Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Env Sci Mod 6 Ch 8
BioDiversity
| Question | Answer |
|---|---|
| Species Diversity | The number or variety of species in a particular region Ex.): Richness and Evenness |
| Genetic Diversity | Differences in DNA Provides "raw material" for adaptation Inbreeding depression |
| Ecosystem Diversity | The number and variety of ecosystems |
| Biodiversity is unevenly distributed | • Species diversity higher near the equator • 1.8M described Biodiversity enhances food security |
| • Industrial agriculture has narrowed our diet | • 90% of our food comes from 15 crop and 8 livestock species |
| • Many drugs (50%) from wild plants | Cancer treatment, pain, and inflammation meds |
| • Biodiversity helps maintain ecosystem function and increases stability and resilience | Loss of keystone species (ex. top predators) or ecosystem engineers affects the community` |
| • Ecotourism | A vital source of income for many nations |
| Costa Rica | Rainforests |
| Australia | Great Barrier Reef |
| U.S. | National parks |
| Kenya and Tanzania | Savanna wildlife |
| Biophilia | Humans love nature and have an emotional bond with other living things |
| Extirpation (local extinction) | The disappearance of a population from a given area, but not the entire species globally |
| Earth’s mass extinctions | Fossil record reveals 5 50–95% of all species 250 mya 75–95% of species 65 mya |
| Humans appear to be causing the sixth mass extinction event | |
| "Red List" Categories | Mammal Species (25%) Amphibian Species (40%) Shark and Ray Species (31%) |
| In the past 500 yrs | 236 animal and 38 plant species extinct in U.S. |
| Major causes of biodiversity loss | Habitat loss Pollution Over-harvesting Invasive species |
| Habitat Loss | Farming Grazing Clearing forests Dams Urban sprawl |
| Pollution | Air pollution degrade forests Noise and light interfere Heavy metals plastics |
| Over-Harvesting | Species that are long-lived and slow to reproduce |
| Invasive Species | cause biodiversity loss |
| Monarch butterfly populations are declining | industrial agriculture pesticides illegal logging |
| Amphibians | 170+ species extinct since 2000 |
| Endangered Species Act (1973) | Forbids the gov and citizens from destroying endangered or threatened species & habitats |
| • Biomagnification | the concentration of toxins in an organism as a result of its ingesting other plants or animals in which the toxins are more widely disbursed. |
| Biodiversity hotspots | Prioritized geographic regions • Hotspots support high # endemic plants • Example Madagascar |
| International treaties promote conservation | • U.N. Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) |
Created by:
dasiawya311
Popular Science sets