Extinction

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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