Sustainable Ecosystems 3
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the number and variety of organisms found in a specific region
What does protect mean?
- To legally guard from harm a species that is listed as endangered,threatened or of special concern.
- eg. dont fish dolly varden
what is a biodiversity hotspot?
- a place where there is an exceptionally large number of species in a relatiively small area
- eg Carolinian Canada
what is a community?
all the populations of the different species that interact in a specific area or ecosystem
what is a dominant species?
- a species that is so abundant that it has the biggest biomass of any community member
- eg. primary producers; if removed ecosystem will collapse
what is a keystone species?
- a species that can greatly affect population numbers and the health of an ecosystem
- eg sea otters eat sea urchins, controls kelp levels
what is captive breeding?
- the breeding of rare or endangered wildlife in controlled settings to increase the poulation size
- eg, prairie dogs help soil and earth but had low numbers because of ferrets so were bred captively until had a sustainable population size
What is an ecosystem engineer?
- a species that causes such dramatic changes to landscapes that it creates a new ecosystem
- eg. beavers turn small stream to aquatic ecosystem
what is succession?
- the series of changes in an ecosystem that occurs over time, following a disturbance
- eg beavers turn forest to flooded forest, to sunny pond to abandoned pond.
- can benefit many species
what is habitat loss?
the destruction of habitats which usually results from human activities, or perhaps natural disasters
what is deforestation?
- the practice of claring forest for logging or other human uses, and never replanting them
- may lead to desertification
what is an alien species?
- a species that is accidentally or deliberately introduced to a new location
- eg. zebra mussels
what is an invaisve species?
- a species that can take over the habitat of native species
- (no natural predators, grow exponentially and eat many other organisms)
- eg round gobies
what is overexploitation?
- the use or extraction of a resource until it is depleted.
- biodiversity is threatened
what is extinction?
- the death of all the individuals of a species
- eg platypus, dinosaurs, etc
- happens to 17 species per hour! :0
what is a biodiversity crisis?
- the current accelerated rate of extinctinons
- usually results from actions of humans; deforestation, air and water pollution
what is restoration ecology?
- the renewal of degraded or destroyed ecosystems through acticve human intervention
- goal is to stimulate natural processes of regeneration to produce a sustainable or identical ecosystem
what is reforestation?
the regrowth of a froest, either through the planting of seeds or trees in an area where a forest was cut down :)
what is biocontrol?
- the use of a species to control the population growth or spread of an undesirable species
- eg european parasitoid was relased to control amont of gypsy moths eating leaves (had escaped from lab)
what is bioremediation?
- the use of living organisms to clean up conatminated aeras naturally
- eg certain plants are grown at toxic sites because they clean soils by colleccting poisons in their tissues
what is bioaugmentation?
- the use of organisms to add essential nutrients to depleted soils
- eg. clover is often planted to replenish nitrogen levels in soil (important nutrient for plants)
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