Chapter 3 Glossary Terms Huck
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Biodiversity is the variance and the different number of species in a specific area
- To legally guard from harm a species that is considered or listed to be endangered, threatened, or of special concern.
- An example would be sharks who are protected from hunters who want there fins for soup.
- A biodiversity hotspot is a place where there is an exceptionally large number of different species living in a relatively small area.
- An example would be the
All the different populations of species that interact in a specific area or ecosystem
- The dominant species are the species that are so large in size that they make up the most of biomass out of all the community members
- A removal of the dominant species will decrease the biodiversity of the ecosystem
- They are species that can greatly affect the population numbers and the general health of an ecosystem. Keystone species are generally not abundant and can be both plants and animals.
- An example would be the sea otters who would eat sea urchins and prevented them from eating the kelp forests in British Columbia
- It is the breeding of rare or endangered wildlife in a controlled environment.
- This method is commonly used to increase the population size of that species so that it does not become extinct
- An example of this would be the black footed ferret. A hundred young black footed ferrets have been released from the captive breeding program back into the wild
- A species that cause a large and noticeable change in the landscape that it creates a completely new ecosystem
- An example would be the beaver creating dams which creates ponds, many species benefit from this change
A series of changes, positive or negative, that take place in an ecosystem over time. It is usually caused by a disturbance.
Is the destruction or alteration of a habitats which usually result from human activities. This prevents species from living in that habitat. It can also be caused by natural distastes.
- It is the practice of clearing and logging forests without replanting them. The land that is cleared is usually used for agricultural needs or for homes
- Since the trees are a home to many species we can expect for many species to become extinct.
- An alien species is a species that is either deliberately or accidentally put into a new location. This is usually due to human activities.
- Invasive species are just alien species that instead of doing what is intended, takes over the current habitat.
- An example would be Zebra mussels. They were brought over from Asia from ballast water. They are able to compete with native mussels and other species that share it's food. This affects other levels of the aquatic food chain
It is when we use or extract a resource long enough that it becomes depleted or gone.
- It is the death of all the individuals of a species.
- There are two different types of extinction one being called mass extinction. This is caused when there is a sudden change and makes the ecosystem unsustainable or unsustaining. ie, dinosaurs, etc...
- The second type of extinction is called background extinction. This is when there is extinction over long periods of time
- A biodiversity crisis is when there is an increase in the extinction rates (the rate in which a species becomes extinct)
- It is estimated that the extinction rate is 100-1000 times larger than the background rate (the natural rate of extinction)
- Restoration Ecology is the renewal of a degraded or destroyed ecosystem by active human intervention.
- There are two main restoration techniques. Reforestation and Wetlands restoration.
It is a type of restoration technique where we try to regrow forests by replanting seeds or fully grown trees to areas where a forest was cut down.
- It is the use of a species to control the population growth or the spread of and undesirable species.
- An example would be the use of the European Fly to control the population of the Gypsy Moth
- This is a method of using living organisms to clean up contaminated areas naturally
- The contamination is usually caused by humans
- An example of this would be the use of plants to remove the heavy metals in the soil left over from human activities
- The organism used for bio augmentation usually does not survive
- It is the use of organisms to add essential nutrients to areas naturally
- An example would be the use the clover to add nitrogen into the soil.
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