Presentation on theme: "“The first animal species to go are the big, the slow, the tasty, and those with valuable parts such as tusks and skins.” E.O. Wilson."— Presentation transcript:
1 “The first animal species to go are the big, the slow, the tasty, and those with valuable parts such as tusks and skins.” E.O. Wilson
2 Endangered and Extinct Species Sustaining Biodiversity
3 Species ExtinctionLocal extinction: when a species is no longer found in an area it once inhabited but is still found elsewhere in the world.Ecological extinction: when so few members survive that the species no longer play its ecological role in their communities.Biological extinction: when a species is no longer found on earth. This is forever.
4 Not yet extinct…Vulnerable or threatened species: still abundant in its natural range but because of declining numbers is likely to become endangered.Endangered species: has so few individual survivors that the species could soon become extinct over all or most of it natural range.
5 The Sixth ExtinctionBackground extinction rate: one species per million per year, or %Conservative estimate on current extinction rate: 1,000 to 10,000 species per million per year, or 0.1% to 1%If there are currently around 7 million species, how long would it take to lose half of them?
8 OK, soooo, what’s the big deal? Rebuilding biodiversity takes a long time.Economic value of species (instrumental value).Recreational use (eco-tourism).Intrinsic value.
9 Extinction Threats Habitat loss Greatest threat to wild species Islands species are at greatest riskDeforestationDestruction of wetlandsPlowing of grasslandsAgricultureCommercial developmentWater developmentOutdoor recreation (off-road vehicles)Livestock grazingpollutionWater Development
10 Extinction Threats Habitat Fragmentation Large, continuous area of habitat is reduced, divided, scattered, or isolated.Species at special risk…RareNeed to roam unhinderedLow reproductive capacitySpecialize nichesDivides species into smaller groups which make them more vulnerable.Invasion of competitive speciesPredatorsDiseaseStorms or firesBarriers for dispersal and gene flow
11 Extinction Threats Poaching and Hunting Two-third of animals illegally smuggled around the world die in transit.Poverty is a contributing factor.China: world’s largest consumer of wildlifeBushmeat
12 Extinction Threats Predator Control Exterminate species that compete with us for food and game animals.Legal and illegal trade for exotic pets and plantsClimate change and pollutionSpecies can not adapt fast enough
13 Do you think these can be effective? Why or why not? Is there any hope?There are treaties and laws in place both nationally and internationally that try to protect and conserve endangered species:1975 Convention on International Trade in Endangered Species (CITES)Convention on Biological Diversity (CBD)Do you think these can be effective? Why or why not?