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Chapter 36: Problem 16

Define carrying capacity of a population and explain whether it changes or remains fixed for a population. a. Carrying capacity is the amount of land needed to support a population, and it is fixed for each population. b. Carrying capacity is the amount of water and food resources required to support a population and it is fixed for each population. c. Carrying capacity is the maximum size of a population that can survive using the available resources and it can vary up or down. d. Carrying capacity is the time needed for a population to reach its maximum size and it can vary up or down.

Short Answer

Expert verified
Carrying capacity is the maximum size of a population that can survive using the available resources and it can vary up or down.

Step by step solution

01

- Understanding Carrying Capacity

Carrying capacity refers to the maximum number of individuals in a population that the available resources of an environment can sustain indefinitely.
02

- Identifying the Correct Definition

Review the given options and identify which one accurately describes carrying capacity. The correct option should define carrying capacity as related to resource availability and population size.
03

- Analyzing Each Option

Option (a) incorrectly defines carrying capacity as a fixed amount of land needed for support. Option (b) incorrectly ties it to water and food resources required in a fixed manner. Option (d) incorrectly describes carrying capacity as related to time. Option (c) correctly defines carrying capacity as the maximum size of a population that can survive with available resources and acknowledges it can vary.
04

- Conclusion

With the analysis completed, option (c) is correct as it aligns with the correct definition and acknowledges that carrying capacity can change based on resource availability.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Population Dynamics
Population dynamics explore how populations change over time, including size, structure, and distribution. These changes are influenced by birth rates, death rates, immigration, and emigration.
Understanding population dynamics helps scientists predict future changes and manage resources effectively.
Several factors can affect population dynamics:
  • Birth and Death Rates: The number of births and deaths in a population significantly influences its size. High birth rates increase population size, while high death rates decrease it.
  • Immigration and Emigration: Immigration adds individuals to a population, while emigration removes individuals. This movement can alter population size and genetic diversity.
  • Environmental Factors: Changes in the environment, such as natural disasters or human activities, can impact population size and dynamics by altering habitat and resource availability.
Population dynamics are crucial for understanding ecological balance and managing ecosystems sustainably.
Resource Availability
Resource availability is key to a population's survival and growth. It includes all the necessary resources like food, water, shelter, and space essential for living organisms.
91影视 can be classified into:
  • Renewable 91影视: These are replenished naturally, such as sunlight, water, and plants. Proper management ensures their sustained availability.
  • Non-renewable 91影视: These have limited availability and cannot be replenished quickly, like fossil fuels and minerals. Overuse can lead to depletion.
Population size directly correlates with resource availability. When resources are plentiful, populations can grow. However, if resources become scarce, populations may decline.
Efficient use and management of resources are vital to maintaining ecological balance and supporting populations at their carrying capacity.
Ecological Balance
Ecological balance is the equilibrium between living organisms and their environment. It ensures the sustainable co-existence of different species within an ecosystem.
This balance is achieved through:
  • Food Chains and Webs: Energy flows from one organism to another, maintaining a balance of population sizes among species.
  • Predator-Prey Relationships: Predators control the population of prey species, preventing overpopulation and depletion of resources.
  • Competition and Cooperation: Species compete for resources, but some also cooperate, such as pollinators and plants, which ensure mutual survival.
Human activities like deforestation, pollution, and climate change can disrupt ecological balance, leading to biodiversity loss and ecosystem collapse.
Protecting natural habitats and sustainable resource use are essential for preserving ecological balance.
Population Growth Limits
Population growth limits are determined by factors that stabilize the size of a population. These include:
  • Carrying Capacity: It is the maximum population size that an environment can sustain indefinitely with available resources. When the population exceeds carrying capacity, resources become overused, leading to a decline in population size.
  • Limiting Factors: Factors such as food, water, and space that restrict population growth. When any of these resources are scarce, they limit population size.
  • Density-Dependent Factors: Factors influenced by population density, like disease, competition, and predation. Higher densities can lead to increased stress and resource depletion, reducing population growth.
  • Density-Independent Factors: Factors not influenced by population size, like natural disasters or extreme weather events. These can reduce populations regardless of their size.
Understanding these limits helps in creating strategies for sustainable population management and resource conservation.

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Most popular questions from this chapter

Species with limited resources usually exhibit a(n) ____ growth curve. a. logistic b. logical c. experimental d. exponential

An ecologist is planning to measure both the size and density of a population. Identify the experimental method that can best provide these data. a. mark and recapture b. mark and release c. quadrat d. life table

\(\begin{array}{|c|c|}\hline \text { Date } & {N} \\ \hline 5 / 1 /12 & {56} \\\ \hline 6 / 1/12 & {98} \\ \hline 7 / 2 / 12 & {203} \\ \hline 8 / 10 / 12 & {421} \\ \hline\end{array}\) These data were collected on a population of beetles in Florida. Based on the data, how would you describe population growth in this case and what do you predict about growth of this population in the future? Explain your reasoning. a. Population shows logistic growth, as number of individuals doubles every month and will likely continue to grow logistically until its resources become depleted. At that point, the population growth rate will slow down and level off to zero. b. The population shows exponential growth, as the number of individuals doubles every month and will likely grow logistically in the future when the resources become limited. At that point, the population growth rate will slow down and level off to zero. c. The population shows exponential growth, as number of individuals doubles every month and will likely continue to grow exponentially until its resources become limited. At that point, the growth will become logistic; the population growth rate will slow down and level off to zero. d. The population shows logistic growth and is likely to grow exponentially as the resources are probably increasing. The population growth rate will increase in the future as well.

A flask of nutrient broth, buffered to maintain pH, is inoculated with a strain of E. coli. The flask is placed in a constant temperature environment where it is aerated by shaking. A. Predict the effect of a change in energy availability over time. B. Represent the change graphically in terms of the number of cells as a function of time. C. In your graph as time progresses there is a change in the growth rate of the population. Add annotation to your graph to describe the time interval during which the growth rate is increasing linearly in proportion to the number of cells. Add annotation to your graph to describe another time interval during which the growth rate is decreasing in proportion to the square of the number of cells. Add a third annotation to describe an interval of time where the rate of growth is zero. D. Select and justify two measurements of the E. coli population that could be made at two different points in time during growth that would be sufficient to answer questions about the population size at any time. E. Describe the population of E. coli if the environment was continuously supplement by additional nutrient broth.

Honey bees are pollinators. Identify the type of symbiotic relationship that exists between honey bees and flowering plants, and explain why your reasoning. a. This is commensalism because bees help plants pollinate and, in turn, obtain nectar from the plants. b. This is a mutualistic relationship, because bees obtain nectar from the plants, but do not provide any benefits to the plants. c. This is commensalism, because bees obtain nectar from the plants, but do not provide any benefits to the plants. d. This is a mutualistic relationship, because bees help plants pollinate and, in turn, obtain nectar from the plants.
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