Where did all these species come from Can new species form How do humans effect biodiversity How do we prevent extinction Why is it important to have so many different species in other words what roles do they play in an ecosystem ID: 1040445
Download Presentation The PPT/PDF document "Ecosystem Diversity What is biodiversity..." is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
1. Ecosystem DiversityWhat is biodiversity?Where did all these species come from?Can new species form?How do humans effect biodiversity?How do we prevent extinction?Why is it important to have so many different species? (in other words, what roles do they play in an ecosystem?
2. TuesdayWhat is biodiversity? (p 78-80)Where did all these species come from?(p 80-83)Can new species form?(p 86-87)
3. What is biodiversity?Biodiversity is the variety of the earth’s species, the genes they contain, the ecosystems in which they live and the ecosystem processes such as energy flow that sustain all life.Its super important, really its vital.Just for grins: ID: 1.8 million but think there is 4-100million out there.How we look at biodiversitySpecies diversityEcosystem diversityFunctional diversityGenetic diversity (allows to adapt)
4. Where did all these species come from?Biological Evolution: change over time. (in populations not individuals)Darwin’s theory:Common ancestorNatural selection: most fit organism survives to reproduce.Allows organisms to adapt to their environment.What causes the changes in individuals = mutationsMutation= individuals are selected=populations evolve that are better adapted to the changing environment.
5. Can new species form?Speciation: forming of a new species.Mechanisms for speciation: reproductive isolation or geographic isolation.
6. WednesdayHow do humans effect biodiversity? (pg. 87-89)How do we prevent extinction?Why is it important to have so many different species? (in other words, what roles do they play in an ecosystem?
7. What are the effects humans cause in a species?Extinction vs. Endemic -mass extinction: amphibians?2. Invasive species
8. How do we prevent extinction?1. Conservation (protected areas)2. Insure species diversity: (species richness vs species evenness). species richness: lots of different organisms species evenness: relative abundance of each species.Species richness = sustainability
9. RolesEcological niche: the role of a speciesGeneralist: can live in many different places and eat many different foods? (raccoons, deer, beetles, rats, mice)Specialist: occupy a narrow niche (panda, tiger salamanders)Native species vs. invasive (nonnative, alien, exotic)Indicator species: species that provide early warning signs.Keystone species: have a larger effect on an ecosystem than their numbers would suggest. (alligator or prairie dogs)Foundation species or ecological engineers: plays a major role in shaping communitites by creating and enhancing their habitats.
10. Now that we have looked back over our notes…Speciation: Of Ligers & Men - Crash Course Biology #15 – YouTubeWords you may want to add that are not in your book. ( I don’t have to tell you your book is not the best)Allopatric speciationSympatric speciation
11. Lets get ready for POPULATION ECOLOGY!!!Population EcologyCharacteristicsFactorsGrowth ModelsEstimating PopulationsMeasuring Diversity