North American Project--a Study of U.S. Water Bodies PDF Download

Author: Corvallis Environmental Research Laboratory
Publisher:
ISBN:
Category : Eutrophication
Languages : en
Pages : 552

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Author:
Publisher:
ISBN:
Category : Biogeography
Languages : en
Pages : 92

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Book Description
This volume represents a first attempt at holistically classifying and mapping ecological regions across all three countries of the North American continent. A common analytical methodology is used to examine North American ecology at multiple scales, from large continental ecosystems to subdivisions of these that correlate more detailed physical and biological settings with human activities on two levels of successively smaller units. The volume begins with an overview of North America from an ecological perspective, concepts of ecological regionalization. This is followed by descriptions of the 15 broad ecological regions, including information on physical and biological setting and human activities. The final section presents case studies in applications of the ecological characterization methodology to environmental issues. The appendix includes a list of common and scientific names of selected species characteristic of the ecological regions.

Author:
Publisher:
ISBN:
Category : Hydrology
Languages : en
Pages : 598

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Author: United States. Superintendent of Documents
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1228

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February issue includes Appendix entitled Directory of United States Government periodicals and subscription publications; September issue includes List of depository libraries; June and December issues include semiannual index

Author: Bruce J. Neilson
Publisher: Springer Science & Business Media
ISBN: 146125826X
Category : Science
Languages : en
Pages : 640

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Estuaries are eternally enriched. Their positions at the foot of watersheds and their convenience as receiving bodies for the wastes of cites, towns and farms results in continuous addition of nutrients - those elements and compounds which are essential for organic production. Such materials must be added to these complex bodies of water to sustain production, since there is a net loss of water and its contents to the oceans. Enrichment from land and the ocean and the subsequent cycling of the original chemicals or their derivatives contribute to the extraordinarily high values of estuaries for human purposes. Many estuaries are able to assimilate large quantities of nutrients despite the great fluctuations which occur with variations in the flow from tributaries. The nutrients can be stored, incorporated in standing crops of plants, released, cycled and exported - and the system frequently achieves high production of plants and and animals without creation of any undesirable results of enrichment. Excessive enrichment with the same elements and compounds can, however, be highly detrimental to estuaries and their uses. Coastal cities are usually located on the estuaries which provided a harbor for the- and which now receive partially treated sewage and other wastes from the expanding population and industrial activity. Conversion of woodlands to agricultural use and the extensive application of fertilizers have resulted in the flow of large quantities of nutrients down the hill or slopes and eventually into the estuary.

Author: United States. Environmental Protection Agency
Publisher:
ISBN:
Category :
Languages : en
Pages : 1760

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Author: N. Hawley
Publisher:
ISBN:
Category : Sediment, Suspended
Languages : en
Pages : 536

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Suspended sediments collected on 4 different days in 1979 have been ,easured with a Quantimet image analyzer and identified by particle type. The data may be used to deduce changes in particle composition as a function of particle size, season of the year, and water depth

Author: North American Lake Management Society. Conference
Publisher:
ISBN:
Category : Lake restoration
Languages : en
Pages : 628

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Author: Ralph D. Cross
Publisher:
ISBN:
Category : Estuaries
Languages : en
Pages : 554

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Author: Walles Thomas Edmondson
Publisher:
ISBN:
Category : Chemical equilibrium
Languages : en
Pages : 48

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