Catalyst: August 28th , 2014

You need your ActivExpression!

Prepare for our Carrying Capacity quiz!

Have your DBA #2 on your desk!

Agenda

Catalyst (10 minutes) Biodiversity and Change PowerPoint (10

minutes) Biodiversity Whiteboards(15 minutes)

Homework: HP 9/26

Announcements

Biodiversity quiz on Monday

Objectives

SWBAT define biodiversity SWBAT predict the impact of various environmental changes based on the

amount of biodiversity in an ecosystem SWBAT establish a relationship between the amount of biodiversity in an

ecosystem and the likelihood of extinction of a species in that ecosystem

SWBAT describe invasive species and their impact on an ecosystem’s biodiversity.

SWBAT define and describe extinction.

SWBAT predict the effects of certain environmental factors on an ecosystem’s biodiversity.

Biodiversity and Change

Biodiversity is…

Biodiversity is a measure of how many different species live in an ecosystem.

High vs. Low Biodiversity

Ecosystems with high biodiversity have many different species of organisms.

Ecosystems with low biodiversity do not have many different species of organisms.

High Biodiversity

Low Biodiversity

Low or High Biodiversity?

Low or High Biodiversity?

Low or High Biodiversity?

Low or High Biodiversity?

Low or High Biodiversity?

Ecosystem Stability

The higher the biodiversity, the more stable the ecosystem (stable= stays the same) An ecosystem with high biodiversity

does not change easily; it is stable An ecosystem with low biodiversity is

unstableOne small change could cause many species to die

Low Biodiversity

Rabbits eat grass. Foxes eat rabbits

Grass

Rabbit

Foxes

Low Biodiversity

A disturbance hits…A drought happens and kills all the grass.

Grass

Rabbit

Foxes

Low Biodiversity

What happens to the foxes?

Grass

Rabbit

FoxesHow many species do we have left?

0!BIG change?

Higher Biodiversity

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

Grass

Rabbit

Foxes

Chickens

Lettuce

Higher Biodiversity

A disturbance hits…A drought happens and kills all the grass.

Grass

Rabbit

Foxes

Chickens

Lettuce

Higher Biodiversity

What happens to the foxes?

Population size decreases… a little

BIG change?

Grass

Rabbit

Foxes

Chickens

Lettuce

The food web started with high biodiversity

High biodiversity = stable ecosystem One change didn’t have a major impact!

Example: Low vs. High

CFU 1: Which ecosystem has higher biodiversity?

Ecosystem 1 Ecosystem 2

CFU 2: Which ecosystem would be more affected by a disease that

killed all the rats?

Ecosystem 1 Ecosystem 2

CFU 3: Which ecosystem is more stable? Why?

Ecosystem 1 Ecosystem 2

Ecosystem 1 Ecosystem 2

 CFU 4: What might happen to the snakes in Ecosystem 2

if there are not any of that species of snakes anywhere else in the world and most of the rats in the ecosystem

die from disease?

Biodiversity and Extinction

Environmental change in an ecosystem with low biodiversity can even cause extinction of a species Can occur if there are no organisms of that

species in other ecosystems throughout the world

Species with specialized diets (low surrounding biodiversity) and specific habitats are more likely to become extinct than species with diverse diets and a wide range of habitats

Invasive Species

Invasive species are non-native species of organisms in an ecosystem that reproduce quickly and have few natural predators Native= originally from that ecosystem Non-native= originally from somewhere else

Invasive species decrease biodiversity in an ecosystem by taking over food and space from native species Decrease the number of native species

Invasive species are very harmful to ecosystems that already have low biodiversity

Invasive Species

Examples: Zebra mussels Kudzu plant Brown tree snake Wild hogs

CFU 5

  Brown tree snakes are a species of

snakes that were imported to the island of Guam from South America. Brown tree snakes eat many different types of birds and lizards. They reproduce rapidly and have few natural predators. What will most likely happen to the number of native bird and lizard species on Guam over time?

CFU 6

 Does an invasive species normally increase or decrease biodiversity in an ecosystem?

Zebra Mussel Reading and Questions Options for reading:

Whole class Small groups Partners Individually

Catalyst: August 29th, 2014

Introduction to ALA ACT method.

Agenda

Catalyst: 10 minutes Biome Jigsaws: 15 minutes Biome Presentation: 10 minutes

Announcements

DABA #3 due 9/8 LABOR DAY WEEKEND!!!

Objectives

SWBAT analyze the features of major global biomes.

Biomes Jigsaws

7 groups Each group will be assigned a biome reading. You must identify the following factors for

your biomes:

Presentation: After 15 minutes, each group will present major features of their assigned biome. The rest of the class will fill in their graphic organizers accordingly.