Problem 3 - Campbell Biology Concepts & Connections

Question

Pheasants do not feed their chicks. Immediately after hatching, a pheasant chick starts pecking at seeds and insects on the ground. How might a behavioral ecologist explain the ultimate cause of this behavior? a. Pecking is an innate behavior. b. Pheasants learned to peck, and their offspring inherited this behavior. c. Pecking by newly hatched chicks is the result of trial-and-error learning. d. Pecking is a result of imprinting during a sensitive period.

Step-by-Step Solution

Answer

a. Pecking is an innate behavior.

Step 1: Understand the Question

The task is to determine the ultimate cause of pecking behavior in pheasant chicks. The ultimate cause refers to the evolutionary reason why a behavior exists and benefits the species' survival or reproduction.

Step 2: Define Each Option

Each option provided explains the cause differently: a. Innate behavior: genetically hard-wired and doesn't require learning.b. Learned behavior: learned by parents and passed down.c. Trial-and-error learning: behavior refined through repeated attempts.d. Imprinting: behavior learned during a critical period.

Step 3: Analyze the Behavior

Considering pheasant chicks start pecking immediately after hatching without parental instruction, the behavior is likely not learned from parents or refined by trial and error.

Step 4: Compare Remaining Options

Since chicks peck immediately, and there's no mention of a sensitive period critical for learning, the behavior is most likely innate (option a).

Step 5: Conclusion

The ultimate cause of pecking behavior is likely innate, an instinctual action benefiting survival right after hatching.

Key Concepts

innate behavior

Innate behavior refers to actions and responses that are genetically programmed and inherent in an organism. These behaviors are not learned or practiced; instead, they occur naturally, often from birth or when an organism reaches a certain developmental stage.
For example, pheasant chicks pecking immediately after hatching is an innate behavior. They do not need to learn or practice this action; it is instinctual and helps them find food right away.
Innate behaviors are essential for survival, especially in situations where immediate actions are required without the opportunity for learning or hesitation.
Examples of innate behaviors include:

• Reflexes, like baby turtles heading toward the ocean after hatching
• Fixed action patterns, such as birds building nests
• Instincts, like spiderlings spinning webs

These behaviors often have an ultimate cause rooted in evolutionary advantages, ensuring that the species can survive and reproduce successfully.

ultimate cause

The ultimate cause of a behavior refers to the evolutionary reasoning behind why an action benefits a species in terms of survival and reproduction.
Understanding the ultimate cause involves looking at how a behavior enhances an organism's chances of surviving and passing on its genes.
For the pheasant chicks, pecking at seeds and insects immediately after hatching is an example of such behavior. The ultimate cause is to ensure they can feed themselves and grow rapidly during a critical developmental phase.

• Immediate access to food increases their chances of survival
• Helps them grow stronger, avoiding predation
• Prepares them for independent living from an early age

Analyzing behaviors with an ultimate cause perspective provides insight into the evolutionary pressures that shape these actions. This angle reveals the long-term benefits contributing to the species' evolutionary success.

evolutionary biology

Evolutionary biology studies the origins and changes in the diversity of life over generations. It looks at how species adapt to their environments and evolve through natural selection and genetic mutations.
In the context of behavioral ecology, evolutionary biology helps explain why certain behaviors emerge and persist. For pheasant chicks, their innate pecking behavior is a result of evolutionary pressures.
Over countless generations, chicks that pecked immediately after hatching were more likely to survive and reproduce, passing down this trait to their offspring.
Key concepts in evolutionary biology include:

• Natural selection: Survival and reproduction of the fittest organisms
• Mutation: Genetic changes that can introduce new traits
• Adaptation: Traits that help organisms better survive in their environments

By studying these principles, we can understand how behaviors that seem simple, like pecking at food, have profound evolutionary significance.

survival instincts

Survival instincts are innate behaviors that have evolved specifically to enhance an organism's chances of surviving in its environment. These instincts are hardwired into an organism's DNA, ensuring that they can respond quickly to threats and opportunities.
For pheasant chicks, pecking right after hatching is a crucial survival instinct. This behavior ensures they can find food immediately, which is vital for their growth and development.
Other examples of survival instincts include:

• Fight or flight responses in dangerous situations
• Homing abilities in animals migrating back to breeding grounds
• Pain reflexes that help avoid injury

Survival instincts can be seen across the animal kingdom and are often the result of hundreds or thousands of years of evolutionary adaptation to specific environments and challenges.
Understanding these instincts provides valuable insights into the fundamental needs and pressures that shape the behavior of all living organisms.