Extinction
3 Major causes
Species Introduction
Accounts for 39%
of extinctions
Introduction of
new diseases
Predation of other species
Increases competition
Hunting
Accounts for 23%
of extinctions
Habitat destruction
Accounts for 36%
of extinctions
Causes
Urbanization
Deforrestation
Overgrazing
Farming
Populations
The smaller the population of a
species the more vulnerable the
population is to extinction
Higher rate of extinction
on islands than on mainland
Can cause fragmentation
of a population
Decreases range of a
population
Mass extinction
Periodic mass of extinctions
where 35-40% of species go
extinct
Last major mass extinction
occurred 65 million years ago
with the dinosaurs
Preservation
Genetic rescue
Hybridization with a closely
related species
Can hinder preservation
due to loss of species gene
Reservations
Protection of animal habitats and resources
Corridors
Connection of many
fragmented populations
Increases chance to find mate
Translocation
Moving of a species
from one habitat to
a similar environment
Environment
Environmental change can
make it harder to survive
Promotes speciation
