt to their environment, through selective pressures, though these might vary between species. Brazil is of continental proportions though, so there is no one environment, ecosystem or niche acting as a selective pressure.
Predators and the alpha-males of whatever species you mean.
drought
When there is low gene flow (apex 10.1.2)
They can go up to 16384049373
When there is low gene flow When there is no selective pressure When there is a bottleneck
acting
Eubacteria
Simply pressure is the force per unit area. So Pressure is directly proportional to the force applied. Hence by increasing the force we can increase the pressure.
The separation of a population, selective pressure, and/or time.