Symbiosis
Essential Questions
►What is symbiosis?
►List and describe (in your own words) the 5
main types of symbiosis.
►Give an example for each type of symbiosis.
How Species Interact with Each Other
-Niche:
The unique role (or job) of a species within an ecosystem
-Symbiosis: a relationship in which two organisms
live in close association
How Species Interact with Each Other
-Niche:
The unique role (or job) of a species within an
ecosystem
-Symbiosis: a relationship in which two organisms
live in close association
-5 types of symbiosis:
1. Competition
2. Predation
3. Parasitism
4. Mutualism
5. Commensalism
1. Competition: when individuals attempt to use the
same resources
-Competition takes place
when two organisms occupy
the same niche
2. Predation: when an organism feeds on another
organism
Predator vs. Prey
http://www.youtube.com/watch?v=6igTJG8Mf
Nk&feature=related
3. Parasitism: the relationship between parasite and
host
-Parasite: an organism that lives on and feeds off of
another organism
-Host: the organism the parasite takes its nourishment
from
A parasite is an organism that
associates with the host in a
negative and unhealthy
manner which will often
damage the host and
detrimentally affect the
reproductive capacity of the
host (and species).
A human embryo or fetus is a
member of the same species
that associates with the
mother in a positive and
healthful manner necessary
for the procreation of the
species.
3. Parasitism: the relationship between parasite and
host
-Parasite: an organism that lives on and feeds off of
another organism
-Host: the organism the parasite takes its nourishment
from
Heartworm
4. Mutualism
A close relationship between two species in which
each species provides a benefit to the other
Egyptian
Plover
Bird
5. Commensalism: a relationship in which one
species benefits and the other species is not harmed
or helped
5. Commensalism: a relationship in which one
species benefits and the other species is not harmed
or helped
How Species Interact
-Symbiosis
-Types of symbiosis
1. Competition
2. Predation
3. Parasitism
4. Mutualism
5. Commensalism
Is the unborn human being a parasite?
General Parasitology, Second Edition
by Thomas C. Cheng
A parasite is defined as an
organism of one species living
in or on an organism of
another species
Cheng, T.C., General
Parasitology, p. 7, 1973.
General Parasitology, Second Edition
by Thomas C. Cheng
When a parasite invades a
host, the host responds with
an immune response against
the parasite (forming
antibodies in response to the
molecules secreted by the
parasite)
(See Cheng, T.C., General
Parasitology, p. 8.)
The unborn child is recognized
by the mother’s body as
something to be protected,
not attacked.
"The Embryo as a Transplant”
Scientific American
General Parasitology, Second Edition
by Thomas C. Cheng
A parasite is detrimental to
the reproductive capacity of
the invaded host and its
species.
(See Cheng, T.C., General
Parasitology, p. 8.)
A human embryo is absolutely
essential to the reproductive
capacity of the mother and
her species.
General Parasitology, Second Edition
by Thomas C. Cheng
A parasite is an invading
organism -- coming to
parasitize the host from an
outside source.
A human embryo or fetus is
formed internally
A parasite is an organism that
associates with the host in a
negative and unhealthy
manner which will often
damage the host and
detrimentally affect the
reproductive capacity of the
host (and species).
A human embryo or fetus is a
member of the same species
that associates with the
mother in a positive and
healthful manner necessary
for the procreation of the
species.