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Chapter 36: Problem 76

A researcher studying minnows, a type of fish, kept two groups of 20 fish in separate containers. The containers were linked by a pair of small tubes outfitted with a pump that constantly circulated water between both tanks. The researcher observed both groups of fish after placing a larger fish known to be a predator of minnows into one of the tanks. Fish in both tanks demonstrated alarm behavior. How can you explain these observations? a. Fish in the tank that received the predator released alarm signals in chemical form. These compounds circulated and reached the other tank, eliciting an alarm response from the fish there nonetheless. b. Fish in the tank that received the predator released alarm signals in the form of electrical signals. These compounds circulated and reached the other tank, eliciting an alarm response from the fish there nonetheless. c. The predator introduced in one tank of fish released alarm signals in chemical form. These compounds circulated and reached the other tank, eliciting an alarm response from the fish there nonetheless. d. Fish in the tank that did not receive the predator released alarm signals in the chemical form. These compounds circulated and reached the other tank and elicited an alarm response from the fish.

Short Answer

Expert verified
a. Fish in the tank that received the predator released chemical alarm signals that circulated to the other tank.

Step by step solution

01

Understanding the Situation

There are two tanks of minnows connected by a pumping system that circulates water. A predator is introduced into one of the tanks. Both groups of fish exhibit alarm behavior.
02

Identify the Reason for Alarm Behavior

Recognize that the alarm behavior is influenced by the predator's introduction and the circulating water, which likely carries some form of alarm signal between the tanks.
03

Evaluate the Options

Analyze each option given:a. Fish release chemical alarm signals that circulate between tanks.b. Fish release electrical alarm signals that circulate between tanks.c. The predator releases chemical alarm signals that circulate between tanks.d. Fish in the non-predator tank release chemical alarm signals that circulate between tanks.
04

Consider Biological Mechanisms

Fish commonly use chemical signals, known as alarm substances, to communicate danger. Electrical signals are not typically used for this purpose.
05

Determine the Probable Source of the Alarm Signals

The fish exposed to the predator would be the ones releasing alarm signals to alert others. Options b and d can be ruled out because they don't align with common biological mechanisms.
06

Compare Remaining Valid Options

Between options a and c, the most logical choice is that the fish exposed to the predator released the alarm signals. Therefore, confirm that option a is correct.

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Key Concepts

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

Chemical Alarm Signals
Chemical alarm signals are critical for the survival of many aquatic species. When a fish detects a predator, it often releases certain chemicals into the water. These substances are known as 'alarm substances'.
For minnows, these chemicals are released from specialized cells when the skin is damaged by a predator's attack. This is a warning to other fish that there is danger nearby.
When water circulates between different tanks, these chemicals can spread. This is how fish in the non-predator tank can detect the threat and exhibit alarm behavior. Chemical signals mean fish don't need direct visual or physical contact with a predator to recognize danger.
This mechanism improves the survival rate of the group by allowing all individuals to respond quickly to a threat. It's important to note that not all species use the same chemicals. Each species has its unique set of alarm substances tailored to its environment and type of predators.
Behavioral Ecology
Behavioral ecology examines how animal behavior is influenced by ecological pressures. This field helps us understand why certain behaviors, like alarm signaling, have evolved.
In the case of minnows, their alarm behavior is a response to predation threats. When a predator is near, the release of alarm chemicals can be a life-saving act. This behavior has evolved because it increases the chances that related individuals will survive and reproduce.
Natural selection favors behaviors that enhance survival. For example, a minnow that fails to respond to alarm signals may be more likely to be caught by a predator. Behavioral ecology studies these interactions to understand how animals optimize their behavior in response to ecological challenges.
In the specific scenario of the exercise, the minnows' behavior clearly shows how crucial these alarm signals are for the survival of the species. By responding to chemical cues in the water, minnows demonstrate an adaptive strategy to avoid predation.
Predator-Prey Interactions
Predator-prey interactions are a fundamental aspect of ecosystems. They influence the population dynamics and the evolution of species.
In the given exercise, we see a direct example of such interactions. The presence of a predator triggers a cascade of behaviors that help prey species like minnows avoid being eaten. This relationship drives various adaptations in both predators and prey. Predators evolve strategies for catching prey, while prey evolve methods to escape.
Alarm signaling is one such adaptation among prey species. It serves to warn conspecifics (members of the same species) and even other species about potential danger. These interactions can shape the structure of aquatic communities.
For effective predator-prey interactions, communication is key. Chemical signaling in minnows is a sophisticated means of communication that enhances survival. Understanding these interactions helps ecologists manage ecosystems, conserve species, and predict how changes like introducing a new predator can impact the community.
This emphasizes the importance of understanding the complex behaviors driven by predator-prey dynamics in maintaining ecological balance.

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Most popular questions from this chapter

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.

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

Mammals such as humans show a behavior known as the flight or fight response. Explain how natural selection was likely involved in the development of this behavior that can be observed in humans today. a. Individuals showing fight or flight behavior was more likely to survive than individuals lacking the trait. This trait got randomly selected by natural selection, thus became preferentially incorporated into the human lineage. b. Individuals showing fight or flight behavior were more likely to survive than individuals lacking the trait. Sudden, inheritable changes were naturally selected, which included the fight or flight behavior. Thus, this response was incorporated into the human lineage. c. Individuals showing fight or flight behavior were more likely to survive than individuals lacking this trait. Therefore surviving individuals passed on their trait to offspring while nonsurviving individuals do not. Thus, this response became incorporated into human lineage. d. Individuals showing fight or flight behavior were not more fit than individuals lacking this trait. However, the trait was selected by natural selection due to a random chance event in the gene frequency of individuals showing fight or flight behavior

Explain the correlation between age structure and the level of economic development observed in many countries. a. There is no correlation between the characteristics of age structures and the level of economic development. b. Countries that are more economically developed tend to have fewer middle- aged individuals and more young individuals than undeveloped countries. c. A larger ratio of very young individuals to very old individuals characterizes the age structures of countries with the highest economic development. d. Age structures of economically undeveloped countries show greater proportions of children and fewer proportions of elderly people.

A researcher is interested in investigating whether the croaking pattern produced by males in a frog species is a learned behavior or an innate behavior. Which of the following would best help the researcher answer this question? a. genetic analyses of adult male frogs raised in isolation and in multigenerational frog communities b. field observations of adult frogs in their native habitat during mating season c. video recordings of individual frogs raised in large multigenerational frog communities d. audio recordings of individual frogs at sexual maturity after being raised in total isolation
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