Download A Natural History of California (California Natural History by Allan A. Schoenherr PDF

By Allan A. Schoenherr

During this entire and abundantly illustrated publication, Allan Schoenherr describes a country with a better variety of landforms, a greater diversity of habitats, and extra types of crops and animals than any zone of identical dimension in all of North the US. A usual heritage of California will familiarize the reader with the weather, rocks, soil, crops and animals in each one exact sector of the kingdom.

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Florida experiences considerable summer rain in a pattern known as a monsoon climate. The amount of summer rain diminishes to the north, but warm water offshore contributes to summer precipitation over the entire Atlantic coast. Winter snowstorms are also common along the Atlantic coast, particularly at higher elevations and toward the north. Florida is sunny and dry in the winter. In the center of North America, the plains states get reduced amounts of precipitation, although they receive some winter precipitation from the north, which may be snow, and they also get summer thunderstorms from the south.

This is an example of agriculture because frequently only the economically important species is replanted. The crop is then weeded and sprayed with pesticides to keep out other species. In the end, it would take an outbreak of only one resistant pest species to wipe out the whole crop. A managed forest is therefore not very stable and takes considerable effort to maintain. Sometimes, in an attempt to make a natural ecosystem "better" for a certain species, humans wind up doing more damage than if they had left it alone.

Unfortunately, most organisms in the ecosystem are unable to carry out this process. To them, nitrogen gas is inert. Some micro-organisms, such as certain soil bacteria and blue-green algae (Cyanobacteria), have the ability to fix atmospheric nitrogen. Entire ecosystems therefore depend on these unsung heroes for their protein (fig. 5). Nitrogen-fixing bacteria often inhabit the roots of certain plants in terrestrial ecosystems. Air spaces in the soil provide the atmospheric nitrogen, and the continued growth of roots provides the bacteria with a constant supply of fresh air.

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