Knowledge of Where Animals Forage for Food Is Essential for Effective

question 23

Essay

Knowledge of where animals forage for food is essential for effective wildlifemanagement and conservation. The data below are foraging heights (in m) for asample of Mountain Chickadees. The data are taken from two different species of firtrees: the Douglas fir and the White fir. (a) Display these data using a comparative (back-to-back) stem-and-leaf plot. Usethe stems shown below, and be sure to include all information needed to comparethe two distributions. (b) Compare the distributions in part (a). What differences and similarities do youobserve in the two distributions?
(c) When Mountain Chicadees are sampled to assess their health, they are captured inmist-nets, which are set to capture the birds at different heights. The mist nets areabout 2 meters high, and directions must be given to the persons who set up thenests so that the mist-nets are positioned to capture the most birds. Based on thedata from part (a) and your display in part (b), write a short paragraph describingthe appropriate mist-net height in a forest region of Douglas firs and for a forestregion of White firs.

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Definitions:

Negative Selection

A process in the immune system where T cells that strongly react against self-antigens are eliminated to prevent autoimmunity.

Lymphocytes

A subtype of white blood cell found in lymph that plays a crucial role in the immune response by identifying and neutralizing pathogens.

Self-antigens

Molecules present within an individual's own cells that are recognized by the immune system as belonging to the self, preventing an immune response against them.

Phagocytosis

A cellular process where cells engulf and digest particles or other cells.