Download - Warm Up 4/15
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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”
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Biodiversity & Species
SWOD: Natural Selection
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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
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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
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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.
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Extinction CausesCauses:1. Habitat destruction (primary cause)2. Poaching3. Pollution4. Exotic species
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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
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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
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Introduced/Exotic species
• Advantages: • Pollination• Food– Butterflies feeding on non-native plants
• Reforestation– Exotic trees restore forest to help bring back
native species• Endangered
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Examples of Exotic Species that were harmful
• Zebra Mussel• Kudzu• Nutria Rat• River Monster & Piranas
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Zebra Mussels
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Disadvantages
• 1. Kudzu: prevent soil erosion• Kudzu video
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Nutria Rat