Eutrophication coastal ecosystems

As eutrophication proceeds in response to nutrient enrichment and depending upon water residence time in coastal ecosystems there may be a shift in autotrophic dominance from rooted macrophytes to perennial macroalgae to ephemeral macroalgae and finally to phytoplankton (McGlathery et al., 2004 Valiela et al., 1997) and... 

Lyngby, J. E., Mortensen, S., and Ahrensberg, N. (1999). Bioassessment techniques for monitoring of eutrophication and nutrient limitation in coastal ecosystems. Mar. Pollut. Bull. 39, 212-223. 

Nr is responsible for eutrophication, hypoxia, loss of biodiversity, and habitat degradation in coastal ecosystems. Nr is now considered the biggest pollution problem in coastal waters (e.g., Howarth et al., 2000 NRC, 2000 Rabalais, 2002). 

Schiewer, U., 2001. Recent changes in northern German lagoons with special reference to eutrophication. In Schemewski, G., Schiewer, U., (Eds.), Baltic Coastal Ecosystems. Springer, Berlin, pp. 19-30. 

Nixon, S.W., Pilson, M.E.Q., Oviatt, C.A., Donaghay, P., Sullivan, B., Seitzinger, S., Rudnick, D. and Frithsen, 3., 1984. Eutrophication of a Coastal Marine Ecosystem- An experimental study using the MERL microcosms. In M.3.R. Fasham (ed.), Flows of Energy and Materials in Marine Ecosystems. Plenum Publishing Corporation, NY, pp. 105-135. 

Here we present one example to illustrate the utility of 15N for providing information about the source of dissolved organic nitrogen in a freshwater ecosystem. The 15N contents of fulvic acid fractions of different size varied slightly and were similar to the value for the 15N content of the synfulvic acid fraction in a eutrophic coastal pond in Antarctica (Table I) (Brown et al., 2002). Continuous production of mucilage by the chlorophyte population in the pond and diffusion of DOM from the sediments are the two main DOM sources these data suggest that the same source predominates for all of these fulvic acid fractions. 

Jprgensen, B.B. (1996) Material flux in the sediments. In Eutrophication in Coastal Marine Ecosystems (Jprgensen, B.B., and Richardson, K., eds.), pp. 115-135, American Geophysical Union, Washington, DC. 

Oviatt, C.A., Lane, P., French, F., and Donaghay, P. (1989) Phytoplankton species and abundance in response to eutrophication in coastal marine ecosystems. J. Plankton Res. 11, 1223-1244. 

A decade later, the Black Sea ecosystem continues to be threatened by different chemical pollutants, mainly by nutrients that enter the Black Sea through rivers from land based sources. The Danube River accounts for about a half of the nutrient input to the Black Sea. As a result eutrophication occurs over wide areas of the Black Sea, in particular, in its northwestern part. Inputs of microbiological contaminants with insufficiently treated sewage result in a potential threat to public health as tourism continues to develop in the coastal zone. Satellite SAR imagery and related statistics of oil spills show... 

Maranon E, Cermeno P, Fernandez E, Rodriguez J, Za-bala L (2004) Significance and mechanisms of photosynthetic production of dissolved organic carbon in a coastal eutrophic ecosystem. Limnol Oceanogr 49 1652-1666... 

The theoretical models considering the influence of (algal) viruses on the carbon cycle that exist to date are steady-state models assuming a fixed percentage of the algal population dying due to viral lysis. A bloom of Phaeocystis in, for example, temperate eutrophic coastal waters is, however, clearly not a steady-state situation. Based on the ecosystem model by Ruardij et al. (2005), we established a carbon budget for the main players... 

Boynton, W. R., and Kemp, W. M. (2000). Influence of river flow and nutrient loads on selected ecosystem processes A synthesis of Chesapeake Bay data. In . E. Hobbie, ed. Estuarine Science A Synthetic Approach to Research and Practice. Washington, DC Island Press, pp. 269—298. Bricker, S. B., Clement, C. G., PirhaHa, D. E., Orlando, S. P., and Farrow, D. R. G. (1999). National Estuarine Eutrophication Assessment Effects of Nutrient Enrichment in the Nation s Estuaries. NOAA, National Ocean Service, Special Projects Office, and the National Centers for Coastal Ocean Science, Silver Spring, MD. 

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