ORGANISMS AND THEIR RELATIONSHIPS

1
ORGANISMS AND THEIR RELATIONSHIPS
2
Main Idea Biotic and abiotic factors interact
in complex ways in communities and
ecosystems Ecology study of relationships
between organisms and their interaction with
their environment Biosphere the portion of the
Earth that supports life. Biotic the living
portion of the environment Examples - Abiotic
the non living portion of the environment Example
s http//www.arkive.org/osprey/pandion-haliaetu
s/video-00.html http//video.nationalgeographic.c
om/video/player/animals/birds-animals/birds-of-pre
y/osprey.html
3
Levels of Organization
4
What is a population?

• A population is a group of individuals of the
  same species that share a common geographic area
  at the same time.

5
What is a biological community?

• A biological community is a group of interacting
  populations that occupy the same geographic area
  at the same time

6
Ecosystem Interactions

• Remember, ecology studies organisms and their
  interaction with their environment and each
  other.
• An organisms habitat is an area where the
  organism lives.
• A niche is the an organisms role or position
  (what it does)

7
Habitat or niche?
8
Community Interactions

• Organisms constantly interact with one another!-
  How???
• Competition for resources such as food, water,
  space
• Predation as when one organism consumes another.
• http//video.nationalgeographic.com/video/player/s
  pecials/editors-picks-specials/predator-vs-prey/le
  opard_protectskill.html

9
Symbiotic relationships

• The close relationship that exists when 2 or more
  species live together.
• Types of symbiosis
• Mutualism , both organisms benefit
• Commensalism , 0 one organism benefits and the
  other is not affected.
• Parasitism - , one organism benefits the
  other is harmed