Question

Species richness increases Select one: a. as we increase in altitude in equatorial mountains. b. as community size decreases. c. on islands as distance from the mainland increases. d. as we travel southward from the North Pole. e. as depth increases in aquatic communities.

Answer 1

Answer:

D) as we travel southward from the North Pole.

Explanation:

Species richness is the number of different species in a particular community. If we found 30 species in one community, and 300 species in another, the second community would have much higher species richness than the first.

Communities with the highest species richness tend to be found in areas near the equator, which have lots of solar energy (supporting high primary productivity), warm temperatures, large amounts of rainfall, and little seasonal change. Communities with the lowest species richness lie near the poles, which get less solar energy and are colder, drier, and less amenable to life. This pattern is illustrated below for mammalian species richness (species richness calculated only for mammal species, not for all species). Many other factors in addition to latitude can also affect a community's species-richness.

Answer 2

Species richness increases:

Select one:

a. as we increase in altitude in equatorial mountains.

b. as community size decreases.

c. on islands as distance from the mainland increases.

d. as we travel southward from the North Pole.

e. as depth increases in aquatic communities.

Answer:

The correct answer is D)

Species richness increases as we travel southward from the North Pole.

Explanation:

Studies have shown that plant diversity for instance decrease in richness (and total plant cover) with elevation is due to the environmental severity which

increases with elevation because of coldness, short growing seasons, excessive radiation, and other factors.

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