{"refrec":{"BRefID":14798,"RR":"<b>Fenchel, T.</b> (1969). The ecology of marine microbenthos: 4. Structure and function of the benthic ecosystem, its chemical and physical factors and the microfauna communities with special reference to the ciliated Protoza. <i>Ophelia 6</i>: 1-182","BEntID":14798,"PublicFlag":1,"CheckedFlag":0,"wosflag":null,"vabbflag":null,"RefStringPartII":". <i>Ophelia 6</i>: 1-182","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Fenchel, T.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Fenchel, T.","Englishabstract":"The paper describes the ecosystem constituted by marine sediments and their microflora and fauna but with special emphasis on the ecology of ciliated protozoa. This description is based on quantitative studies of the vertical and horizontal distribution of the fauna, the physicochemical factors (O<sub>2</sub> H<sub>2</sub> S, Eh, pH, grain size, organic matter, salinity) and the microflora, and on model experiments with artificial and natural sediments. Factors controlling the oxidation-reduction properties of sediments, the O<sub>2</sub>-uptake of reduced sediments and the respiration and photosynthesis of undisturbed sediments were studied. Among other things it is demonstrated that the microfaunal communities can be correlated with the oxidation-reduction properties of sediments and with their mechanical composition and that the end products of anaerobic decomposition (notably H<sub>2</sub>S) are of large trophic significance to the sediment ecosystem through the activity of chemo- and photoautotrophic bacteria. 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