chapter 10 section 2
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Chapter 10 Section 2. Biodiversity at Risk. Objectives. 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 having the largest impact on biodiversity - PowerPoint PPT PresentationTRANSCRIPT
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Biodiversity at Risk
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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 having 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 US to that of the rest of the world
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Rate of extinction is estimated to have increased by a multiple of 50 since 1800
Humans are primary cause of the extinctions
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Species with small populations in limited areas can easily become extinct Those that migrate, need
large or special habitats, those exploited by humans
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Endangered species: species that is likely to become extinct if protective measures are not taken immediately
Threatened species: species that has declining population and likely to become endangered if it is not protected
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Human population growth has accelerated and so has the rate of extinction
Major causes of extinction are destruction of habitats, introduction of nonnative species, pollution, and overharvesting of species
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Habitat Destruction and FragmentationAs human population grows, use more land
to build homes and harvest resources
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Invasive Exotic SpeciesExotic species: species that is not native
to a particular region Exotic species can threaten native species
that have no natural defenses against them
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Harvesting, Hunting, PoachingExcessive harvesting and hunting of species
can lead to extinction Poaching: illegal hunting, harvesting, and
trade of wildlife
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PollutionPesticides, cleaning agents, drugs, and
other chemicals used by humans are making their way into food webs around the globe
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Endemic species: species that are native to and found only within a limited area Large amounts =
biodiversity
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Tropical Rain Forest
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Coral Reefs and Coastal Estuaries
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Islands
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Biodiversity hotspots: the most threatened areas of high species diversity on Earth