Problem 3 - Biology Concepts and Applications

Question

Lizards that eat flies they catch on the ground and birds that eat flies they catch in the air are engaged in _____ competition. a. exploitative d. interspecific b. interference e. both a and d c. intraspecific f. both \(b\) and \(c\)

Step-by-Step Solution

Answer

e. both a and d

Step 1: Define the types of competition

There are generally two main types of competition relevant here: **exploitative** competition, where organisms compete indirectly through the consumption of shared resources, and **interference** competition, where organisms directly interfere with each other's ability to obtain resources. Moreover, **interspecific** competition occurs between members of different species, while **intraspecific** competition occurs within the same species.

Step 2: Analyze the scenario

The scenario involves lizards and birds competing for flies as a resource. Since lizards catch flies on the ground and birds catch them in the air, they are competing for the same type of resource (flies) but in different manners.

Step 3: Identify the type of competition

Because both species affect each other's access to the common resource (flies), this can be seen as **exploitative** competition. Moreover, since the competition is between lizards and birds (different species), it is **interspecific** competition.

Step 4: Check answer options

Given the definitions and analysis, the competition is **exploitative** and **interspecific**. Therefore, the correct answer is the combination of both types, which corresponds to option **e. both a and d**.

Key Concepts

Exploitative Competition

Exploitative competition occurs when different organisms compete indirectly by consuming shared environmental resources. This type of competition does not involve direct interference or confrontation between the species involved. Instead, the competition manifests itself through the depletion of these shared resources.

In the case of flies serving as a food resource for both lizards and birds, exploitative competition arises when these organisms consume enough flies to impact each other's access to this resource.

• Neither species actively blocks or interferes directly with the other.
• Competition occurs as a result of the total number of flies being reduced.

This reduction subsequently limits food availability for both lizards and birds, illustrating how exploitative competition functions as an indirect battle for survival based solely on consumption rates.

Interspecific Competition

Interspecific competition refers to the competitive interactions between members of different species for shared resources. This form of competition is prevalent in many ecological scenarios where two or more species share a niche and resources.

For example, in our lizard and bird scenario, both species engage in interspecific competition by targeting the same prey: flies.

• Although they catch flies differently (lizards on the ground, birds in the air), they are affecting each other's resource pool.
• Their activities can influence each other's survival and reproduction, depending on the abundance of flies available.

Interspecific competition is an essential dynamic in ecological systems, playing a significant role in shaping the behavior, distribution, and population density of competing species.

Interference Competition

Interference competition involves direct interactions between organisms that hinder each other's access to resources. This could include physical confrontations, aggression, or any form of active deterrence to resource access.

Unlike exploitative competition, interference competition is marked by direct actions:

• Organisms may fight over food, space, or mates, directly preventing competitors from obtaining these resources.
• A common example is when animals establish territories and actively chase away rivals.

While interference competition wasn’t the focus in our lizard and bird example, it's important to understand it as one of the key ways organisms struggle for survival. This type of competition can significantly influence evolutionary pressures and lead to specialized adaptations.