03 biodiversity under threat
TRANSCRIPT
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Edexcel A2 Geography
Unit 3 Contested planet
Biodiversity under threat
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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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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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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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Defining biodiversity (1)
Biodiversity can be measured in three ways:
ecosystem diversity
genetic diversity
species diversity
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Defining biodiversity (2)
What is biodiversity?
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The global distribution of biodiversity
Global distribution of biodiversity
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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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Valuing ecosystems (2)
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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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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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Strategies (2)
Spectrum of conservation strategies