Animations
Movies
Words
Appendix
Summary
Art
Art
Chapter
53
Quizzes:
Self
Activities
Chapter
Cum.
Unit 8: Ecology
Community Ecology
Review
A
is a collection of
of various
species
that can
interact.
Competition may result in character
where certain characteristics exhibit more divergence between
populations of two species than between
populations
of the same two
species.
Predation occurs when one species, the
, kills and eats the other, the
.
Predator
adaptations include
,
,
fangs,
, and
.
Prey adaptations include
coloration,
coloration,
coloration,
Batesian
or
Müllerian
, and
chemical
defenses such as
.
Parasitism is a relationship where one organism, the
, benefits by
harming
another organism, its
.
interactions, or
symbiosis,
benefit both species.
benefits
one species while the other is not
affected.
species
are the most abundant, or have the highest
, in a community. The diversity of some communities is dependent on one
species.
Some organisms act as
species
by causing physical changes in the environment and can act as
of biodiversity in the community.
Natural communities experience
periodic
such as
storms,
fires,
, and
. Species in the community are
to such
disturbances,
and often such disturbances are a
necessity
to maintain its biodiversity.
After a disturbance, the community may change in a process called ecological
.
succession
occurs where no soil exists when succession
begins.
succession
begins in an area where soil remains after a disturbance.
The number of species in many communities follows a
curve.
Island
predicts the species richness of isolated ecosystems based on island
, distance from the mainland, and
and
rates.
Animations
Movies
Words
Appendix
Summary
Art
Art
Chapter
55
Quizzes:
Self
Activities
Chapter
Cum.
Unit 8: Ecology
Conservation Biology and Restoration Ecology
Review
Human activities are destroying and degrading natural
ecosystems,
resulting in the
loss
of
and the
of
species.
Most species
loss
can be traced to four major threats:
Habitat
and
reduces
biodiversity.
Many species require large habitats due to the
effect.
species
can displace native species and disrupt their adopted
communities.
can
reduce
population size and reduce
diversity.
Disruption of
networks,
especially if the exploited species is a
species
or
species.
Conserving endangered and threatened species:
Small-population approach: a small population is prone to
-feedback loops that draw the population down an
vortex.
Declining-population approach: study populations that show a
trend, and take proactive
strategies
to halt the decline.
Landscape ecology and ecosystem management:
Boundaries
between natural ecosystems are called
and are zones of rich biodiversity, but artificial
edges
often
and deteriorate ecosystems.
Establishing
areas,
especially in
spots
of
biodiversity.
Large, pristine
nature
are rare;
reserves
are an alternative in heavily populated areas.
ecology attempts to restore
degraded
ecosystems to a more natural
state.
development
seeks to improve living
standards
while conserving biodiversity. Ultimately, the drive for
conservation
may be based on
.
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