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what is biodiversity?
the variety of all forms of life, from genes to species, through to the broad scale of ecosystems
Types of biodiversity
- 1.Genetic diversity
- 2.species diversity
- 3.ecosystem diversity
the total genetic information contained within all individuals of a species
the variety of species on earth
the array of biotic communities in a region along with abiotic components, such as soil, water, and nutrients
species that are found in an area and nowhere else
fragment large, contigous areas of natural habitats into small isolated fragments
the use of bacteria, archea, and plants to metabolize pollutants and render them harmless
Stability of a community
- 1.withstand a disturbance without changing
- 2.recover to former levels of productivity or species richness after disturbance
- 3. maintain productivity as conditons change overtime
measure of how much a community is affected by disturbance
measure of how quickly a community recovers following a disturbance
ex situ conservation:
the perservation of species in zoos, aquariums, or other artificial settings
what does a species-area plot show?
-the number of species found, on average, in a habitat of given size
WHat does a GAP analysis do?
-it compares the current distributions of species with the locations of preserved habitats
what is resilience?
-the ability to recover from a disturbance
what is the primary cause of endangerment in marine environments?
How does fragmentation reduce habitat quality?
fragmentation reduces habitat quality by creating edges that susceptible to invasion and loss of species, due to changed abiotic conditions
adding too many nutrients
- 1.Abrupt edge: just one big tree at the end and then no plants after. Decreases buffer
- 2.Gradual edge: the big forest gradually recedes into smaller plants then eventually disappears, increases buffer and increases diversity of the area type
- when fisheries fish till 1/2 of carrying capacity , that is where the maximum growth rate is located and the population will bounce back to maximum growth rate immediately
- -maximum yield
fish with net, bottom of net has tires dragged along bottom, makes the bottom of the ocean barren
non target species get caught
TED(Turtle Exclusion Device)
-avoid by catch
Purse Seine Fishing
- circular net
- -unfair type of fishing
- 1.cyanide binds to hemoglobin not allwoing them to get oxygen to blood
- 2.Mainly used for aquarium trade
Story of Africa
- 1.Nile perch introduced to the lake for sports fishing
- 2.Cichlid diversity reduced by 40% because Nile Perch is predator
- 3.People eat Nile Perch and burn many trees