9,000 AM 8,000 7,000 E 6,000 5,000 4,000 3,000 B. 2,000 A 1,000 1960 1965 1970 1975 1980 1985 1990 1995 2000 2005 2010 2015 Estimated Beaver Colonies ----- 20-Year Linear Trend Line (2000 - 2019) Beaver Colonies

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Population Growth

R and K Selection

R and K selection are concepts in ecology used to describe traits in the fluctuation of a population or population dynamics. For example, they describe the life-association traits between parent and offspring, such as quantity or number of young ones born at a time, quality of parental care, the age to maturity, and reproductive effort.