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Transcript
Biodiversity Ch 3.5 Ecology and Environment Vocabulary Biodiversity Keystone species Threatened species Vocabulary Habitat destruction Habitat fragmentation Poaching Captive breeding What is biodiversity’s value? • Economic value • Ecological value Economic Value • Plants, animals and other organisms used in: – Food – Clothing – Medicine – Other products • Ecosystems important for tourism Ecological Value • Species depend on one another for a balanced ecosystem • Keystone species – species which many other species in an ecosystem depend upon for survival What factors affect biodiversity? • • • • • • Climate Area Niche Diversity Genetic diversity Extinction Climate • Tropical rainforests – Constant temps – Large amounts of rainfall • Always vegetation and food • Means there are more species Area • Larger areas have more species than smaller ones Niche • An ecosystem that can support more roles or niches has more biodiversity • Example: coral reefs Genetic Diversity • Species with larger gene pools are more likely to survive and adapts Extinction • Disappearance of all members of a species Endangered species – species that is in danger of becoming extinct in the near future Threatened species – species that is in danger of becoming endangered in the near future Golden toad - extinct Giant panda endangered Threatened species – polar bear How do humans affect biodiversity? • Negatively or positively! • Examples? Negative Impacts • • • • • Habitat Destruction Habitat fragmentation Poaching Pollution Introduction of exotic species Positive Impacts • Captive Breeding • Laws and Treaties • Habitat Preservation