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The data suggest top-down control because snowshoe hare survival increased whenever predators were excluded. The data suggest bottom-up control because snowshoe hare survival increased when either fertilizer or food supplements were addeded. The data suggest both bottom-up and top-down control because snowshoe hare survival increased the most when predators were excluded and food supplements were added. xO Boreal forests (where snowshoe hares are found) are cold but fairly productive. The relatively high productivity suggests that

The data suggest top-down control because snowshoe hare survival increased whenever predators were excluded. The data suggest bottom-up control because snowshoe hare survival increased when either fertilizer or food supplements were addeded. The data suggest both bottom-up and top-down control because snowshoe hare survival increased the most when predators were excluded and food supplements were added. xO Boreal forests (where snowshoe hares are found) are cold but fairly productive. The relatively high productivity suggests that

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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The data suggest top-down control because snowshoe hare survival increased whenever predators were excluded. The data suggest bottom-up control because snowshoe hare survival increased when either fertilizer or food supplements were addeded. The data suggest both bottom-up and top-down control because snowshoe hare survival increased the most when predators were excluded and food supplements were added. x O Boreal forests (where snowshoe hares are found) are cold but fairly productive. The relatively high productivity suggests that bottom-up control should be most important.
Transcribed Image Text:The data suggest top-down control because snowshoe hare survival increased whenever predators were excluded. The data suggest bottom-up control because snowshoe hare survival increased when either fertilizer or food supplements were addeded. The data suggest both bottom-up and top-down control because snowshoe hare survival increased the most when predators were excluded and food supplements were added. x O Boreal forests (where snowshoe hares are found) are cold but fairly productive. The relatively high productivity suggests that bottom-up control should be most important.
0.28 0.24 0.20 0.16 0.12 0.08 0.04 Controls Fertilizer Food Predator Predator Exclosure Exclosure +Food The above figure based on data from Krebs et al. (1995) depicts the results from a manipulative experiment to determine factors affecting snowshoe hare survival rates (y-axis). Mean survival rates are reported for snowshoe hares under normal conditions (control); in areas with fertilizer added; in areas with additional food supplements; in areas free from predators; and in areas with food supplements and free from predators. Based on this figure, which of the following statements is most likely true? SURVIVAL RATE (PER YEAR)
Transcribed Image Text:0.28 0.24 0.20 0.16 0.12 0.08 0.04 Controls Fertilizer Food Predator Predator Exclosure Exclosure +Food The above figure based on data from Krebs et al. (1995) depicts the results from a manipulative experiment to determine factors affecting snowshoe hare survival rates (y-axis). Mean survival rates are reported for snowshoe hares under normal conditions (control); in areas with fertilizer added; in areas with additional food supplements; in areas free from predators; and in areas with food supplements and free from predators. Based on this figure, which of the following statements is most likely true? SURVIVAL RATE (PER YEAR)
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