Read e-book online National Parks and Protected Areas: Keystones to PDF

By J. G. Nelson, Rafal Serafin (auth.), James Gordon Nelson, Rafal Serafin (eds.)

ISBN-10: 3642609074

ISBN-13: 9783642609077

ISBN-10: 3642646034

ISBN-13: 9783642646034

National parks and guarded components provide a wealth of ecological and social contributions or prone to people and lifestyles in the world. This booklet describes the strengths of nationwide parks and guarded parts in numerous components of Europe and North the United States and the demanding situations to the whole awareness in their targets. It exhibits that they're worthwhile not just in preserving infrequent species and biodiversity, but in addition in holding water offer and different assets essential to tourism and to monetary and social improvement typically. principles and data on invaluable making plans, administration and decision-making preparations are awarded, and learn wishes are identified.

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Each group maintains contacts with the other groups of SUb-populations; this system has been called by Levins (1970) metapopulation. Extinction and recoloniz;ltion are two essential components of the metapopulation model. The distance of a subpopulation to another is the key factor determining survival or the extinction (Figure 3). 26 Figure 3. Examples of metapopulation models. Habitat patches are indicated by closed circles; filled=occupied, unfilled=vacant. Dashed lines represent the boundaries of population.

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National Parks and Protected Areas: Keystones to Conservation and Sustainable Development by J. G. Nelson, Rafal Serafin (auth.), James Gordon Nelson, Rafal Serafin (eds.)


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