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Chapter 36: Problem 13

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

Short Answer

Expert verified
a. logistic

Step by step solution

01

- Understand the Problem

Identify the key phrase 'species with limited resources' to recognize that the problem relates to population growth under resource constraints.
02

- Know the Types of Growth Curves

Familiarize with the two main types of population growth curves: exponential and logistic. Exponential growth occurs when resources are unlimited, leading to rapid population growth. Logistic growth occurs when resources are limited, and population expansion is slowed by carrying capacity.
03

- Associate Concept with Terms

Match the term 'limited resources' with the appropriate type of growth curve. Logistic growth accounts for limited resources and an eventual plateau as the population reaches carrying capacity.
04

- Choose the Correct Answer

Recognize that the appropriate growth curve for species with limited resources is the logistic growth curve, making the correct answer 'a. logistic'.

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Key Concepts

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

population growth
Population growth refers to how the number of individuals in a population increases or decreases over time. Several factors can affect this growth, such as birth rates, death rates, immigration, and emigration. Population growth is typically represented in two primary ways:
  • Exponential Growth: This growth happens when resources are abundant, and each individual can reproduce at its maximum rate. Exponential growth leads to a rapid increase in population size, often displayed in a J-shaped curve.
  • Logistic Growth: This form occurs when resources are limited, causing the growth rate to slow down as the population size reaches the carrying capacity of the environment. This is represented in an S-shaped curve, as the population increases rapidly at first and then levels off.
Understanding these models helps predict how populations will change over time and the potential impacts on ecosystems and resources.
carrying capacity
Carrying capacity is a crucial concept in ecology and population biology. It refers to the maximum number of individuals an environment can sustain indefinitely without degradation. Several factors determine the carrying capacity of a habitat:
  • Resource Availability: Food, water, shelter, and other essentials impact how many individuals an environment can support.
  • Waste Accumulation: The environment's ability to process waste products without becoming toxic is important for the long-term survival of the population.
  • Interactions Among Organisms: Predation, disease, and competition among species can influence a population's size and the habitat's carrying capacity.
Once a population reaches its carrying capacity, its growth rate slows and stabilizes. This results in a logistic growth curve, where the population size levels off, forming the characteristic 'S' shape.
resource limitations
Resource limitations refer to the constraints placed on a population's growth due to finite resources in the environment. These limitations can include food, water, space, and other necessary environmental components for survival. Here's why resource limitations are important:
  • Population Regulation: Limited resources prevent a population from growing indefinitely, helping maintain ecological balance.
  • Competitive Interactions: Organisms may compete for scarce resources, which can lead to natural selection and evolutionary changes.
  • Sustainability: Understanding resource limitations helps us manage and conserve ecosystems, ensuring species' survival and environmental health.
Logistic growth reflects how populations behave under resource limitations. The population initially grows swiftly, but as resources become scarce, growth slows and eventually halts when carrying capacity is reached.

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Most popular questions from this chapter

Fruit flies are found in many different areas in the world. Fruit flies that are resistant to cold temperatures tend to have decreased fecundity at early ages compared to flies that are not capable of surviving the cold. Explain a likely reason for why this set of traits is observed. (credit: Anthony Zera Publications) a. Flies having traits that traded early reproductive energy for greater storage of energy in their bodies were favored via natural selection because they survived the cold better than flies that did not have these traits. b. In cold conditions, flies have less need for reproduction than in warm conditions and so energy normally used for reproduction is diverted to other survival functions. c. Flies respond to weather conditions to shift their energy resources to either storage in their bodies in the cold or to reproduction when conditions become warm again. d. All fruit flies have the same genetic makeup, but express different patterns of genes under different conditions, which results in expression of certain genes for cold conditions and others for warm conditions.

Describe phototaxis. a. Phototaxis is the directed movement of an organism in response to gravity. b. Phototaxis is the long-range movement of an organism in response to a change in season. c. Phototaxis is the movement of an organism in search of food. d. Phototaxis is the directed movement of an organism in response to light

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.

Explain why the concept of carrying capacity is important when discussing human population growth. a. Humans can decrease the carrying capacity of their environment by developing food production methods and engineering high quality shelters, which enables more people to live than would otherwise be possible. b. Humans have been able to change the carrying capacity of their environment, which enables more people survive. By decreasing their own carrying capacity, humans are responsible for their population boom. c. Humans have been able to change the carrying capacity of their environment, which enables more people to live. By increasing their own carrying capacity, humans are responsible for their population boom. d. Humans can increase the carrying capacity of their environment by developing food production methods and engineering high quality shelters, which enables fewer people to live than would otherwise be possible. This would result in population collapse.

Compare and contrast density-dependent growth regulation with density- independent growth regulation. Give an example of each as they might affect a caterpillar population. a. Both are environmental conditions that result in changes in population numbers. Densityindependent factors have different effects on population densities whereas density-dependent factors have the same effect. An example of the former is a caterpillar population being kept low by a pesticide because it kills them regardless of their numbers. In the case of the latter, a large caterpillar population leads to a decrease in food availability, which will cause the caterpillar population to decline. b. Both are environmental conditions that result in changes in population numbers. Densityindependent factors have the same effect at all population densities whereas density-dependent factors have different effects. An example of the former is of a caterpillar population being kept low by a pesticide because it kills them regardless of their numbers. In the case of the latter, a large caterpillar population leads to a decrease in food availability, which will cause the caterpillar population to decline. c. Both are environmental conditions that result in changes in population numbers. Densityindependent factors have the same effect at all population densities whereas density-dependent factors have different effects. An example of the former is of a caterpillar population being kept low by a pesticide because it kills them when their numbers are low. In the case of the latter, a large caterpillar population leads to a decrease in food availability, which will cause the caterpillar population to decline. d. Both are environmental conditions that result in changes in population numbers. Densityindependent factors have the same effect at all population densities whereas density-dependent factors have different effects. An example of the former is of a caterpillar population being kept low by a pesticide because it kills them regardless of their numbers. In the case of the latter, a large caterpillar population leads to a decrease in food availability, which will cause the caterpillar population to increase
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