9. Identify at least two factors that influence the degree of stochasticity in birth and death rates
for a species/population of your choosing. Identify the species/population and tell us which
factors and why those factors affect stochasticity.
9. Identify at least two factors that influence the degree of stochasticity in birth and death rates
for a species/population of your choosing. Identify the species/population and tell us which
factors and why those factors affect stochasticity.
Solution
Environmental fluctuations: a major factor that influences the degree of stochasticity in birth and
death rates for a species, result in changes in high to low birth & death rates that cause higher
alteration in stages of demographic transition. For example, a majority of bird species &
butterflies have undergone extinction due to \"industrial revolution followed by the degree of
stochasticity in birth and death rates of species\" finally triggered environmental fluctuation
Inbreeding depression: this is leading to low fitness finally trigger that influence the degree of
stochasticity in birth and death rates for a species/population. Inbreeding results in decreased
heterozygous alleles and increase in homozygous alleles. This results in increased chances of
inheriting the deleterious alleles or the recessive alleles, which would cause increase in genetic
disorders and decrease in allelic diversity finally low level of birth rate to death rate
Immigration/emmigration events:
the total population changes with immigration & emigration events in a particular area or country
based on pre-industrial, environmental, natality & moratility rates and the population growth
(influence the degree of stochasticity in birth and death rates) and reduction are both explained in
5 stages of model.
The major comparison of stage II is to a country in stage IV, “growth rate is higher in stage II
due to higher sanitation and higher food supply as a result higher life expectancy & low infant
mortality compared to the growth rate and fertility rate observed in stage IV. Stage IV is
composed of population with life expectancy is lower compared to stage II as a result both birth
rate & death rate are lower. This is leading to proportion of the population less than 15 years of
age in stage IV (low demographic transition) with low economy compared to stage II finally
result in low fertility of population with inadequate food sources in the population..
9. Identify at least two factors that influence the degree of stoc.pdf
1. 9. Identify at least two factors that influence the degree of stochasticity in birth and death rates
for a species/population of your choosing. Identify the species/population and tell us which
factors and why those factors affect stochasticity.
9. Identify at least two factors that influence the degree of stochasticity in birth and death rates
for a species/population of your choosing. Identify the species/population and tell us which
factors and why those factors affect stochasticity.
Solution
Environmental fluctuations: a major factor that influences the degree of stochasticity in birth and
death rates for a species, result in changes in high to low birth & death rates that cause higher
alteration in stages of demographic transition. For example, a majority of bird species &
butterflies have undergone extinction due to "industrial revolution followed by the degree of
stochasticity in birth and death rates of species" finally triggered environmental fluctuation
Inbreeding depression: this is leading to low fitness finally trigger that influence the degree of
stochasticity in birth and death rates for a species/population. Inbreeding results in decreased
heterozygous alleles and increase in homozygous alleles. This results in increased chances of
inheriting the deleterious alleles or the recessive alleles, which would cause increase in genetic
disorders and decrease in allelic diversity finally low level of birth rate to death rate
Immigration/emmigration events:
the total population changes with immigration & emigration events in a particular area or country
based on pre-industrial, environmental, natality & moratility rates and the population growth
(influence the degree of stochasticity in birth and death rates) and reduction are both explained in
5 stages of model.
The major comparison of stage II is to a country in stage IV, “growth rate is higher in stage II
due to higher sanitation and higher food supply as a result higher life expectancy & low infant
mortality compared to the growth rate and fertility rate observed in stage IV. Stage IV is
composed of population with life expectancy is lower compared to stage II as a result both birth
rate & death rate are lower. This is leading to proportion of the population less than 15 years of
age in stage IV (low demographic transition) with low economy compared to stage II finally
result in low fertility of population with inadequate food sources in the population.
