Catalyst: August 28 th, 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?

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 unstable One 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 Foxes How 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 29 th, 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.