Save
Unit 3 - Sustainability and Interdependence
Threats to Biodiversity : Key Area 8
Save
Share
Learn
Content
Leaderboard
Share
Learn
Created by
Daniel Smith
Visit profile
Cards (13)
Exploitation and recovery of populations
The impact on their
genetic diversity
View source
With
overexploitation
, populations can be reduced to a low level but may still
recover
View source
Some species have a naturally low
genetic diversity
in their population and yet remain
viable
View source
Bottleneck effect
Small populations may lose the
genetic variation
necessary to enable
evolutionary
responses to environmental change
In small populations, this loss of genetic diversity can be critical for many species, as
inbreeding
can result in poor
reproductive rates
View source
Habitat loss and habitat fragments
Impact on species
richness
View source
The clearing of habitats has led to
habitat fragmentation
View source
Degradation
of the edges of habitat fragments results in
increased competition
between species as the fragment becomes smaller, which may result in a decrease in biodiversity
View source
To remedy widespread habitat fragmentation
1.
Isolated
fragments can be linked with habitat
corridors
2. The corridors allow movement of animals between fragments, increasing access to
food
and choice of
mate
3. This may lead to
recolonisation
of small fragments after local
extinctions
View source
More
isolated
fragments and smaller fragments exhibit a
lower
species diversity
View source
Introduced
, naturalised and
invasive species
Impact on
native populations
View source
Introduced
(
non-native
) species
Humans have moved them either intentionally or
accidentally
to
new geographic locations
View source
Naturalised
species
Introduced species that become established within
wild
communities
View source
Invasive species
Naturalised species that spread rapidly and eliminate native species, therefore reducing species
diversity
They may be free of the predators,
parasites
,
pathogens
and competitors that limit their population in their native habitat
They may prey on native species,
out-compete
them for resources or
hybridise
with them
View source
See similar decks
4.5.1 Threats to Biodiversity
Edexcel A-Level Biology > Topic 4: Biodiversity and Natural Resources > 4.5 Conservation of Biodiversity
125 cards
4.5.1 Threats to Biodiversity
Edexcel A-Level Biology > Topic 4: Biodiversity and Natural Resources > 4.5 Conservation of Biodiversity
132 cards
1.2.2 Threats to Biodiversity
AQA A-Level Environmental Science > 1. The Living Environment > 1.2 Conservation of Biodiversity
68 cards
4.1.1 Interdependence
OCR GCSE Biology > B4: Community Level Systems > 4.1 Ecosystems
86 cards
9.1.1 Interdependence
Edexcel GCSE Biology > Topic 9: Ecosystems and Material Cycles > 9.1 Ecosystems
34 cards
6. Sustainability
AQA A-Level Environmental Science
335 cards
7.1.2 Interdependence
AQA GCSE Biology > Unit 7: Ecology > 7.1 Adaptations, Interdependence, and Competition
30 cards
7.1.2 Interdependence
GCSE Biology > Unit 7: Ecology > 7.1 Adaptations, Interdependence, and Competition
29 cards
8.6 Biodiversity
AP Biology > Unit 8: Ecology
38 cards
9.4.1 Threats
AQA A-Level Computer Science > 9.0 Fundamentals of communication and networking > 9.4 Network security
77 cards
Unit 1: Cells, Living Processes, and Biodiversity
CCEA GCSE Biology
615 cards
4.5 Biodiversity
AQA A-Level Biology > 4. Genetic Information, Variation, and Relationships Between Organisms
30 cards
3. Biodiversity
CCEA GCSE Biology > Unit 1: Cells, Living Processes, and Biodiversity
207 cards
6.1.2 Biodiversity
OCR GCSE Biology > B6: Global Challenges > 6.1 Monitoring and Maintaining the Environment
41 cards
4.1 Biodiversity
Edexcel A-Level Biology > Topic 4: Biodiversity and Natural Resources
191 cards
6.8 Urban Sustainability
AP Human Geography > Unit 6: Cities and Urban Land-Use Patterns and Processes
35 cards
2.1.2 Biodiversity
WJEC GCSE Biology > Unit 2: Variation, Homeostasis, and Microorganisms > 2.1 Classification and Biodiversity
51 cards
7.3.1 Biodiversity
GCSE Biology > Unit 7: Ecology > 7.3 Biodiversity and the Effect of Human Interaction on Ecosystems
24 cards
6.6. Urban Waste and Sustainability
AQA A-Level Geography > Component 2: Human Geography > 6. Contemporary Urban Environments
46 cards
7.3.1 Biodiversity
AQA GCSE Biology > Unit 7: Ecology > 7.3 Biodiversity and the Effect of Human Interaction on Ecosystems
40 cards
4.2 Biodiversity
OCR A-Level Biology > Module 4: Biodiversity, evolution and disease
88 cards