Animations
Movies
Words
Appendix
Summary
Art
Art
Chapter
51
Quizzes:
Self
Activities
Chapter
Cum.
Unit 8: Ecology
Behavioral Ecology
Review
is the study of animal
behavior,
the
response
of an animal to a
. A behavior may have
("how") and
("why") causes.
Innate behaviors are
determined and include siimple movement such as
, and
, an
oriented
movement toward or away from a stimulus. A
action pattern (FAP) is triggered by an external
stimulus.
More complex behaviors such as
migration
in birds are also largely genetically programmed.
Animals communicate by using
, behaviors that cause a change in another animal's behavior.
signals
include
that allow communication through
.
signals
control courtship behaviors of many insects and birds.
Many animals exhibit
during an early stage of development called the
period,
when they can
basic survival knowledge such as the
identity
of their parents or
.
occurs when behaviors are modified based on specific
experiences.
conditioning
is a type of
learning in which a stimulus is associated with a
(reward or punishment).
conditioning
occurs when an animal learns to associate a
with a
.
Mating
behavior includes
,
, and
. In many species, females choose their mate in a process called
selection, or
choice.
Males often
for females in a process called
selection that can
variation among males and involve
behavior.
fitness extends the theory of
selection to explain
social
behavior,
or
selection: an individual can proliferate its
by producing its own
or offspring of close relatives.
The selective advantage of altruism can be quantified by measuring
The
to the recipient (
B
)
The
to the altruist (
C
)
The
of
relatedness
(
r
)
Natural selection favors
altruism
when
rB > C
(
rule).
Animations
Movies
Words
Appendix
Summary
Art
Art
Chapter
52
Quizzes:
Self
Activities
Chapter
Cum.
Unit 8: Ecology
Population Ecology
Review
A
is a group of individuals of a single
living in the same
area.
Population
(number of individuals per area or volume) results from
and
of
individuals;
this may change over time as
reflected
in the population's
.
A population may
exhibit
,
,
or
dispersion
patterns, often delineated by
boundaries.
In a closed population (no
and emigration), the rate of population growth can become
, exhibiting a
curve,
when the
rate exceeds
rate for extended periods.
Eventually this growth slows to a
growth when the
capacity
(K) of the environment is approached, resulting in a
(S-shaped) curve.
The finite resources available may lead organisms to make
trade-offs
between
and
, reflected in their
history traits. Some species exhibit
, or "big-bang"
reproduction,
reproduce a single time and die, instead of the repeated reproduction of species that exhibit
.
The human
population
increased slowly until about
and then began to grow
, until mid-20th
century.
Local populations tend to undergo a
transition
from high birth and death rates to low ones as economies develop. The regional growth patterns are reflected in
structure
diagrams.
Graph It:
Age Pyramids and Population Growth
The
capacity of Earth for humans is uncertain, but can be estimated by the
footprint
of different populations. At more than 6
billion
people, the biosphere is already in ecological
.
What is
your
ecological
footprint?
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Dec 7, 2006
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