Warm Up 4/15

• Finish Hunger Games graphs• Answer these questions on your graph paper:– What did you observe about the population size of

the flat runners after several generations? – What did you observe about the population size of

the high hoppers after several generations? – What 4 factors influenced the population size of

the consumers? • Read pg E 25 about “Natural Selection”

Biodiversity & Species

SWOD: Natural Selection

Biodiversity• The number of different species in an area • Biodiversity = a variety of animals and life

• http://fc01.deviantart.net/fs30/i/2008/077/b/8/Diversity_of_Species___Brushes_by_scumbugg.jpg

The value of biodiversity

• 2 ways:• 1. economic value– Foods, resources,

commodities- Medicines

• 2. ecological value– Food webs

• http://www.biologycorner.com/resources/foodweb1.gif

Concerns with Biodiversity

• Decline in habitatExtinction/endangered species

(extinction = organism is completely gone(endangered = very few species left and could possibly become extinct)Causes: watch video and write down all the

causes of extinction.

Extinction Causes

Causes:1. Habitat destruction (primary cause)2. Poaching3. Pollution4. Exotic species

Thylacine

http://www.fxdirectory.info/wp-content/uploads/2011/03/Baiji-dolphin-is-endangered-habitat.jpg• http://en.wikipedia.org/wiki/File:Pteropus_conspicillatus.jpg• http://www.dodo.blog.br/wp-content/uploads/2007/08/ferahgo.jpg

Exotic Species

Also known as introduced or invasive species- Means: a non – native species that has been

introduced to an ecosystem- Usually results in negative effects to the food

web

Introduced/Exotic species

• Advantages: • Pollination• Food– Butterflies feeding on non-native plants

• Reforestation– Exotic trees restore forest to help bring back

native species• Endangered

Examples of Exotic Species that were harmful

• Zebra Mussel• Kudzu• Nutria Rat• River Monster & Piranas

Zebra Mussels

Disadvantages

• 1. Kudzu: prevent soil erosion• Kudzu video

Nutria Rat