Download Biotic Interactions in Ecosystems

BIOTIC
INTERACTIONS
IN
ECOSYSTEMS
Biotic Interactions
• Organisms within an ecosystem
constantly interact to obtain food, water,
sunlight, or habitat.
• As a result of these interactions,
organisms have special roles – or
niches – in their ecosystem.
Biotic Interactions
• An organism’s niche is the way it
contributes to, and fits into its
environment. “How it makes a living”
Important Words
Species – a group of closely related
organisms that can reproduce with one
another
Population – all the members of a
species within an ecosystem
Community – populations of different
species that interact in an ecosystem
Different kinds of Biotic Interactions
Symbiosis refers to the interaction of
two different organisms that live in
close association. Three different
kinds of symbiotic interactions are...
Different kinds of Biotic Interactions
1. Commensalism – one organism
benefits and the other organism is
neither helped not harmed
Different kinds of Biotic Interactions
2. Mutualism – both organisms benefit
and sometimes neither species can
survive without the other.
LICHENS!
Different kinds of Biotic Interactions
2. Mutualism – both organisms benefit
and sometimes neither species can
survive without the other.
Different kinds of Biotic Interactions
3. Parasitism – one species benefits,
the other is harmed
Other Biotic Interactions
Competition – Organisms require the
same resource (such as food) in the
same location at the same time.
Other Biotic Interactions
Competition – Organisms require the
same resource (such as food) in the
same location at the same time.
Spotted Knapweed
Other Biotic Interactions
Predation – One organism (the
predator) eats all or part of another
organism (the prey).
Video
Other Biotic Interactions
Mimicry – Prey animal mimics another
species that is dangerous or tastes
bad, to avoid being eaten.
Real
Fake !