Download Interactions among organisms

Kinds of Organism Interactions
1. Predation
2. Competition
3. Symbiotic relationship
4. Some relationships are difficult to
categorize
Kinds of Organism Interactions
1. Predation (predator & prey
relationship)
One organism known as a predator,
kills and eats another known as prey
Robins & Earthworms: Predation
Venus Flytrap & Insect: Predation
Kinds of Organism Interactions
2. Competition
Two organisms strive to obtain the same
limited resources.
• Intraspecific competition
Is competition between members of the
same species.
• Interspecific competition
Is competition between members of different
species.
Intraspecific competition
(same species)
Interspecific competition
(different species)
Kinds of Organism Interactions
3. Symbiotic relationships
Is a close, long lasting, physical relationship
between TWO different species.
3.1 Parasitism (+,-)
• Is a relationship in which one organism
(parasite) lives inside or on surface of
another organism known as the host,
from which it derives nourishment
3.1.1 Ectoparasite
Live on the surface of their hosts
such as fleas, lice, mildews.
3.1.2 Endoparasites
Live inside the bodies of their hosts such
as tapeworms, malaria parasites.
Ectoparasite:
Live on the surface of hosts
Lice: Parasitism (Ectoparasite)
Mildews (Ectoparasite):
a black,
green, or whitish area caused by a fungus that grows
on things such as plants, paper, cloth, or buildings,
usually if the conditions are warm and wet:
Tape worms: Parasitism
(Endoparasite)
Endoparasites:
Live inside the bodies of hosts
Kinds of Organism Interactions
3.2 Commensalism (+,0)
Is a relationship between organisms in
which one organism benefits while the
other is not affected.
Shark and remoras
(small fish)
Wild Orchids: Commensalism
Kinds of Organism Interactions
3.3 Mutualism (+,+)
Is actually beneficial to both species
involved.
The relationship is obligatory; the
species cannot live without each
other.
Bee and Flower: Mutualism
Kinds of Organism Interactions
4. Some relationship are difficult to
categorize
• How would you classify mosquitos?
• There are also mutualistic relationship
that do not require permanent contact
between participants in the relationship