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Chapter 10: Biodiversity Mr. Manskopf Notes also are at http://www.manskopf.com Chapter 10 Biodiversity Big Ideas There is a huge diversity of life on Earth that is critical to all species. . There are some factors about species that make them prone to extinction. Human activities are causing large numbers of species to go extinct. Section 1: What is biodiversity? How many species live on Earth? Describe the types of biodiversity. Explain why biodiversity is important. Terms: biodiversity, genes, keystone species, ecotourism • About 1.7 million species are known •Estimates vary from greater than 10 million •Why so many unknown? Biodiversity Which species rule the world? Biodiversity Biodiversity: the number of different species in a given area Tropical rain forests What factors lead to biodiversity? Types of Biodiversity Species Biodiversity: number of different species in an area Ecosystem Diversity how many types of habitats in an area Genetic Diversity the number of genes in all members of a population Ecosystem diversity often leads to species diversity and often genetic diversity What is a gene? Gene: a piece of DNA code for a specific trait inherited Tall, short, brown eyes, etc. Genetic Diversity among corn Why is genetic diversity important? Cavendish banana “ The fungus Fusarium oxysporum wiped out the previous species of bananas (the Gros Michel) in the 1950s. Now it’s back, having evolved to be able to take on the previously resistant “back-up” species of banana — the Cavendish — that replaced the superior Gros Michel banana after it was wiped out. “ Benefits of Diversity Keystone Species: species that is critical to ecosystem survival Sea otter Grey Wolf Beaver Keystone Species Food Web Depends Upon Krill Benefits of Diversity Genetic Diversity Key To Survival small isolated populations unlikely to survive Genetic mutations from inbreeding can occur More diversity = more likely to survive Benefits of Diversity See table 1 pages 261 Medical, Industrial, Agricultural uses Food, cloths, shelter, chemicals and medicine often comes from variety of organisms Benefits of Biodiversity Ethics, Aesthetics and Recreation Moral, religious purposes for all species Personal enjoyment Dolphin Tour Off NJ Beaches Benefits of Biodiversity Ecotourism: tourisms that supports conservation Wildlife, birding, wilderness hiking People make $ by having people view wildlife Section 1 Review How many species live on Earth? Describe the types of biodiversity. Explain why biodiversity is important. Terms: biodiversity, genes, keystone species, ecotourism Section 2: Biodiversity at Risk What does it mean when a species is threatened or endangered? What makes some species more prone to extinction? What are the largest threats to biodiversity? What areas are likely to have high biodiversity? Terms: endangered species, threatened species, exotic species, endemic species, poaching Biodiversity has increased over time, but mass extinctions are also natural events (5 major events) How do we get this data? Extinctions Species gone forever NORMAL Mass Extinction: short period of time when large number of species go extinct (65 MYA) Currently in mass extinction…caused by humans Rapid climate change Extinctions Certain traits make some species more vulnerable: Small populations Specialized Need large range Migration Valuable to humans Species squeezed into smaller and smaller fragmented habitat Current Extinctions Endangered Species: is likely to go extinct if actions not taken Threatened: population declining and likely to become endangered Current Extinctions TNC estimates 1/3rd of 21,000 identified U.S. animal and plant species are vulnerable. 30,000 of the world’s species and 1,200 in U.S. are officially endangered. Types of endangered species worldwide How do humans cause extinctions? “HIPPO” Habitat destruction Invasive species Population (humans) growth Pollution Overharvesting Habitat Loss/Fragmentation Humans Causing Extinctions Habitat Destruction causes 75% maybe Large creatures need lot of land Invasive Species: exotic species not native to area can destroy an ecosystem Invasive Species Invasive Species CA Agricultural Checkpoints Humans Causing Extinction Over-harvesting excessive hunting (bison in U.S.) Poaching: illegal hunting Common in poor countries for food, medicines, income Pollution air, water, land Areas of Critical Biodiversity Hotspots: areas threatened that contain high biodiversity Roughly 25 worldwide Madagascar Parts of California Hotspots Large numbers of endemic species: species native to that area US Hotspots Areas of Critical Biodiversity Tropical Rain Forests Coral Reefs Coastal Ecosystems Islands Why these areas???? Section 2 Review What does it mean when a species is threatened or endangered? What makes some species more prone to extinction? What are the largest threats to biodiversity? What areas are likely to have high biodiversity? Terms: endangered species, threatened species, exotic species, endemic species, poaching Section 3: Future of Biodiversity List and describe efforts to save individual species. Explain the advantages of protecting entire ecosystems rather than individual species. Describe the main parts of the Endangered Species Act. Terms: Endangered Species Act, habitat conservation plans, CITES Saving Individual Species Captive Breeding Programs: breeding species in captivity with hopes of reintroducing into native habitats Germ Plasm: saving genetic material for possible future use (seeds, eggs, DNA) Zoos and Aquariums Saving Individual Species Does little to preserve species Captive individuals may not survive in wild Small populations have difficult time with inbreeding, diseases Last resorts Preserving Habitat and Ecosystems Most effective way to save a species is protect its habitat. Some species require large areas What about when they leave protected areas? (Wolves in Yellowstone Legal Protections Many countries have laws to protect wildlife Some weak some strong U.S. law Endangered Species Act (ESA) ESA Endangered Species Act Passed 1973 Protect plant and animals in danger of extinction List created of those threatened and endangered Currently 1,272 listed Some listed species include ESA Spotted Owl Protects listed species from harm No development that harms listed species What does that all mean? Can a Shopping Mall be built where listed species lives? ESA Species recovery plan must be made Habitat Conservation Plans: plans to protect species habitat Why do you think ESA may be controversial? Who would not like this law? ESA: 1973-2004: 92 to 1,272 species listed ESA 37 Species removed (14 recovery, 8 extinctions, rest discovered more) 60% plants, 40% animals TNC says 1/3rd of all U.S. species…30,000 not 1,260 Internationally CITES (Convention on International Trade of Endangered Species) illegal to trade endangered species Ivory Tusks Internationally Much more difficult among may poorer countries International treaties hard to ratify, verify Oceans of particular concern http://animal.discove ry.com/tv/whalewars/ Section 3 Review List and describe efforts to save individual species. Explain the advantages of protecting entire ecosystems rather than individual species. Describe the main parts of the Endangered Species Act. Terms: Endangered Species Act, habitat conservation plans, CITES Chapter 10 Biodiversity Review There is a huge diversity of life on Earth that is critical to all species. . There are some factors about species that make them prone to extinction. Human activities are causing large numbers of species to go extinct.
