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Bio 20 Unit B

Bio 20 Unit B . Section 4.1 Interactions within Ecosystems. To start things off. Let’s see what we know...show me your skills  Complete questions on pg 82 #3( a,b ), 4, 5. Ernst Haeckel (German Biologist) First used the word “ecology” in 1866

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Bio 20 Unit B

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  1. Bio 20 Unit B Section 4.1 Interactions within Ecosystems

  2. To start things off... • Let’s see what we know...show me your skills  • Complete questions on pg 82 #3(a,b), 4, 5

  3. Ernst Haeckel (German Biologist) • First used the word “ecology” in 1866 • Derived from the Greek words “oikos” (meaning a place where one lives) and “logos” (study of) • Ecology- the study of interactions between organisms and their living and non-living organisms • Living = biotic factors • Non-living = abiotic factors

  4. Quick Work Working with your neighbor, create a Biotic vs. Abiotic Table. Place the following objects in the appropriate position in the Table. • Air • Aluminum • Apple seeds • Bread • Clock • Clouds • Corpse • Cotton fabric • Finger nails • Fish • Glass • Gold • Grapes • Hair • Paper • Pipe • Plant • Plastic • Pork chops • rain • Salad • Sand • Snail • Steak • Water • Shale • Wooden ruler • wool

  5. Ecotones and Biodiversity • Ecotones • A transition area between ecosystems • Contain species from both bordering ecosystems • Often has an increase in biodiversity compared to other ecosystems • A predator may have alternative prey if something happens to the population of its main prey • By providing alternative food sources ecotones help guard against extinction

  6. Artificial vs. Natural Ecosystem • Artificial ecosystem • Planned or maintained by humans • Natural ecosystem • Lakes, rivers, forests, deserts, meadows, etc • The living community is free to interact with the physical and chemical environments

  7. Roles in Ecosystems • Every organism has it’s “place” in an ecosystem • Ecological Niche – an organism’s role in an ecosystem, consisting of its place in the food web, its habitat, its breeding area, and the time of day at which it is most active • Species that live in the same area occupy a different niche so that they can live with less competition • Figure 6 – pg 90 • Reading: Examples on pg 90 • What will have a greater biodiversity: a natural forest or a planted forest? Why?

  8. Exotic Species • Exotic species are species that are not native to an ecosystem • Leads to competition • Can happen naturally or artificially • Plant seeds spread by the wind, animals transport themselves • Humans move species throughdiscovery of new land, hulls of ships, etc. • Reading: pg 91

  9. Dangers of Exotic Species • Can cause species depletion, extinction, or habitat loss • Problem: ecosystem lacks predators and disease for exotic species which allows the species population to grow uncontrollably • Native species are unable to compete for space, food, or reproduction sites and may also fall prey to the exotic species • Invasive Species

  10. Assignment Complete Case Study – The Zebra Mussel individually. WARNING: Do NOT plagiarize. Complete this assignment using your own words and not ones from the article or from your friends. This assignment is to be done on your own.

  11. Assignment • Complete questions on pg 93 #1, 2, 3, 4, 5, 7

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