-
-
-
-
-
-
-
-
-
-
Habitat Loss
- Habitat loss occurs when events, ddue to natural disasters or human activities, alter a terrestrial or aquatic ecosystemso much that many species can no longer survive there
- ex. can be caused by deforestation, draining wetlands
-
Deforestation
Deforestation occurs when forests are logged or cleared for human use, and are never replanted
-
Alien Species
- A species that is accidentally or diliberately introduced into a new location.
- ex. zebra mussels- introduced to great lakes through ballast water from Asia
-
Invasive Species
- A species that can take over the habitat of native species.
- -alien species are invasive species
- -ex. zebra mussels
-
Overexploitation
- Use or extraction of a resource until it is depleted
- -eg. overfishing of atlantic cod, overhunting of passenger pigeons
-
Extinction
- the death of all the individuals of a species
- eg. Dodo bird, passenger pigions etc.
- -may happen naturally through background extinction, caused by slow changes in ecosystems that affect species, or through mass extinction which occurs more quickly
- -may be caused by human activities such as overexploitation
-
-
Restoration Ecology
- The renewal of degraded or destroyed ecosystems through active human interactions.
- Restoration methods
- -reforestation
- - wetlands restoration
- -controlling alien species
- -chemical control
- -bioremediation
- -bioaugmentation
-
Reforestation
Regrowth of a forest, either through natural processes or through the planting of seeds or trees in an area where a forest was cut down
-
Biocontrol
- The use of a species to control the population growth or spread of an undesirable species
- eg. use of a european fly to control the gypsy moth
- eg. use of bacteria spraying to control tent caterpillars and other forest pests
-
Bioremediation
- the use of living organisms to clean up contaminated areas naturally
- eg. use of plants to absorb heavy metals from toxic soil
- eg. use of bacteria to clean up oil spills on the coast
-
Bioaugmentation
- The use of living organisms to add essential nutrients to depleted soils
- eg. use of clover to add nitrogen to depleted soils
|
|