martes, 12 de noviembre de 2013


UNIT 4  ECOSYSTEMS
An ecosystem is a group of plants, animals, and other living things that live in the same surroundings. It also includes nonliving materials, for example, water, rocks, soil, and sand. It consists of a biological community and its physical environment. All of Earth's ecosystems together constitute the biosphere.

  • Terrestrial ecosystems include forest, savanna, grassland, scrubland, tundra, and desert.
  • Marine and freshwater aquatic ecosystems include oceans, lakes, rivers, and wetlands.

COMPONENTS
  • living things: species, population, community
  • habitat
  • interrelationships


A species is often defined as a group of organisms capable of interbreeding and producing fertile offspring.
A population is a group of the same species of organism living in one area at the same time.
A community is a group of animals and plants that live together in the same environment.
A habitat is the place where an organism or a community of organisms lives. It includes all living and nonliving factors or conditions of the surrounding environment.



More information about this picture in:
http://eschooltoday.com/ecosystems/levels-of-organisation-in-an-ecosystem.html



 
Read about these pictures in:

RELATIONSHIPS

  • competition
  • mutualism
  • parasitism

The struggle between two or more individuals or species for a common resource is called competition.
An interaction between two species that benefits both of them is called a mutualism.
In parasitism one member of the relationship benefits while the other is harmed.

Games and videos in this website:
http://www.neok12.com/Ecosystems.htm

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