The elk and deer population soared in Yellowstone National Park in the early 1900s when wolves were completely removed from the park. What happened to grasslands in Yellowstone after wolves were reintroduced in 1995?
Grasslands flourished because of lower populations of deer and elk eating the grass.
When wolves were reintroduced in Yellowstone in 1995, their predation helped to control the population of elk and deer. This reduced grazing pressure on the grasslands, allowing them to thrive and flourish.
This choice is incorrect because the reintroduction of wolves would have likely reduced the population of small burrowing animals, not increased it. Wolves are apex predators and would prey on such animals, keeping their populations in check.
This is incorrect, as while a decrease in deer and elk populations can lead to an increase in tree growth due to lessened browsing pressure, it does not directly cause grasslands to become stands of trees. Tree growth would be dependent on several other factors including suitable conditions and seed availability.
This is correct. The reintroduction of wolves reduced the populations of elk and deer, which in turn reduced the grazing pressure on the grasslands. This allowed the grasslands to flourish.
This is incorrect. While wolves do traverse the grasslands, their impact on the vegetation through this activity is minimal and would not lead to the grasslands becoming sparser.
The reintroduction of wolves in Yellowstone National Park in 1995 led to a decrease in the populations of elk and deer. This decrease in herbivory pressure allowed the grasslands to flourish. The other options are incorrect as they either misinterpret the effects of the wolves' reintroduction or they inaccurately describe the resulting changes to the grassland ecosystem.
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