Based on the trends in the data, which statement best explains the trends in the bison population during this 20-year period?OA. A decrease in resources for the bison caused fewer bison calves to be born.OOOB.An increase in predation of adult bison caused an exponential decrease in the bison population.A decrease in competition from elk over resources caused the carrying capacity of bison to increase.An increase in competition from wolves over resources caused the carrying capacity of bison to decrease. In 1995, a population of 31 gray wolves was introduced into Yellowstone National Park. The population of the gray wolves fluctuated in the 20-year period after introduction. In 2019 an estimated 80-110 wolves are present in the park.Wolves, elk, and bison are native to Yellowstone, but the wolves disappeared in the 1920s due to excessive hunting. Wolves are primarily carnivores, and elk and bison are primarily herbivores.A team of scientists monitored the population of wolves in Yellowstone for the first 20 years after their release.Number of Individuals200180160140120100806040200Number of IndividualsFigure 1. Number of Wolvesin Yellowstone After ReleaseThe scientists also monitored the populations of elk and bison in Yellowstone for the first 20 years after the wolves' release.Figure 2. Number of Elkand Bison in YellowstoneAfter Wolf Release16,00014,00012,00010,0008,0006,0004,0002,0000Number of Elk Calvesper 100 Adult Females40302 4 6 8 10 12 14 16 18 20YearsSource: NPS/Yellowstone Wolf ProjectThe scientists also tracked the number of elk calves born per 100 elk females compared to the total number of wolves in the park.Figure 3. Comparison of theNumber of Elk Calves per100 Elk Females to the Numberof Wolves in Yellowstone20O2 4 6 8 10 12 14 16 18 20Years→ Elk→ BisonSource: NPS/Yellowstone Wolf Project20 40 60 80 100Number of WolvesSource: NPS/Yellowstone Wolf Project

In 1995, wolves were introduced into Yellowstone National Park for several reasons, chief among…

Based on the trends in the data, which statement best explains the trends in the bison population during this 20-year period? O A decrease in resources for the bison caused fewer bison calves to be born. An increase in predation of adult bison caused an exponential decrease in the bison population. A decrease in competition from elk over resources caused the carrying capacity of bison to increase. An increase in competition from wolves over resources caused the carrying capacity of bison to decrease.

Based on the trends in the data, which statement best explains the trends in the bison population during this 20-year period? O A decrease in resources for the bison caused fewer bison calves to be born. An increase in predation of adult bison caused an exponential decrease in the bison population. A decrease in competition from elk over resources caused the carrying capacity of bison to increase. An increase in competition from wolves over resources caused the carrying capacity of bison to decrease.

Biology (MindTap Course List)

11th Edition

ISBN:9781337392938

Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Publisher:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Chapter53: Introduction To Ecology: Population Ecology

Section: Chapter Questions

Problem 6TYU: The largest population that can be maintained by a particular environment for an indefinite period...

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Question

Based on the trends in the data, which statement best explains the trends in the bison population during this 20-year period?
O
A. A decrease in resources for the bison caused fewer bison calves to be born.
O
O
O
B.
An increase in predation of adult bison caused an exponential decrease in the bison population.
A decrease in competition from elk over resources caused the carrying capacity of bison to increase.
An increase in competition from wolves over resources caused the carrying capacity of bison to decrease.

In 1995, a population of 31 gray wolves was introduced into Yellowstone National Park. The population of the gray wolves fluctuated in the 20-year period after introduction. In 2019 an estimated 80-110 wolves are present in the park.
Wolves, elk, and bison are native to Yellowstone, but the wolves disappeared in the 1920s due to excessive hunting. Wolves are primarily carnivores, and elk and bison are primarily herbivores.
A team of scientists monitored the population of wolves in Yellowstone for the first 20 years after their release.
Number of Individuals
200
180
160
140
120
100
80
60
40
20
0
Number of Individuals
Figure 1. Number of Wolves
in Yellowstone After Release
The scientists also monitored the populations of elk and bison in Yellowstone for the first 20 years after the wolves' release.
Figure 2. Number of Elk
and Bison in Yellowstone
After Wolf Release
16,000
14,000
12,000
10,000
8,000
6,000
4,000
2,000
0
Number of Elk Calves
per 100 Adult Females
40
30
2 4 6 8 10 12 14 16 18 20
Years
Source: NPS/Yellowstone Wolf Project
The scientists also tracked the number of elk calves born per 100 elk females compared to the total number of wolves in the park.
Figure 3. Comparison of the
Number of Elk Calves per
100 Elk Females to the Number
of Wolves in Yellowstone
20
O
2 4 6 8 10 12 14 16 18 20
Years
→ Elk
→ Bison
Source: NPS/Yellowstone Wolf Project
20 40 60 80 100
Number of Wolves
Source: NPS/Yellowstone Wolf Project

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