Mount St. Helens Lupine Plant Study
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Questions and Answers

What did Charlie Crisafulli and another ecologist spot as the first plant on Mount St. Helens?

  • A fern plant
  • A daisy flower
  • A cedar tree
  • A lone lupine plant (correct)
  • Why were lupines able to colonize the barren landscape on Mount St. Helens despite the poor nutrient availability in the volcanic ash?

  • Lupines could grow without sunlight
  • Lupines could fix nitrogen, enriching the soil (correct)
  • Lupines could resist extreme temperatures
  • Lupines could absorb nutrients from the volcanic ash
  • What did the lupine plants physically trap, contributing to the enrichment of the soil?

  • Water
  • Windblown debris (correct)
  • Birds
  • Sunlight
  • How did insects contribute to enriching the soil around the lupine plants?

    <p>By dying on or around the plants, enriching the soil with organic matter</p> Signup and view all the answers

    What did Crisafulli learn as one of the key lessons of succession from observing the lupine wildflowers?

    <p>The importance of chance in ecological development</p> Signup and view all the answers

    What was observed to be transported by a log carried downstream in a mudflow to areas devoid of organisms according to Crisafulli's observations?

    <p>Nutrients, microbes, fungi, and small animals</p> Signup and view all the answers

    What term is used to describe the remnants of old landscape that serve as source populations for species to recolonize a disturbed area?

    <p>Biological legacies</p> Signup and view all the answers

    What did scientists at Mount St. Helens discover about the influence of biological legacies on plant and animal communities after the eruption?

    <p>They strongly influence the development of plant and animal communities.</p> Signup and view all the answers

    Why is it now understood to be important to leave some live and dead trees during harvesting in areas affected by disturbances like eruptions?

    <p>To improve soil fertility.</p> Signup and view all the answers

    What is the role of red alder trees in post-eruption succession at Mount St. Helens?

    <p>They fix nitrogen and improve soil fertility.</p> Signup and view all the answers

    What changes have occurred in the vegetation of the blast area 30 years after the eruption?

    <p>Sun-loving early colonizers intermix with late-successional species.</p> Signup and view all the answers

    How long are scientists predicting it will take for the blast area to resemble its pre-eruption state?

    <p>Several hundred years</p> Signup and view all the answers

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