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Chapter 54: Q54-5TYU (page 1235)

Predators that are keystone species can maintain species diversity in a community if they

(A) competitively exclude other predators.

(B) prey on the community鈥檚 dominant species.

(C) reduce the number of disruptions in the community.

(D) prey only on the least abundant species in the community.

Short Answer

Expert verified

  1. The statement 鈥渃ompetitively exclude other predators鈥� isfalse.

  2. The statement 鈥減rey on the community鈥檚 dominant species鈥� istrue.

  3. The statement 鈥渞educe the number of disruptions in the community鈥� is false.

  4. The statement 鈥減rey only on the least abundant species in the community鈥� is false.

Step by step solution

01

Predator

The species recognized as the keystone species and keeping the prey population in balance are called predators like gray wolves and beavers.

02

Explanation of option ‘(A)’

The varieties of roles performed by the predator in an ecosystem are maintaining ecosystem structure, decreasing competitive exclusion, and energy transfer at the trophic levels.

Thus, the species amount will be reduced by excluding predators by competition.

Therefore, the given statement is false.

03

Explanation of option ‘(B)’

The field of ecology defines prey as an animal that predators hunt or kill to eat all parts of its body as food.

Thus, the dominating species will be more and compete with other species.

Therefore, the given statement is true.

04

Explanation of option ‘(C)’

Some examples of biological disturbances are insect outbreaks, storms, trampling, and flooding.

Thus, there will be no effect of keystone species on the disruption in the community.

Therefore, the given statement is false.

05

Explanation of option ‘(D)’

Examples of predator-prey include fox-rabbit, bear-salmon, and lion-zebra.

Thus, biodiversity will not be increasing while preying on the least abundant species.

Therefore, the given statement is false.

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Most popular questions from this chapter

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.

After examining Figure 52.19, you decide to study feeding relationships among sea otters, sea urchins, and kelp. You know that sea otters prey on sea urchins and that urchins eat kelp. At four coastal sites, you measure kelp abundance. Then you spend one day at each site and mark whether otters are present or absent every 5 minutes during the day. Graph kelp abundance (on the y-axis) versus otter density (on the x-axis), using the data below. Then formulate a hypothesis to explain any pattern you observe.

An ecologist studying desert plants performed the following experiment. She staked out two identical plots, containing sagebrush plants and small annual wildflowers. She found the same five wildflower species in roughly equal numbers on both plots. She then enclosed one plot with a fence to keep out kangaroo rats, the most common grain-eaters of the area. After two years, four of the wildflower species were no longer present in the fenced plot, but one species had become much more abundant. The control plot had not changed in species diversity. Using the principles of community ecology, propose a hypothesis to explain her results. What additional evidence would support your hypothesis?

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.

Why do high and low levels of disturbance usually reduce species diversity? Why does an intermediate level of disturbance promote species diversity?
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