Biology
Biology
12th Edition
ISBN: 9780134813448
Author: Audesirk, Teresa, Gerald, Byers, Bruce E.
Publisher: Pearson,
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Chapter 31.3, Problem 1CSC
Summary Introduction

To determine: The way by which minimum viable population of wolves influences the sustainability of other animals in the food web.

Introduction: The linear network of links present in a food web beginning from the autotrophic producers and ending with the apex that includes predator species is called a food chain. The various positions occupied by organisms in a food chain are called the trophic level.

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You study a population of snails recently introduced to a small lake 10 years ago. You know that 7 snails were originally let go in the lake by a cottager. The lake has no snail predators nor any other species occupying the same or a similar ecological niche. You know from your research that, under ideal conditions, the instantaneous rate of increase of this snail species is 0.5. You also think the conditions on the lake were ideal when the snails were introduced. After surveying the food available in the lake, you estimated that there is enough food to support a population of 1696 snails. How many snails do expect to be in the lake now?
In 1970 the deer population of an island forest reserve about 518 square kilometers in size was about 2000 animals. Although the island had excellent vegetation for feeding, the food supply obviously had limits. Thus the forest management personnel feared that overgrazing might lead to mass starvation. Since the area was too remote for hunters, the wildlife service decided to bring in natural predators to control the deer population. It was hoped that natural predation would keep the deer population from becoming too large and also increase the deer quality (or health), as predators often eliminate the weaker members of the herd. In 1971, ten wolves were flown into the island. The data collected during this program are shown in the following table. The Population Change is the number of deer born minus the number of deer that died during that year. Fill in the last column for each year. The first has been calculated for you. Then graph the deer and wolf populations on the graph below.…
In 1970 the deer population of an island forest reserve about 518 square kilometers in size was about 2000 animals. Although the island had excellent vegetation for feeding, the food supply obviously had limits. Thus the forest management personnel feared that overgrazing might lead to mass starvation. Since the area was too remote for hunters, the wildlife service decided to bring in natural predators to control the deer population. It was hoped that natural predation would keep the deer population from becoming too large and also increase the deer quality (or health), as predators often eliminate the weaker members of the herd. In 1971, ten wolves were flown into the island. The data collected during this program are shown in the following table. The Population Change is the number of deer born minus the number of deer that died during that year. Fill in the last column for each year. The first has been calculated for you. Then graph the deer and wolf populations on the graph below.…
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