Number of rotifers 4500+ 4000- 3500 3000- 2500- 2000- 1500- 1000- 500- 0 Key x Rotifers alone (flask X) • Rotifers when living with water fleas (flask Z) 2 0 2 X -+ 4 Yo * X X X 6 8 10 12 14 16 18 Day Analyze the graph and identify some factors that may contribute to the rotifer population leveling off in the absence of water fleas. Explain your answer in 1-2 sentences.

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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.