Sustainable Ecosystems 3
Card Set Information
Sustainable Ecosystems 3
Sustainable ecosystems science
Sustainable Ecosystems chapter 3
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)