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Chapter 36: Problem 20

Species that have many offspring at one time are usually _______. a. r-selected b. K-selected c. both r- and K-selected d. not selected

Short Answer

Expert verified
a. r-selected

Step by step solution

01

- Understand r-Selected Species

r-Selected species are species that produce a large number of offspring in a relatively short period. These species often have high growth rates, and their populations tend to grow rapidly. Common characteristics include early maturity, high fecundity, and minimal parental care.
02

- Understand K-Selected Species

K-Selected species, on the other hand, produce fewer offspring. These species invest more resources in each offspring, which generally leads to higher survival rates. They often have longer lifespans, larger body sizes, and extensive parental care.
03

- Compare Options

Compare the key characteristics of r-Selected and K-Selected species with the given options. Since the species in the question produce many offspring at one time, this aligns with the characteristics of r-Selected species.
04

- Choose the Correct Answer

Based on the comparison, the species that produce many offspring at one time are typically r-Selected species. Therefore, the correct option is 'a. r-selected'.

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Key Concepts

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

Reproductive Strategies
Reproductive strategies refer to the different methods species use to reproduce and ensure the survival of their offspring. There are two main types of reproductive strategies: r-selected and K-selected strategies.

  • r-selected species: These species focus on high reproduction rates. They produce many offspring, often without much parental care. This strategy helps them quickly take advantage of favorable conditions.
  • K-selected species: These species invest more in their fewer offspring. They provide significant parental care, which increases the survival rate of each offspring.
Reproductive strategies are crucial for the survival and continuation of species. They determine how a species adapts to its environment and evolves over time.
Population Ecology
Population ecology is the study of how populations of species interact with their environment and how these interactions affect population size and composition.

Populations are dynamic. They change in response to various factors, including food availability, predation, disease, and competition. There are two main population growth models:

  • Exponential growth: Occurs when resources are abundant, leading to rapid population increase. This is typical for r-selected species.
  • Logistic growth: Occurs when resources are limited, leading to a population size that stabilizes near the environment's carrying capacity. This is typical for K-selected species.
Understanding population dynamics helps in conservation efforts and resource management, ensuring species can thrive sustainably.
Species Survival
Species survival depends on various factors, including reproductive strategies and environmental interactions. r-Selected species and K-selected species have different approaches to ensuring their survival:

  • r-Selected species produce many offspring but have a lower survival rate for each individual. This method works well in unpredictable environments where the chances of survival are low.
  • K-Selected species produce fewer offspring, but each has a higher chance of survival due to substantial parental investment. This strategy is effective in stable environments where competition for resources is high.
Both strategies have their advantages and disadvantages. r-Selected species can rapidly colonize new areas and recover quickly from population declines, while K-selected species often maintain more stable populations and achieve higher long-term survival rates.

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Most popular questions from this chapter

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\(\begin{array}{|c|c|}\hline \text { Date } & {N} \\ \hline 5 / 1 /12 & {56} \\\ \hline 6 / 1/12 & {98} \\ \hline 7 / 2 / 12 & {203} \\ \hline 8 / 10 / 12 & {421} \\ \hline\end{array}\) 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.
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