Biogeochemical Cycling and Sediment Ecology by E. A. Romankevich, A. A. Vetrov (auth.), John S. Gray, PDF

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By E. A. Romankevich, A. A. Vetrov (auth.), John S. Gray, William Ambrose Jr., Anna Szaniawska (eds.)

ISBN-10: 9401059624

ISBN-13: 9789401059626

ISBN-10: 9401146497

ISBN-13: 9789401146494

Oceanographic discontinuities (e. g. frontal structures, upwelling parts, ice edges) are frequently components of improved organic productiveness. substantial examine at the physics and biology of the actual limitations defining those discontinues has been entire (see [I D. The interface among water and sediment is the biggest actual boundary within the ocean, yet has now not acquired a proportionate measure of realization. the aim of the Nato complicated learn Workshop (ARW) used to be to target soft-sediment structures by means of determining deficiencies in our wisdom of those structures and defining key matters within the administration of coastal sedimentary habitats. Marine sediments play very important roles within the marine atmosphere and the biosphere. they supply meals and habitat for lots of marine organisms, a few of that are commercially very important. extra importantly from an international standpoint, marine sediments additionally supply "ecosystem items and prone" [2J. natural topic from basic construction within the water column and contaminants scavenged through debris gather in sediments the place their destiny relies on sediment strategies corresponding to bioturbation and biogeochemical biking. foodstuff are regenerated and contaminants degraded in sediments. below a few stipulations, carbon accumulates in coastal and shelf sediments and should through faraway from the carbon cycle for hundreds of thousands of years, having a probably major impression on worldwide weather swap. Sediments additionally guard coasts. the commercial worth of prone supplied by way of coastal parts has lately been anticipated to be at the order of $12,568 nine 10 y" [3J, a long way in way over the worldwide GNP.

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Thus the autochthonic sources are far more significant then the allochthonic. In spring the balance between pelagic and bottom production of organic matter is almost equal. In summer when rapid growth and development of seagrass beds occurs the autochthonous contribution to the organic matter supply is even higher. 12 8 10 • g 8 rc '" "'" bQ ';J Q) 1'" ] ~ I II I L x Tastubeck, sum 96 ' • Bugun' , sum 93 I Lc Tastubeck, aut 93 6 T 4 x 2 -+- x • c c x. x - ---"-+------+----+--------+------~-8 10 4 6 2 0 o J-- Depth of station Figure 10, Photosynthesis rates at stations and depths -~------ 12 14 43 3500 3000 2500 i Cl Primary production Water column, !

By the early 1990s, the zooplankton and zoobenthos communities that previously existed had been completely replaced by a system consisting of very few species which These species-poor but abundant are tolerant to environmental disturbances. planktonic and benthic communities occur in all areas of the modem Aral Sea [5]. 4. 4. 1. General estimation and selected components of the stock. Due to missing data, especially on dissolved organic matter it was not possible to assess the total organic matter stock.

1996) Geochemistry of Organic Matter in River-Sea System, Kluwer Academic Publishers, Dordrecht, 190 p. 34. Meybeck, M. ), Interaction of C, N, P and S Biogeochemical Cycles and Global Change NATO ASI Series. 14, Springer-Verlag, Berlin, 163-193. 35. 1. (1974) Global Water Resources and Their Future, Mysl, Moscow, 448 p. 36. P. 6, 19-28. 37. Meybeck, M. (1982) Carbon, nitrogen, and phosphorus transport by world rivers, Am. J. Sci. 282,401450. 38. Ittekkot, V. (1988) Global trends in the nature of organic matter in river suspensions, Nature 332, 436438.

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Biogeochemical Cycling and Sediment Ecology by E. A. Romankevich, A. A. Vetrov (auth.), John S. Gray, William Ambrose Jr., Anna Szaniawska (eds.)

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