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When conditions become outside of their range of tolerance, they migrate to another area.
Science of Curiosity Unit 2 - The Living World: Biodiversity TOPIC 2.5 Natural Disruptions to Ecosystems ENDURING UNDERSTANDING ERT-2 Ecosystems have structure and diversity that change over time. LEARNING OBJECTIVE ERT-2.G Explain how natural disruptions, both short and long-term, impact an ecosystem.
Name at least three natural disasters or environmental disruptions to ecosystems that fall under each category. Consider both long term (decades, centuries) and short term (seasonal). ESSENTIAL KNOWLEDGE ERT-2.G.1 Natural disruptions to ecosystems have environmental consequences that may, for a given occurrence, be as great as, or greater than, many human-made disruptions. ERT-2.G.2 Earth system processes operate on a range of scales in terms of time. Processes can be periodic, episodic or random. ERT-2.G.3 Earth’s climate has changed over geological time for many reasons. ERT-2.G.4 Sea level has varied significantly as a result of changes in the amount of glacial ice on Earth over geological time. ERT-2.G.5 Major environmental change or upheaval commonly results in large swathes of habitat changes. ERT-2.G.6 Wildlife engages in both short and long-term migration for a variety of reasons, including natural disruptions Periodic Disruptions: disruptions that occur in regular cycles Seasons (winter to summer) El Nino and El Ninia Ice ages (climate change) Sunspot cycle Earth’s Climate has Changed Over Time Use a blue colored pencil to trace out the extent of the ice sheets that covered the Northern and Southern Hemispheres at the the peak of the Last Glacial Maximum (around 21,500 years ago). Use a green colored pencil to trace the extent of ice covering the poles today. Episodic Disruptions: disruptions that occur at irregular intervals wildfires drought floods tsunami hurricanes earthquakes volcanoes meteor impacts tornadoes Science of Curiosity There are many running theories for what causes, and what ends ice ages. Briefly describe two natural fluctuations of Earth’s systems that may be driving ice ages. Answers will vary - The earth's tilt changes, leading to less sunlight The earth's orbit changes, leading to less sunlight Solar cycles that lead to less sunlight Feedback - more ice reflects more sun, leading to a positive feedback loop of increasing ice lower rise During ice ages, the sea level is ____________________. When an ice age ends, and glacial ice melts, the sea levels ________.
Name a type of natural disruption that would lead to short term migration of the organisms in that habitat. Explain why it would be short term migration. Answers will vary - any type of natural disaster would be short term, the ecosystem would recover eventually and organisms would return.