Concepts on Population

Concepts on Population
By Prof. Liwayway Memije-Cruz

Habitat
 natural
environment
where the
organism lives
 physical
environment
that surrounds
a population of
species

Geographic Range
distribution
of a
species
where the
species
can be
found

Ecological Niche
 the role and position
a species has in its
environment
 it is how it meets its
needs for food and
shelter, how it
survives, and how it
reproduces.

Demography
 the scientific study ofthe scientific study of
biological populationbiological population
 a general science that cana general science that can
be applied to any kind ofbe applied to any kind of
dynamic population that isdynamic population that is
one that changes over timeone that changes over time
or space.or space.
 encompasses the study ofencompasses the study of
the size, structure, andthe size, structure, and
distribution of populationsdistribution of populations
and spatial and or temporaland spatial and or temporal
changes in them in responsechanges in them in response
to birth, death, migration andto birth, death, migration and
ageing.ageing.

Population
 sum of all the
organisms of the
same group or
species, which live in
a particular
geographical area,
and have the
capability of
reproduction.

Population distribution
the spread of people across the world

Population density
 a measurement of population per unit area or unit
volume

Natality or Birth Rate
 the greatest factor that
influences population
increase.
 the inherent ability of
population to increase.
Maximum natality - the
absolute or theoretical
maximum production of new
individual under ideal
condition.
Ecological natality - the
population increase under
actual or environmental
conditions.


Mortality or Death Rate
 usually expressed as
the probability of
dying.
Minimum Mortality is
the loss of the
individual ideal
condition. Ecological
Mortality is the loss
of individual under
given environment.


Immigration
 the movement of people
into a destination country
to which they are not
native or do not possess
its citizenship in order to
settle or reside there, as
permanent residents or
naturalized citizens, or to
take-up employment as a
migrant worker or
temporarily as a foreign
worker.

Emigration
 act of leaving one's resident country with the intent to
settle elsewhere

Logistic Growth
 As a population increases in size, the same resources must be
shared by a greater and greater number of individuals. The
decreasing supply of resources may lower the birth rate, increase
the birth rate or both, thus population growth declines with
increasing density, eventually reaching a level at which population
growth ceases. The level is called carrying capacity and is
expressed as K of the environment. A sustainable supply of
sources including nutrients, energy and living spaces defines the
carrying capacity for a particular environment.
 Its rate of increase is low at first then accelerates and slows again,
then levels of as the carrying capacity of the environment is
reached. A plot of this growth pattern gives as a sigmoid or S-
shaped curve.

Exponential Growth
Population exhibit characteristic patterns
of increase known as population growth
forms.
Exponential growth is a pattern of growth
wherein the variables affect population
size and can be measured either for the
entire population or per individual.

Limiting Factors in Population

Chief Seattle’s quote
What ever befalls the earth?
Befalls the sons and daughters of the earth…
We did not weave the web of life;
We are merely a strand in it.
Whatever we do to the web,
we do to ourselves

Concepts on Population

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