12 Jun The gray squirrel (Sciurus carolinensis) is a species common
Question
The gray squirrel (Sciurus carolinensis) is a species common in eastern North America. Most individual squirrels of the species are indeed gray, but in northern populations there are a number of squirrels that are all black. When the pioneers settled northern Wisconsin, a large proportion of the species population were black. By the early 1900s, due to hunting, the gray squirrel population was very low and black gray squirrels were extremely rare, probably under 1% of the population. Hunting regulations were passed that limited the shooting of gray squirrels. The gray squirrel population recovered and the percentage of black gray squirrels has again increased in northern populations. (About 30% black in my northern Wisconsin squirrel research.) Briefly try to explain this increase in percentage of black gray squirrels in terms of natural selection. Include in your answer these components of natural selection – overproduction, variation, competition & survival, differential reproduction.
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