, Population Ecology
General Definitions
·
individual :
a single organism capable of independent existence
species group of similar characteristics which interbreed v to produce fortle offspring
·
:
organisms with can
habitat specific type of environmentlarea vin which animal normally occurs
plant or
:
a a species
·
population
: a
group of organisms of the same species- that occur in a
particular a re a v at a particular time so
that interbreeding v can occur
of a re a
community group populations - occuring a
particular
:
in
·
·
ecosystem
: interaction between blotic factors and abiotic factors -
In a particular area v
ecology : the study of mutual interaction among living organisms
-
and the environment v in which they live
population size : number of individuals v in a population
population density :
the number of individuals r of the population per cit are a
Population Parameters
·
Natality :
birth rate of a population expressed as no of live births per 1000 individuals per year
.
death rate of population expressed as no of deaths individuals
mortality a per 1000 per
·
year
: .
of individuals population
migration movement
:
of
·
in +out a
immigration one movement of organisms intoo n area
way
:
emigration : one
way movement of organisms out ofo n area
growth r a te :
change in total population per unit time
·
sex ratio :
no . Of organisms of each sex
Impact of Population Parameters :
natality
+
Immigration cause pop. 4.
I
mortality +
emigration cause pop
·
.
no migration in a closed pop leg Island :
↳ affected
pop only by natality +
mortality
Population Regulation Factors
1 .
Density Dependent
food t water supply
disease a parasites a Interspecific : diff species
competition when I individuals compete for short
supply
:
t resources
·
in
predation :
animals of 1 species kill + feed directly on another species intraspecific : some species
4 Fitness of controlled Cold weak killed
+ no ·
prey +
↳ always ↑
prey) predator ; ↓ pred =
Prey
·
space + shelter
.
2 Density Independent
·
Climate Crainfall ; temp)
pollution
·
catastrophic events
·
·
environment conditions (humidity ,
acidity , salinity)
General Definitions
·
individual :
a single organism capable of independent existence
species group of similar characteristics which interbreed v to produce fortle offspring
·
:
organisms with can
habitat specific type of environmentlarea vin which animal normally occurs
plant or
:
a a species
·
population
: a
group of organisms of the same species- that occur in a
particular a re a v at a particular time so
that interbreeding v can occur
of a re a
community group populations - occuring a
particular
:
in
·
·
ecosystem
: interaction between blotic factors and abiotic factors -
In a particular area v
ecology : the study of mutual interaction among living organisms
-
and the environment v in which they live
population size : number of individuals v in a population
population density :
the number of individuals r of the population per cit are a
Population Parameters
·
Natality :
birth rate of a population expressed as no of live births per 1000 individuals per year
.
death rate of population expressed as no of deaths individuals
mortality a per 1000 per
·
year
: .
of individuals population
migration movement
:
of
·
in +out a
immigration one movement of organisms intoo n area
way
:
emigration : one
way movement of organisms out ofo n area
growth r a te :
change in total population per unit time
·
sex ratio :
no . Of organisms of each sex
Impact of Population Parameters :
natality
+
Immigration cause pop. 4.
I
mortality +
emigration cause pop
·
.
no migration in a closed pop leg Island :
↳ affected
pop only by natality +
mortality
Population Regulation Factors
1 .
Density Dependent
food t water supply
disease a parasites a Interspecific : diff species
competition when I individuals compete for short
supply
:
t resources
·
in
predation :
animals of 1 species kill + feed directly on another species intraspecific : some species
4 Fitness of controlled Cold weak killed
+ no ·
prey +
↳ always ↑
prey) predator ; ↓ pred =
Prey
·
space + shelter
.
2 Density Independent
·
Climate Crainfall ; temp)
pollution
·
catastrophic events
·
·
environment conditions (humidity ,
acidity , salinity)
