Population Ecology

AP Biology· difficulty 3/5

Two species are characterized by the trait sets in the figure.

Species X Species Y Many small offspring Short lifespan Little parental care Early maturity Few large offspring Long lifespan Extensive parental care Late maturity

Which classification fits Species X and Species Y, respectively?

  • A

    X is K-selected; Y is r-selected

  • B

    Both are K-selected

  • C

    X is r-selected; Y is K-selected

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  • D

    Both are r-selected

Explanation

r-selected species have many small offspring, short lives, and little care, favored in unstable environments. K-selected species have few large offspring with extensive care, favored near carrying capacity.

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