Disruptions to Ecosystems

AP Biology· difficulty 4/5

Fertilizer runoff enters a lake; algae and dissolved O2 are tracked over time.

Algae O2 P/N runoff Time

The pattern shown best illustrates which process?

  • A

    Bioaccumulation

  • B

    Niche partitioning

  • C

    Primary succession

  • D

    Eutrophication leading to a hypoxic dead zone

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Explanation

Nutrient enrichment causes an algal bloom; subsequent decomposition consumes O2, producing hypoxic conditions characteristic of cultural eutrophication.

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