The Living Earth

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The Living Earth

• HS Biology

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Biosphere

• What makes the earth different than other
  planets?
• One difference is the earths abundance of living
  things.
• The part of the earth that supports life is
  called the biosphere.

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Made of the top portion of Earths crust, all the
water on earths surface, and the surrounding
atmosphere.
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Biosphere

• Made up of different environments that are home
  to different kinds of organisms
• Deserts little rain- cactus, coyotes and lizards
• Arctic regions cold- polar bears, seals, and
  walrus
• All living organisms that inhabit an environment
  are called BIOTIC factors

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Ecosystem

• All the organisms living in an area and the
  nonliving features of their environment
• Abiotic factors are the nonliving parts of the
  environment.
• Examples are air currents, temperature, moisture,
  light and soil.

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ECOLOGY

• The study of the interactions that occur among
  organisms and their environment
• Ecological study reveals interrelationships
  between biotic and abiotic parts of the world

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Ecology
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What are some biotic and abiotic factors in this
ecosystem?
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Organizing Organisms

• Ecologists study interactions among organisms at
  several different levels
• They study individual organisms, interactions
  between organisms of the same species, and
  interactions between organisms of different
  species

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POPULATION

• A population is made up of all the organisms in
  an ecosystem that belong to the same species
• Members of the same population compete with one
  another for food, water, mates, and other
  resources.
• The ways in which organisms in a population share
  the resources of their environment determine how
  far apart populations are and how large each
  population can become.

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Gannet population
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Community

• All the populations in an ecosystem.
• The prairie community is made of populations of
  bison, grasshoppers, cowbirds, and all other
  species in the ecosystem.

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Habitat
The place in which an organism lives
There are many habitats within an ecosys-tem
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Habitat

• Must provide the kinds of food, shelter,
  temperature, and moisture the organism needs to
  survive
• For example, trees are the woodpeckers habitat

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Niche

• A niche is the role a species plays in a
  community
• The space, food, and other conditions an organism
  needs to survive and reproduce are part of its
  niche.
• A species niche includes more than just feeding
  relationships.
• It also includes how a species uses and affects
  its environment.

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