Select one answer.
Species richness is
The number of species in a population
The number of different species in an area
The total weight, or biomass, of living organisms in a given area
The number of organisms in a community
Select one answer.
Occasionally American alligators are sighted in rivers or lakes in New York City, far north of their usual range. These alligators are usually escaped pets. There is no self-sustaining population of alligators in New York, and they have no important influence on other populations there. Is the American alligator a member of the ecological community in New York?
Select one answer.
By damming streams, American beavers produce swamp, open marsh, and pond habitats that would not otherwise exist. Ecologists have compared the species diversity in regions with and without beaver populations. If the beaver is a keystone species, what do you think they found?
Species diversity was higher in areas with beaver.
Beaver did not influence the diversity of other species.
Species diversity was higher in areas without beaver.
Select one answer.
Which of the following is an indirect interspecific interaction?
Big fish eat small fish.
Small fish eat swimming crustaceans called zooplankton.
Zooplankton eat (graze) floating algae called phytoplankton.
Large fish reduce the abundance of phytoplankton. This occurs because large fish eat small fish, which leads to greater zooplankton numbers. The zooplankton grazing then reduces phytoplankton abundance.
Individual pike (large fish) compete with each other for feeding territories.
Select one answer.
In Africa, grasses are the main vegetation in savanna communities. Acacias and other trees are few and widely scattered. Elephants range over very large territories and are not very abundant in any one location. However, they strongly affect the community by uprooting and consuming trees and shrubs, maintaining suitable habitat for grasses and grassland animals. Many species of birds and insects live in the savanna grasses. Which of the species or groups above would best be described as foundation species?
birds and insects
Select all that apply.
Which of the following are examples of symbiosis? Select all that apply.
Head lice complete an entire life cycle within a person
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