Conservation and Biodiversity
Extinction
Dodo: Island of mauritius (south east africa) why did it die? arrivarl of dutch in 1600s, deforestation, invasive species (cats, dogs, rats) dodo were flightless, had a short legs and had no adaptation to avoid predators.
C4-U6 components of biodiversity: biological biodiversity has two components- richness= number of different species presents- evenness= how close in numbers each species is
C4-U1 indicator species & biotic indices: An indicator species is an organism whose presence absence or abundance reflects a specific environmental condition
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large size vs small size: -large sites will avoid extinction with unexpected factors like fire or disease, - large sites have more resources and breeding sites
C4-U5 geographics features the affect biodiversity
features that affect biodiversity:
forest fragmentation -slipt in half by roads or farms
exception: cow birds thrives at the edge where it lays its eggs --> increase in cow bird population
edge efffect= boundaries between habitts or ecosystems. -at the edge of the forest, there is more sunlight, more wind and less moisture than at the center --> decreased population on the edge
nature x: the edge effect
this describes that boundaries between habitats or ecosystems. one example is the boundary between forestry and cleared or agricultural land
the boundary is not a wall - there is disturbance from the outside which extends into the forest. if the forest is more fragmented and has more edges, more of the forest will be disturbed.
features the affect biodiversity: corridors= used to connect isolated populations - WWF established corridors between 40 isolated panda populations
active management of endangered species
human intervention in conservation of an area
techniques
restoration: restore land to natural state
-recovery of threatened species
-removal of introduced species
legal protection against development or pollution
-captive breeding
- reintroduction programs