Estuarine ecosystems cycles

Morshina, T.N., Fluoride cycles in an estuarine ecosystem, Total Environ., 17, 223, 1980. 

Due to the paucity of reports, we can only speculate on the importance of marine fungi in biogeochemical cycling. Also, because of the dependence of fungi on carbon, it can be expected that their abundance will be determined mostly by the availability of carbon, which increases from the open oceans to coastal seas, to coastal and estuarine ecosystems, such as salt marshes. No doubt partly due to their relative accessibility, salt marshes are the most studied marine ecosystems in relation to fungi. 

Banta, G. T., Pedersen, M. F., and Nielsen, S. L. (2004). Decomposition of marine primary producers Consequences for nutrient recychng and retention in coastal ecosystems. In Estuarine Nutrient Cycling The Influence of Primary Producers (Nielsen, S. L., Banta, G. T., and Pedersen, M. F. eds.). Kluwer Academic Pubhshers, Dordrecht, pp. 187—216. 

Sanders, J.G., Riedel, G.F. and Osman, R.W. (1994) Arsenic cycling and its impact in estuarine and coastal marine ecosystems, in Arsenic in the Environment Part I Cycling and Characterization (ed. J.O., Nriagu), John Wiley Sons, Ltd, New York, pp. 289-308. 

Differential metal concentrations in tissues or organs, as well as the growth rates and production of sea grasses78 and salt marsh plants,81 have been used to calculate the potential cycling/turnover of metals within a system and/or the annual export of contaminants from an estuarine environment to adjacent coastal waters. Similar studies have been performed for macroalgae23 and have provided valuable information on contaminant transport and bioavailability processes within and between aquatic ecosystems, since contaminants associated with decaying plant biomasses will become bio-available through herbivory or the detritivore food web. 

Important for understanding factors controlling the biogeochemical cycle of PCBs In the environment more specifically aquatic ecosystems Including estuaries. Our data have demonstrated this for the case of a severely polluted coastal estuarine area, both for the data discussed herein and for pore water, sediment and water column data presented and discussed elsewhere (10, 30). 

Alongi, D.M., Boto, K.G. and Robertson, A.I. (1992) Nitrogen and phosphorus cycles, in Tropical Mangrove Ecosystems (eds A.I. Robertson and D.M. Alongi), Coastal and Estuarine studies 41, American Geophysical Union, Washington, DC, pp. 251-292. 

These nutrients that are supplied from the seabed during summer are transported to the head of the bay by the estuarine circulation. Furthermore, they are again uptaken into the upper water, and are used for the increase in the phytoplanktons in the euphotic zone. Estuarine circulation plays a key role in the nutrient cycles of stratified estuaries by increasing the retention, recycling the nutrients, and stabilizing the ecosystem. ... 

Plant communities are inqjortant for maintainii the proper function of freshwater, estuarine and marine ecosystems. Algae associated with the plankton and periphyton form the base of most food chains, produce oxygen, and play inq)ortant role in cycling of nutrients (1). 

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