03 Biodiversity Under Threat
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Transcript of 03 Biodiversity Under Threat
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8/3/2019 03 Biodiversity Under Threat
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Edexcel A2 Geography
Unit 3 Contested planet
Biodiversity under threat
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Edexcel A2 Geography: Unit 3 Contested planet
Biodiversity under threat
Summary of content (1)
Defining biodiversity
The different ways of defining biodiversity
Global distribution of biodiversity and explanations
for it
Factors influencing biodiversity The value of ecosystems in terms of goods and
services
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Edexcel A2 Geography: Unit 3 Contested planet
Biodiversity under threat
Summary of content (2)
Biodiversity threats
The distribution of areas under threat
How threats affect ecosystem energy flow and
nutrient cycling
Global and local threats The link between level of development and
ecosystem destruction or conservation
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Edexcel A2 Geography: Unit 3 Contested planet
Biodiversity under threat
Summary of content (3)
Managing biodiversity
The concept of sustainable ecosystem yield
The spectrum of management strategies
The role of different players in ecosystem
management The uncertain future for biodiversity
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Edexcel A2 Geography: Unit 3 Contested planet
Biodiversity under threat
Defining biodiversity (1)
Biodiversity can be measured in three ways:
ecosystem diversity
genetic diversity
species diversity
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Edexcel A2 Geography: Unit 3 Contested planet
Biodiversity under threat
Defining biodiversity (2)
What is biodiversity?
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Edexcel A2 Geography: Unit 3 Contested planet
Biodiversity under threat
The global distribution of biodiversity
Global distribution of biodiversity
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Edexcel A2 Geography: Unit 3 Contested planet
Biodiversity under threat
Valuing ecosystems (1)
Ecosystems and biodiversity have a value due to
the services they provide.
These services are:
supporting
regulating
provisioning (goods)
cultural
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Edexcel A2 Geography: Unit 3 Contested planet
Biodiversity under threat
Valuing ecosystems (2)
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Edexcel A2 Geography: Unit 3 Contested planet
Biodiversity under threat
Threats
Biodiversity is threatened by a range of global and
local factors:
Globally, climate change is a significant threat.
Pollution and deforestation are global trends that
threaten many locations. The introduction of alien species is a serious problem.
Local concerns such as tourism, urban growth, and
predator and habitat change are important.
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Edexcel A2 Geography: Unit 3 Contested planet
Biodiversity under threat
Strategies (1)
Protecting biodiversity involves a wide range of
players.
Players often have different or conflicting attitudes.
There is also a spectrum of conservation strategies
with different outcomes for people and ecosystems.
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Edexcel A2 Geography: Unit 3 Contested planet
Biodiversity under threat
Strategies (2)
Spectrum of conservation strategies