Slides in this set

Slide 1

Preview of page 1

DIVERSITY
Hierarchy: Groups within groups that do not overlap…read more

Slide 2

Preview of page 2

BIODIVERSITY: THE RANGE AND VARIETY OF
GENES, SPECIES AND HABITATS WITHIN A
PARTICULAR REGION
· 3 parts of bios diversity:
· Species diversity: the number of different species and the number of
individuals of each species within one community
· Genetic diversity: the variety of genes possessed by individuals that
make up one species
· Ecosystem diversity: the range of different habitats in one area…read more

Slide 3

Preview of page 3

SPECIES DIVERSITY
· Better estimate: measures both number of species and the number
of individuals therefore takes account of species that are present in
small numbers
· Shows stability of ecosystem; higher the species diversity, the more
stable it is and less affected by climate change it is…read more

Slide 4

Preview of page 4

AGRICULTURE ON SPECIES DIVERSITY
· Selective breeding: decreases genetic diversity
· Large farms= cheaper and more efficient ­ resulted in destruction of
hedgerows; habitats and wildlife corridors
· Monoculture- grows only best kind of crops; reduces genetic
diversity and renders all crops susceptible to disease; reduces
species diversity because there are few niches
· Fertilisers: maintain soil fertility, can pollute groundwater, killing
aquatic animals
· Pesticides and herbicides kill plants and animals; reduces diversity…read more

Slide 5

Preview of page 5

DEFORESTATION EFFECT
· Reduces biodiversity as trees are homes to animals and they feed
off of them; forests have high complex food webs with high diversity.
· Also reduces the rate at which carbon dioxide is removed from the
atmosphere and so it increases the greenhouse effect and global
warming…read more

Slide 6

Preview of page 6

GENETIC DIVERSITY
· Greater the number of alleles possessed in members of a species,
the greater the genetic diversity of that species
· High genetic diversity= more likely species will adapt to some
environmental change as:
· A wider range of alleles
· So a wider range of characteristics
· Thus increasing probability an individual will possess a characteristic
which suits the new environment…read more

Slide 7

Preview of page 7
Preview of page 7

Slide 8

Preview of page 8
Preview of page 8

Slide 9

Preview of page 9
Preview of page 9

Slide 10

Preview of page 10
Preview of page 10

Comments

No comments have yet been made

Similar Biology resources:

See all Biology resources »See all resources »