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Unit 2 – Natural Disruptions to Ecosystems

Unit 2 – Natural Disruptions to Ecosystems. Topic 2.5 – Natural Disruptions to Ecosystems. Temporal- time Periodic-is occurring at repeated intervals Tides Episodic- occurring occasionally and at irregular intervals. El Nino/La Nina (every 2-7ish years) Random

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Unit 2 – Natural Disruptions to Ecosystems

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  1. Unit 2 –Natural Disruptions to Ecosystems

  2. Topic 2.5 – Natural Disruptions toEcosystems • Temporal-time • Periodic-is occurring atrepeated intervals • Tides • Episodic- occurring occasionally and at irregularintervals. • El Nino/La Nina (every 2-7ishyears) • Random • Meteoriteimpacts • Spatial-space

  3. Earth’s climate has changed over geological time for manyreasons. • Causes in historic ice ages: changes in ocean and atmosphere circulation patterns, varying concentrations of atmosphericcarbon dioxide, and even volcaniceruptions

  4. The K-T Extinctionevent • Asteroid changed Earth’sclimate Sixty-five million years ago, more than three-fourths of all plant and animal species living on Earth became extinct. This event is known as the K/T mass extinction.

  5. You don’t need toknow • specifics (takehistorical • geology in college forfun!)… butthinkaboutit,whydoes the USA have coal in the Appalachians? Because the climate used to bevery • different…..

  6. Sea level has varied significantly as a result of changes in the amount of glacial ice on Earth over geologicaltime.

  7. Major environmental change or upheaval commonly results inlarge swathes of habitatchanges. • Forests farmland • Forests housing

  8. Habitat destructionoccurs when natural habitats are no longer able to support the species present, resulting in the displacement or destruction of its biodiversity. Examples include harvesting fossil fuels, deforestation,dredging rivers, bottom trawling, urbanization, filling in wetlands and mowing fields.

  9. Wildlife engages in both short- and long-term migration for a variety of reasons, includingnatural disruptions. How doesthis impact fish management policies?

  10. Fly fromCanada/USA to spend the winter in Mexico. (migrate as far as 3,000miles) • Winter home = Mexico (arrivein November) • The monarchs hang in trees in Mexico for the winter. Theforest sheltersthem. • Leave Mexico inthe spring. (Migration begins inMarch). Monarch caterpillars eat and live on, and eat,milkweed. • Habitatremoval? • Land usechange?

  11. Classroom Activity • In your group, analyze your natural disruption. • Describe your natural disruption. • What are some of the effects on that ecosystem’s stability? • How are living organisms effected? (plants, animals, humans) • How would the food chain be impacted? Positively or negatively? • Would we see a change in habitat? Why or why not? • Are natural disasters beneficial or harmful?

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