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Chapter 54: Q54-11TYU (page 1235)

Explain why adaptations of particular organisms to interspecific competition may not necessarily represent instances of character displacement. What would a researcher have to demonstrate about two competing species to make a convincing case for character displacement?

Short Answer

Expert verified

When a character can only be recognized in a particular habitat, character transfer occurs. Therefore, changes in an individual species' response to a conflict with another species don't necessarily indicate character displacement.

The more prominent species must prevail over the weaker individuals in each form of conflict to support a compelling case for distinct relocation or displacement. Consequently, they would be able to get rid of anxious animals.

Step by step solution

01

Interspecific competition

In biology, interspecific competition refers to interactions in which different species compete for objects in the same environment. Interspecific rivalry can result when two species share a resource at the exact location.

02

Character displacement

Character displacement is used to describe an evolutionary transition when two similar species coexist in a single habitat. Due to natural selection, there can be divergence in the species' morphology, ecology, behavior, or physiology.

03

Characters displacement related to completion

Character displacement refers to howpopulations of closely related species undergo fast evolution after first coming into contact to reduce the likelihood of competition and hybridization.

In a genetically divergent population, trait divergence is more significant than in a physically similar population because of the displacement of features. Their inability to adapt to or live primarily in their surroundings changed aspects of their personalities.

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Most popular questions from this chapter

Based on the intermediate disturbance hypothesis, a community鈥檚 species diversity is increased by

(A) frequent massive disturbance.

(B) stable conditions with no disturbance.

(C) moderate levels of disturbance.

(D) human intervention to eliminate disturbance.

The feeding relationships among the species in a community determine the community's

(A) secondary succession.

(B) ecological niche.

(C) species richness.

(D) trophic structure.

In the Chesapeake Bay estuary, the blue crab is an omnivore that eats eelgrass and other primary producers as well as clams. It is also a cannibal. In turn, the crabs are eaten by humans and by the endangered Kemp鈥檚 Ridley sea turtle. Based on this information, draw a food web that includes the blue crab. Assuming that the top-down model holds for this system, describe what would happen to the abundance of eelgrass if humans stopped eating blue crabs.

The principle of competitive exclusion states that

(A) two species cannot coexist in the same habitat.

(B) competition between two species always causes extinction or emigration of one species.

(C) two species that have exactly the same niche cannot coexist in a community.

(D) two species will stop reproducing until one species leaves the habitat.

Which of the following could qualify as a top-down control on a grassland community?

(A) limitation of plant biomass by rainfall amount.

(B) influence of temperature on competition among plants.

(C) influence of soil nutrients on the abundance of grasses versus wildflowers.

(D) effect of grazing intensity by bison on plant species diversity.
See all solutions

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