The Habitat and Food Requirements of Grizzly Bears and Black

Multiple Choice

The habitat and food requirements of grizzly bears and black bears are similar but not identical.A study in British Columbia examined predicted versus actual distributions of these two species using hair traps and DNA analysis of the hair to determine whether black bears or grizzly bears were using particular areas.Most of the area was suitable for both species, but black bears mainly occurred in valley bottoms and open habitats, whereas grizzly bears occurred in more closed habitats (forest) at higher elevations.The lack of overlap in habitat suggests that the two bear species are practicing

A) competitive exclusion.
B) interference competition.
C) exploitation competition.
D) resource partitioning.
E) character displacement.