Which statement best describes how the data are collected to produce a cohort life table (also called a dynamic life table)? Track a group of females born at approximately the same time throughout their entire lives. Track all females in a population across multiple generations. Track all females within a population for a fixed amount of time that is shorter than the lifespan of the individuals. Track all individuals in the population for a fixed period of time.

Which statement best describes how the data are collected to produce a cohort life table (also called a dynamic life table)? Track a group of females born at approximately the same time throughout their entire lives. Track all females in a population across multiple generations. Track all females within a population for a fixed amount of time that is shorter than the lifespan of the individuals. Track all individuals in the population for a fixed period of time.

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter19: Population And Community Ecology

Section: Chapter Questions

Problem 5RQ: Which of the following is best at showing the life expectancy of an individual within a population?...

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The following equation is used to calculate the population growth rate, Ro, per generation from a life table. Iy is survival probability from birth to age x and my is fecundity at age x. Ro = Elkm Multiplying ly and my and summing it over all age categories in the life table gives the population growth rate per generation because: Calculating the reproductive output for each age class requires considering the survival probability to that age (a dead individual does not reproduce) and the fecundity at that age by multiplying them with each other. Summing over reproductive output for all age classes gives the total per capita growth rate of the population The fecundity at each age is lower when the survival is higher because of energy constraints. Multiplying probability of survival and fecundity in each age class takes this trade-off into account. Summing over reproductive output for all age classes gives the total per capita growth rate of the population The resulting type of growth…
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Two stable populations employ the same fertility schedule, but different mortality schedule. In both populations, 20% of women between exact ages 45-55 bear a female child annually. No child bearing occurs outside this span. In population A, there is no mortality until age 100 where all who reached age perish. In population B, 1% of each cohort dies within each single year of age with no survivors beyond age 100. Compute GRR, GRR and r for each population. ii) Determine the birth and death rate of each. Sketch the age distribution of each.
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