Notes 14 - Lecture (Week 2) Biodiversity: All forms of...

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Lecture (Week 2) Biodiversity: All forms of life, all levels of organization of living things (i.e. species, populations, communities), interactions among forms of life and levels of organizations Species numbers increase with proximity to equator, and rainfall -Therefore, tropical rainforest is peak of species richness Larger areas hold more species, small islands hold less Endemism: An endemic species ((found nowhere else) Human activities that threaten biodiversity a. Habitat loss b. Over-exploitation of species c. Invasive species (not native to the ecosystem) a. I.e. Cane Toads in Australia d. Pollution Species - Estimated 8 million species on planet, 80 percent of terrestrial unknown and more than 90 percent marine unknown -Tropical Rainforest hosts 50 percent -Mass extinctions rose after humans Biome : Global-scale biogeographic regions, distinguished by unique collection of ecosystem and species assemblage Ecoregion: (Smaller than biome): An area that contains a geographically distinct assemblage of natural communities that a. Share majority of their species and ecological dynamics b. Share similar environmental conditions c. Interact ecologically in ways that are critical for their long term persistence
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Notes 14 - Lecture (Week 2) Biodiversity: All forms of...

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