G. Tyler Miller, Scott E. Spoolman
14th EditionEldon D. Enger
Jay H. Withgott
ENVIRONMENTAL SCIENCE In 1906, President Theodore Roosevelt established the Grand Canyon National Game Preserve on the Kaibab Plateau in northern Arizona.The preserve was created to protect deer from hunting and predation, which had reduced the population of Kaibab deer to only about 4000. Hunters were prohibited from shooting deer, but they were allowed to shoot the deers predators, including cougars and coyotes. Between 1907 and 1923, over 600 cougars and 3000 coyotes were trapped or killed. As a result, the deer herd began to increase. By 1915, the deer were estimated at 25,000; by 1920, at 50,000; and by 1923, at approximately 100,000.
Deer can live 10 to 25 years. Which of the following most likely describes an age structure diagram of the Kaibab deer population in 1923?
a. an upside-down triangle, very wide at the top and narrow at the bottom
b. a rectangle, almost the same size from bottom to top
c. a narrow upside-down triangle, a little wider at the top than the bottom
d. a triangle with a very wide base and narrow top