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.

Question

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.

Quizplus · Accepted Answer

The Answer is a) Foraging heights of Mountain Chickadees (m)

a) Foraging heights of Mountain Chickadees (m) b) The two distributions are similar in being reasonably symmetric.The distribution for Douglas firs is less widely spread out, and the values are generally a little lower than for the White firs. c) To capture the most birds with a 2m high net, the 2m range where the data is most concentrated must be estimated.In a stand of Douglas pine the most dense part of the distribution is from about 0.5 to 1.5 meters off the ground. In a stand of White pine the most dense part of the distribution appears to be about 1.0 to 2.0 meters off the ground.

b) The two distributions are similar in being reasonably symmetric.The distribution for Douglas firs is less widely spread out, and the values are generally a little lower than for the White firs.
c) To capture the most birds with a 2m high net, the 2m range where the data is most concentrated must be estimated.In a stand of Douglas pine the most dense part of the distribution is from about 0.5 to 1.5 meters off the ground. In a stand of White pine the most dense part of the distribution appears to be about 1.0 to 2.0 meters off the ground.

Knowledge of Where Animals Forage for Food Is Essential for Effective