threats to biodiversity. who are the key players in maintaining a healthy ecosystem?
DESCRIPTION
Endemic species: a species that is native to a particular place and that is found only there. a species that is native to a particular place and that is found only there. Giraffes on the savannah Giraffes on the savannah Polar bears in the Arctic Polar bears in the Arctic White-tailed Deer in Livingston White-tailed Deer in LivingstonTRANSCRIPT
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Threats to Biodiversity
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Who are the key players in maintaining a healthy ecosystem?
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Endemic species:
•a species that is native to a particular place and that is found only there.•Giraffes on the savannah•Polar bears in the Arctic•White-tailed Deer in Livingston
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•Ecologists often use the numbers of endemic species of plants as an indicator of overall biodiversity because plants form the basis of ecosystems on land.
•Areas of the world with greater diversity also have large numbers of endemic species.
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Giraffes on the African Savannah
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Kangaroos and Koalas in Australia
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Darwin’s finches are endemic to the Galapagos
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Keystone Species:•“A species that is critical to the
functioning of the ecosystem in which it lives because it affects the survival and abundance of many other species in its community”
•Critical member of the ecosystem•Removal of this species could bring
collapse to the entire food web
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Sea Otters Sea Urchins Kelp
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Jaguars Top predators
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Sea Stars Sea Urchins, Clams and Snails
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Elephants destroy trees clearing land for savanna habitat
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Beavers convert streams with dams to make marshes and swamps
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Grizzly Bears Salmon Fertilizer??
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Video- Why are bees disappearing?
http://www.ted.com/talks/marla_spivak_why_bees_are_disappearing.html
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THREAT 1: Habitat Destruction
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Threat 2: Poaching, Overhunting
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Threat 3: Invasive Species• http://www.youtube.com/watch?v=iLH1qLCvqSg
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What makes a Species Invasive?
• Non-native, or alien species- doesn’t belong in particular ecosystem
• Generalist- thrive in a wide range of habitats, reproduce quickly
• Few to no predators- can thrive unchecked• Outcompete endemic species for resources-
sunlight, food, space, water
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Threat 4: Pollution
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Threat 5: Over-Hunting and Over-Harvesting
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Threat 6: Global Climate Change
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Threat 6: Global Climate Change
• If fossil fuel emission trends continue, the world may be 6 deg. C warmer (11 deg F) by 2100 (IPCC)
• The Earth may lose 25% of all land species by 2100.
• If species cannot adapt, they go extinct• Other species may take their place,
including invasives