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LOSS OF BIODIVERSITY (Why are Europeans good invaders? (living at higher…
LOSS OF BIODIVERSITY
3 MAIN CAUSES OF RECENT EXTINCTIONS
Habitat loss and Fragmentation
fragmentation = loss of connections, corridors that link fragments
habitat loss
Introduced predators and diseases
Nile perch to Lake Victoria, Red foxes to Australia causing extinction of Burrowing Betong and rock-wallabies, brown tree snakes caused extinction of Guam Rails and Micronesian kingfisher
Overkill by humans
Golden toad
Passenger pigeon
hunted for food
game birds (after wild turkey)
great auk
ground sloth, extinct 7-10000 years ago
two main hypotheses:
Climate change
human colonisation
Lemurs, elephant birds, large birds such as moas
Giant-short faced kangaroo that extinct 30000 years ago, 200 kg and 3M tall
Why are Europeans good invaders?
living at higher densities
large grazing mammals
immunity to diseases