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Chapter 53: Q14TYU (page 1188)

Interactions In a short essay (100鈥�150 words), identify the factor or factors in Figure 53.18 that you think may ultimately be most important for density dependent population regulation in humans, and explain your reasoning

Short Answer

Expert verified

Competition among the population, predation, disease, parasites, and waste buildup influence population density. The size of a population may be influenced by factors that depend on population density.

When population density rises, density-dependent mechanisms diminish birth rates or increase death rates. As population size increases, these limiting factors rise and limit growth.

Step by step solution

01

Human population

Populations are groups of people and are defined in sociology as groups. The number of people living in a city, a region, a nation, or the entire planet is referred to as a population.

The population's size, distribution, and composition are all continually changing. Population dynamics research looks at how populations change in size and design over time.

02

Population density

Population density refers to the number of individuals of a species in a particular geographic area.Population density can calculate demographics and examine the interactions of ecosystems, human health, and infrastructure.

03

Factors affecting population density

Completion - With increasing population density, competition for resources and nutrition increases, lowering reproduction rates.

Predation and diseases - As a population grows denser, disease transmission and predation rate increase.

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To estimate which age cohort in a population of females produces the most female offspring, you need information about the number of offspring produced per capita within that cohort and the number of individuals alive in the cohort. Make this estimate for Belding鈥檚 ground squirrels by multiplying the number of females alive at the start of the year (column 2 in Table 53.1) by the average number of female offspring produced per female (column 5 in Table 53.1). Draw a bar graph with female age in years on the x-axis (0鈥�1, 1鈥�2, and so on) and total number of female offspring produced for each age cohort on the y-axis. Which cohort of female Belding鈥檚 ground squirrels produces the most female young?

A population鈥檚 carrying capacity

(A) may change as environmental conditions change.

(B) can be accurately calculated using the logistic growth model.

(C) increases as the per capita population growth rate decreases.

(D) can never be exceeded.

Some people regard the rapid population growth of less industrialized countries as our most serious environmental problem. Others think that the population growth in industrialized countries, though smaller, is actually a greater environmental threat. What problems result from population growth in (a) less industrialized countries and (b) industrialized nations? Which do you think is a greater threat, and why?

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