Review 10.1

• What is Biodiversity?• 3 levels of biodiversity?• Define Keystone species – otters?• Why is genetic diversity important?• Human uses of organisms?• What is ecotourism?

10.2 Biodiversity at Risk

Unscramble key terms

Extinction

• Extinction has increased since 1800. • Predict b/t 1800 and 2100 25% of all species on

Earth may become extinct.• A species that is likely to become extinct if not

protected is gereddanen __________________.• A species that is declining and likely to become

endangered if not protected is called netedreath_________________________.

How does extinction happen

• Habitat destruction • Invasive species• Hunting• Illegal hunting chpaoing _______________• Pollution

Critical biodiversity

• Ecologists often use the number of native plants as an indicator of overall biodiversity.

• Native plants and animals only found in a limited area are known as demicen___________________.

• Critical areas:• Tropical rain forests• Coral reefs and coastal ecosystems• Islands

Hotspots

• Spotshot___________________are the most threatened areas of high species diversity on Earth.

• US hotspots– Everglades– California coast– Hawaii– Midwest prairies– Pacific Northwest forests.