Biodiversity and ecosystem stability
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Biodiversity and Ecosystem Stability. Where does all energy in the food web begin? Name the producer Name two primary consumers. What would happen to the population size of bluebirds if the snails were wiped out by a disease?. Objectives. By the end of today, all SWBAT…

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Biodiversity and Ecosystem Stability

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Biodiversity and ecosystem stability

Biodiversity and Ecosystem Stability

Where does all energy in the food web begin?

Name the producer

Name two primary consumers.

What would happen to the population size of bluebirds if the snails were wiped out by a disease?


Objectives

Objectives

By the end of today, all SWBAT…

  • Explain why biodiversity is essential to the survival of organisms using food web models


Agenda

Agenda

  • Catalyst Review

  • Homework Review

  • What is biodiversity?

  • Ecosystem stability

  • Stations

  • Exit Question


Homework review

Homework Review


Biodiversity definition

Biodiversity Definition

Biodiversity = number of different species that live in an ecosystem

  • Low biodiversity: few species

  • High: many species


Low biodiversity

Low Biodiversity


High biodiversity

High Biodiversity


Low or high biodiversity

Low or High Biodiversity?


Biodiversity and ecosystem stability

Low or High Biodiversity?


Biodiversity and ecosystem stability

Low or High Biodiversity?


Biodiversity and ecosystem stability

Low or High Biodiversity?


Biodiversity and ecosystem stability

Low or High Biodiversity?


Benefits of biodiversity

Benefits of Biodiversity

  • Key Point #1: There are three main benefits to biodiversity

    • Many people find nature beautiful

    • Provides medicines—many plants contain treatments/cures for illnesses

    • Preserves ecosystem stability


Ecosystem stability what that is

Ecosystem stability… What that is!?

  • Stable = things stay the same

  • Key Point #2: High biodiversity = stable ecosystem, low biodiversity = unstable ecosystem

    • If an ecosystem is unstable, one small change could cause many species to die

    • If an ecosystem is stable, it does not change easily


This food web has low biodiversity

This food web has low biodiversity

Rabbits eat grass. Foxes eat rabbits

Foxes

Rabbit

Grass


This food web has low biodiversity1

This food web has low biodiversity

  • A disturbance hits…

    A drought happens and kills all the grass.

Foxes

Rabbit

Grass


This food web has low biodiversity2

This food web has low biodiversity

  • What happens to the foxes?

Foxes

How many species do we have left?

0!

Rabbit

BIG change?

Grass


This food web has high biodiversity

This food web has high biodiversity

Let’s add a few more species to our original ecosystem

Foxes

Lettuce

Rabbit

Chickens

Grass


This food web has high biodiversity1

This food web has high biodiversity

  • A disturbance hits…

    A drought happens and kills all the grass.

Foxes

Lettuce

Rabbit

Chickens

Grass


This food web has high biodiversity2

This food web has high biodiversity

  • The food web started with high biodiversity

  • High biodiversity = stable ecosystem

  • One change… didn’t really do anything!

  • What happens to the foxes?

Population size decreases… a little

Foxes

Lettuce

Rabbit

BIG change?

Chickens

Grass


Comparing multiple ecosystems

Comparing Multiple Ecosystems

  • Key Point #3: If we have two ecosystems, the one that CHANGES LESS is the one with HIGHER BIODIVERSITY

    • Mr. J shoots all the bears in two forests. In the first forest, everything dies as a result. In the second forest, a couple animals die, but things remain mostly the same.

    • Which has higher biodiversity?

    • Which is more stable?


Stations gp

Stations (GP)

  • Designed to get you moving, and practice understanding some of what we’ve been talking about

    • 6 stations

    • Each asks you to complete something

    • THINK. About what you’re reading and what you’re drawing. Really. Think.

    • Work hard. Talk when you’re finished, not before.


Stations review gp

Stations Review (GP)

  • Any questions?


Closing

Closing

  • There are three primary benefits to biodiversity

    • Beautiful, medicines, ecosystem stability

  • An ecosystem is stable if it does not change easily when disturbed

    • “Change” = number of species that live there

  • We can figure out which of two ecosystems has higher biodiversity based on how stable each one is

    • More stable = higher biodiversity

    • Less stable = lower biodiversity


Exit questions answer all

Read the passage at right to answer the questions below:

How does trawling affect coral reef biodiversity?

Would the coral reef be more or less stable after trawling? Explain why, and be SPECIFIC.

(Hint: describe what happens to all the organisms in the coral reef ecosystem, and use the word “biodiversity.”)

Many organisms live in coral reefs, such as plankton and algae, hundreds of species of fish, sea urchins, and eels. All of these organisms depend on the coral to survive: they live inside of it, use it for shelter, eat it, etc.

Trawling is the process of dragging a gigantic rake across the bottom of the ocean floor to scoop up organisms. This is a very good way to catch fish, but has the unfortunate side effect of destroying nearly all the coral in the trawler’s path.

Exit Questions: Answer ALL


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