The Gale encyclopedia of science vol 4 by K Lee Lerner; Brenda Wilmoth Lerner PDF

By K Lee Lerner; Brenda Wilmoth Lerner

ISBN-10: 0787675547

ISBN-13: 9780787675547

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Reproduced by permission. Economic importance Wild rabbits and hares of all species are a favorite class of small game hunted by many people for the pot and as sport. These animals are rather fecund and their populations can be quite productive, and they can therefore be harvested in large numbers. Millions of these animals are shot and snared each year in North America. They are mostly hunted for their meat, because the skins of these animals are fragile and tear easily, and therefore the fur has little commercial value.

The latter two species take readily to the water and swim well. All of these rabbits are abundant, and are hunted over much of their range. 2258 The most widespread hare in North America is the snowshoe or varying hare (Lepus americana), which occurs from the low-arctic tundra, through much of the northern United States. This species is dark brown during the summer, but is a camouflaged white in winter. This species goes through more-or-less cyclic variations of abundance in northern parts of its range, which are tracked by the populations of some of its predators, such as lynx (Lynx rufus).

These chemicals combine with moisture and sunlight and are converted into sulfuric and nitric acid that enter lakes via precipitation. 6. Since a single digit pH difference (say, from eight to nine) represents a 10-fold change in acidity, acid rain is more than 10 times more acidic than normal rain. Freshwater life generally prefers alkaline (basic, non-acidic) conditions, but lake fertility is usually fairly functional down to a pH of six. However, when pH drops to five and below, as the effects of acidrain accumulate, life forms are severely effected.

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The Gale encyclopedia of science vol 4 by K Lee Lerner; Brenda Wilmoth Lerner

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