Please enable JavaScript.
Coggle requires JavaScript to display documents.
5.2 Extinctions and Protecting Species (extinctions (evolution does not…
5.2 Extinctions and Protecting Species
extinctions
evolution does not increase or decrease biodiversity
speciation increases biodiversity
speciation rate is faster than extinction rate (biodiversity increases over time)
extinction decreases biodiversity
extripation is a local extinction- species still exsit but not in a specifif care
extinctions are permament (5-10 million years for natural speciation to replace the species wiped out)
rate of loss of about 1 species per year for every 1 million species living on earth
99.9% of all species tat have existed are gone forever
most species exist for between 2-10 million years
5 mass extinctions in eaths history
changes in governmental conditions: too fast for species to evolve and adapt to
current extinction rates are way higher than background rates
100 times faster than in pre human times
some species are more vulnerable to extinction
specialists
high trophic levels
k-stategists
live in a small range
rare
commercially valuable
treaties and laws to protect species
establishing and enforcing national enviornmental laws
convention on international trade in endangered species (bans hunting, capturing and selling of threatened o endangered species)
cites has helped reduce trade in products from elephants, crocodiles to chimpanzees and cheetahs
countries who do not enforce it properly mean trading still happens
convention on biological diversity: reduce the rate of extinction by focusing on whole ecosystems and sustainability on a global scale
no way of enforcing the laws
USA did not sing it
the US endangered species act (one of the most effective)
wild life refuges (not very effective)
protecting species
wildlife farms
zoos and aquariums
AZA- accredited
seed banks and botanical gardens