Transcript Chapter 10
Chapter 10 BIODIVERSITY: the number of different species in an identified area. 10.1: What is Biodiversity? (AV!) Describe the diversity of species types on Earth, relating the differences between known numbers and estimated numbers List and describe three levels of biodiversity Explain four ways in which biodiversity is important to ecosystems and humans Analyze the potential value of a single species **Think about the monarch butterfly article as well as sea otters in the text To Know or Not to Know??? • Importance: understanding and preservation of different species…for our own survival! • Cataloging all known species: >10 million different species – greatest # = …? – fewest # = …? • Known: collected and significantly described; named. • Unknown: estimated; exist in remote wildernesses, deep in the oceans (extremely unexplored), and even in cities! 3 Levels 1. Species diversity: # of different sp. in an area; “biodiversity” 2. Ecosystem diversity: the variety of habitats, communities, and ecological processes w/i and btwn. ecosystems 3. Genetic diversity: all the different genes contained w/i all members of a population. --gene: piece of DNA, codes for a trait, heritable. Ways in Which Biodidersity is Impt. 1. Health of ecosystems; species are all a part of the biogeochemical cycles; inter-/intradependence of species; food webs --keystone species: species that are critical to the stability of an entire ecosystem; ex. Sea otters (sea otters down due to hunting/fur trade, sea urchins up due to loss of predator, loss of sea kelp…base of the food web!!!) 2. Survival of species and populations -- > genetic diversity = increased chance that some members within a population will survive --bottleneck image pg. 261 3. Ethics, Aesthetics, and Recreation --conservationists, environmentalists, PETA, etc. --ecotourism, $$ --natural beauty! 4. Medical, Industrial, Agricultural uses --1/4 of the drugs prescribed within the US are plant derived. --nearly all antibiotics are derived from chemicals found in fungi --the scientific community continues to find new uses for biological material (products!) --FOOD!! HW…due tomorrow!!! • 10.2 and 10.3 study guide questions answered • Submit online/email: [email protected] 10-2: Define and give examples of endangered and threatened species Describe several ways that species are being threatened with extinction globally Explain which types of threats are have the largest impact on biodiversity List areas of the world that have high levels of biodiversity and many threats to species Compare the amount of biodiversity in the United States to that of the rest of the world 10-3: List and describe the four types of efforts to save individual species Explain the advantages of protecting entire ecosystems rather than individual species Describe the main provisions of the Endangered Species Act Discuss ways in which efforts to protect endangered species can lead to controversy Describe three examples of world-wide efforts to prevent extinction