Most species within a group have (blank) geographic ranges and few have (blank) ranges

Small, very large

Where are mammals' geographic ranges typically the largest?

Near the poles

What is one theory to explain why polar species occupy such large ranges?

The theory says that because of the large fluctuations in environment, the species must be well-adapted and able to take on many conditions

What prediction is made about terrestrial plants and animals from the broad polar territory hypothesis?

Their climatic tolerance should increase from tropical to polar regions; this holds true for salamanders according to Snyder & Weathers 1975

What prediction about shallow water marine fish does the broad polar range hypothesis give?

It predicts that temperature variability is much greater in temperate regions compared to the poles and equator

How could glaciation heavily impact the results from Rapoport's Rule?

Only species that had very large distribution ranges were able to repopulate the glacial northern areas

What impact could competition have on Rapoport's Rule?

Competition in the northern regions is minimal at most which allows for them to have a much greater population range