Population Flashcards
vital statistical data that describe the population.
t demographics –
Number of individuals in a population
POPULATION SIZE
Number of members of a population in a given area (Population / area)
POPULATION DENSITY
Describes where individuals are and where are the others.
PULATION DISTRIBUTION
Population Size
- Usually symbolized as
N
Large populations may be? than smaller population
more stable
Applied for immobile organisms such as plants or very small and slow-moving organisms.
Plots called ? are used to determine the population size and even density.
quadrats
- A quadrat can be made by staking out an area with sticks and string or by using a wood, plastic, or metal square placed on the ground
This technique is for organisms that move around
Mark-recapture Method
Method Involves capturing a sample of animals and marking them in some way—for instance, using tags, bands, paint, or other body markings.
Mark-recapture
Then, the marked animals are locked up for further experimantations. T or f
F
Members are closer to each
other because of an
essential resource.
Clunped
Most common dispersion
Clumped
Hippopotamuses in muddy
river,
Clumped
Individuals are evenly - spaced out.
Uniform
- The result of competition in resources.
Uniform
- Competition among
water root system
Uniform
Rare, only occurs if the resources is uniformly available and the proximity of resource to others does not matter.
Ramdom
Dandelions
Random
explains how fast a given population grows.
population growth rate (PGR)
the number of individuals born
• Natality -
the number of deaths that occur
in the population during a given time period
Mortality
Moving away
emigration
Moving in
birth rate exceeds its death rate.
Exponential
If its per capita growth rate is constant
Exponential
Unli resouces
Exponential
T he number of organisms added in each generation—increases as the population gets larger
Expo
J shape
Expo
Limited resources
Logistic
number of individuals gets large enough
Logistic
maximum number of individuals that a particular environment can sustain indefinitely
Carryingcapacityisthe
S shape
Logistic
Real life
Logistic
Fake
exponential
Density dependent
Biotic
Density independet
Abaiotic