The Habitat and Food Requirements of Grizzly Bears and Black

question 31

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.

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Definitions:

Defensiveness

A psychological reaction characterized by a refusal to accept or consider criticism or uncomfortable truths about oneself, often as a mechanism to protect self-esteem.

Endogamy

The practice of marrying within a specific social group, caste, or ethnic group, rejecting those from others as inappropriate for marriage or other close relationships.

Legal Barriers

Laws or regulations that constitute obstacles to certain actions or changes.

Family Size

The total number of members in a family unit, including parents and children.