organism diversity in ecosystems
TRANSCRIPT
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Organism Diversity in Ecosystems
12/14/09EQ: How do organisms
diversify in an ecosystem?
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Getting the idea• Ecosystems are home to
many different organisms.• Ecosystems host living and
non-living parts.
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Getting the idea• Ecosystems can host many
different organisms because each organism uses the ecosystem differently.
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Populations & Communities
•Biotic organizations – •Grouped into different
levels:•Populations•Communities
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Population• First level.•Group of
same species living in the same place.
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Population•Black tailed
deer in a forest
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Community•All of the organisms that
live in a forest• Including the black tailed
deer
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Habitats & Niches• Ecosystems can support
many populations.•A forest can support
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Habitats & Niches• The black
tailed deer
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Habitats & Niches•Rabbits
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Habitats & Niches• Foxes
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Habitats & Niches• Snakes
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Habitats & Niches•And many other things
because each population has it’s own Habitat.
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Habitat• The physical space used by a
population.• Habitat means Home• Includes living and nonliving
parts of ecosystem
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Habitat•A black tailed deer’s
habitat includes:
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Habitat• trees
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Habitat•Rocks
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Habitat• These are shared with the
other animals
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Niche•Describes lifestyle of
animal• Includes the habitat•AND
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Niche•Climate
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Niche• Food
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Niche•How it behaves
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Niche•Kestrels and owls
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Niche• Both
carnivorous• Eat small
mammals like mice & voles
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Niche•BUT •Owls are nocturnal•Kestrels hunt in the day
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Niche• They do not compete for
food because they don’t hunt at the same time. • They have different niches.
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Competition• If two organisms occupy
the same niche, • They compete for
resources
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Competition•One organism usually
becomes more efficient at finding & using resources• They other may move or
die out
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Competition•Rainbow Trout & Brown
Trout
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Competition• They live in the same
stream • They eat the same food• They share a habitat
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Competition•BUT they feed in different
parts of the stream• So they don’t directly
compete
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EQ:•How do organisms
diversify in an ecosystem?
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Questions:•What is the physical space
occupied by a population called?•Habitat