unit 16b biodiversity and conservation

16.4 Threats To Biodiversity

KEY CONCEPT The impact of a growing human population threatens biodiversity.

16.4 Threats To Biodiversity

Preserving biodiversity is important to the future of the biosphere.

• The loss of biodiversity has long-term effects.– loss of medical and technological advances. How?– extinction of species– loss of ecosystem stability

16.4 Threats To Biodiversity

Loss of habitat eliminates species.

• Habitat fragmentation prevents an organism from accessing its entire home range.– occurs when a barrier forms within the habitat– often caused by human development. Like what?

16.4 Threats To Biodiversity

• Habitat corridors are a solution to the problem.– corridors can be road overpasses or underpasses– allow species to move between different areas of

habitat

16.4 Threats To Biodiversity

Introduced species can disrupt stable relationships in an ecosystem. How?

• An introduced species is one that is brought to an ecosystem by humans.– accidental– purposeful

• Invasive speciescan have anenvironmentaland economicimpact.

16.4 Threats To Biodiversity

• Invasive species often push out native species.– Burmese python (Florida Everglades)

16.4 Threats To Biodiversity

• Invasive species often push out native species.– mice (Australia)

16.4 Threats To Biodiversity

• Invasive species often push out native species.– kudzu (southeastern United States)

What invasive species do you know?

• Lamprey eel• Lupine• Emerald Ash Borer• Kudzu• Zebra Mussel• Asian Lady Beetle• Gypsy Moth

16.5 Conservation

KEY CONCEPT Conservation methods can help protect and restore ecosystems.

16.5 Conservation

Sustainable development manages resources for present and future generations. Thinking sustainably involves thinking in ______ not in a ______.• Sustainable development meets needs without hurting

future generations.– resources meet current needs– resources will still be available for future use

16.5 Conservation

• The timber industry has started to adopt sustainable practices.

• Global fisheries have adopted several sustainable practices.– rotation of catches – fishing gear review – harvest reduction – fishing bans

16.5 Conservation

Conservation practices focus on a few species but benefit entire ecosystems. How?

• The Endangered Species Act works to protect individual species from extinction.

• A listed species is often called an umbrella species. Why would it be called that?– the habitat in which the

species lives must be protected

– other species are protected because they share the ecosystem

16.5 Conservation

Protecting Earth’s resources helps protect our future.

• The Environmental Protection Agency (EPA) was created in 1970.

• The EPA develops policies and regulations to protect the environment.

• Legislation helps to protect the environment and endangered species.– Clean Air Act– Clean Water Act– Endangered Species Act

16.5 Conservation

• The National Park Service helps manage public lands. Name at least two national parks in the US.

• The park system includes over 390 areas, covering 84 million acres.

16.5 Conservation

• There are several ways that people can help protect the environment.– control population growth– develop sustainable technology and practices– protect and maintain ecosystems

16.5 Conservation

What causes smog? • A. the burning of particulates • B. the formation of ozone • C. acid rain • D. the interaction of sunlight with pollutants produced by burning

fossil fuels

16.5 Conservation

What causes smog? • A. the burning of particulates • B. the formation of ozone • C. acid rain • D. the interaction of sunlight with pollutants produced by burning

fossil fuels • Correct Answer = D

How is ground-level ozone formed? • A. coal particulates combine with oxygen molecules in the air • B. an oxygen atom is transferred from carbon dioxide to an oxygen

molecule • C. an oxygen molecule is transferred from nitrogen oxide to an

oxygen atom • D. an oxygen atom is transferred from nitrogen dioxide to an oxygen

molecule

16.5 Conservation

What causes smog? • A. the burning of particulates • B. the formation of ozone • C. acid rain • D. the interaction of sunlight with pollutants produced by burning

fossil fuels • Correct Answer = D

How is ground-level ozone formed? • A. coal particulates combine with oxygen molecules in the air • B. an oxygen atom is transferred from carbon dioxide to an oxygen

molecule • C. an oxygen molecule is transferred from nitrogen oxide to an

oxygen atom • D. an oxygen atom is transferred from nitrogen dioxide to an oxygen

molecule • Correct Answer = D

16.5 Conservation

What is global warming? • A. the normal temperature fluctuations of Earth's climate cycle • B. the melting of the polar ice caps • C. the trend of increasing temperatures on Earth • D. the changes in Earth's biosphere that affect the atmosphere

Why are frogs considered an indicator species for water quality? • A. They are easily killed by direct contact with pollutants. • B. They are able to break down pollutants. • C. They come into direct contact with pollutants and show readily

observed effects like deformities. • D. They develop diseases when they come in direct contact with

pollutants.

16.5 Conservation

What is global warming? • A. the normal temperature fluctuations of Earth's climate cycle • B. the melting of the polar ice caps • C. the trend of increasing temperatures on Earth • D. the changes in Earth's biosphere that affect the atmosphere • Correct Answer = C

Why are frogs considered an indicator species for water quality? • A. They are easily killed by direct contact with pollutants. • B. They are able to break down pollutants. • C. They come into direct contact with pollutants and show readily

observed effects like deformities. • D. They develop diseases when they come in direct contact with

pollutants. • Correct Answer = C

Review• Preserving biodiversity helps the species and

helps humans• Habitat corridors help preserve habitats• Avoiding invasive species introduction

protects biodiversity• Sustainable development manages resources• Protecting individual species assists entire

environments• The National Park system protects habitats for

diverse species.