Populations Ch. 19
A random distribution of individuals in a population would be most likely to result from
The dispersal of seeds by wind
Population
A group o organisms that belong to the same species and live in a particular place at the same time
A population is likely to grow most rapidly if it has
A high percentage of young individuals
Logistic model
A population growth model in which exponential growth is limited by the carrying capacity
Which of the following is not a threat to survival of small populations? A) breeding in captivity B) inbreeding C) habitat destruction D) disease out breaks
A) breeding in captivity
Death rate
Also know as morality rate and number of deaths in a time period
Limiting factors
Any factor, such as space that restrains the growth of a population
The current population growth rates of developed countries
Are lower than those of developing countries
Density dependent factors
As populations grow, the limited resources get used up and affects the whole group that has same issues in their own areas
The country may have a negative growth rate if it's
Death rate is higher than its birth rate
Density independent factors
Factors such as natural disasters that reduce a population by the same portion regardless of population size and affect only thee population in the given are that experiences change
Although the United States has a larger total population than Japan, population density is greater in japan because
Geographical area is greater in the us
Birth rate - death rate =
Growth rate
The hunter-gather lifestyle is associated with
High morality rates among infants and young children
Life expectancy
How long on average an individual is expected to live
Hunter gatherer lifestyle
Hunting animals and gathering roots
The global growth rate of the human population is
Increasing but at a slower rate than in the mid-1960s
Immigration
Is the movement of individuals into a population
Emigration
Is the movement of individuals out of a population
In a population with type 1 survivorship curve, the likelihood of dying is
Low until late in life, when it increases rapidly
Demographic model
Model shows population changes
Population density
Number of individuals that live in a given area
The exponential model of population growth
Reflects the fact that the birth rate decrease as population grows
One example of a density dependent limiting factor is a
Shortage of nesting sites
Survivorship curve
The 3 different curves to morality data of different species
About 10000 to 120000 years ago, the human population began to grow more rapidly due to
The agricultural revolution
Birth rate
The number of births occurring in a time period
Population size
The number of individuals in a population
Carrying capacity
The population that an environment can sustain with the right amount of resources
Dispersion
The way I individuals of the population a e arranged in space
Agricultural revolution
When humans began to domesticate animals
Exponential model
When the rate of population growth stays the same and population size is plotted against time on a graph and cure resembles a j shaped curve
One can estimate a population's size by counting individuals in a sample of the population if the
distributuon of individuals in the sample is the same as that in the population