3.4.6 biodiversity in a community Flashcards
(9 cards)
1
Q
Biodiversity
A
Variety of species in one habitat
2
Q
Three different components to biodiversity
A
- Species diversity
- Genetic diversity
- Ecological diversity
3
Q
Uses of ecological diversity
A
Investigates habitats and therefore habitat loss
4
Q
Uses of species diversity
A
- Counting species in an area - richness
- Counting individuals - eveness
- Eveness adds resilience to environmental change
5
Q
Uses of genetic diversity
A
- Variety of alleles
- less variety = increased genetic diseases
- Increases biodiversity as higher resilience to changing environment
6
Q
How can you calculate biodiversity
A
Index of diversity
7
Q
Impacts of agriculture on genetic diversity
A
- Humans select for particular characteristics, reduces the variety of allelles and genetic diversity
- Reduces animals movement and energy levels, so feeding levels are lower
- monoculture - one species live there
- Pesticide and herbicide and fertiliser
- deforestation
8
Q
reducing effects of agriculture on biodiversity
A
- hedgerows
- intercropping
- reducing herbicide and pesticide
- preserving wetlands instead of draining them for farmland
- leave wet corners of farm, to increase biodiversity which may eat the insects so less herbicide
- organic fertilisers
- nitrogen fixing
9
Q
Genetic drift
A
- Random chance affects allele frequency
- In a very small population alleles can be completely lost via random chance
- Slow allele change over multiple generations
