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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

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

Give an example of exponential population growth. a. salamanders adapting to fungal infections b. polar bears living in a warming habitat c. bacteria growing in enriched medium in a lab d. feral cats being trapped and neutered in a suburb

Which explanation best defines density-dependent growth regulation? a. a factor that affects population density but not population size b. a factor that affects population size but not population density c. a factor that affects population size regardless of population density d. a factor that affects population size in ways related to population density

What is the difference between innate and learned behaviors? a. Innate behaviors can change based on previous experiences, whereas learned behaviors remain the same throughout an organism鈥檚 life. b. Innate behaviors are controlled by genes, whereas genes play no role in learned behaviors. c. Innate behaviors allow an organism to adapt to new situations by applying previous experiences, whereas learned behaviors allow an organism to respond quickly. d. Innate behaviors are involuntary responses to stimuli, whereas learned behaviors change based on an organism鈥檚 experiences.

A researcher has been tracking a population of turtles. The researcher marked 200 young turtles just after hatching. A year later, collection data reveal that about 80% survived. A year after that, collection data revealed that about 60% of the original group was still living. After a third year, about 40% could be found alive. What do these data say about the survivorship curve that would best describe this population? Explain your reasoning. a. Type II survivorship curve because the number of survivors decreases by the same value (20%) every year. b. Type I survivorship curve because the number of survivors decreases by the same value (20%) every year. c. Type II survivorship curve because the number of survivors increases by the same value (20%) every year. d. Type IV survivorship curve because the number of survivors decreases by the same value (20%) every year.
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