{"refrec":{"BRefID":133186,"RR":"<b>Sommer, U.</b> (1994). Are marine diatoms favoured by high Si:N ratios? <i>Mar. Ecol. Prog. Ser. 115</i>: 309-315. <a href=\"https://dx.doi.org/10.3354/meps115309\" target=\"_blank\">https://dx.doi.org/10.3354/meps115309</a>","BEntID":127156,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":1,"RefStringPartII":" <i>Mar. Ecol. Prog. Ser. 115</i>: 309-315. <a href=\"https://dx.doi.org/10.3354/meps115309\" target=\"_blank\">https://dx.doi.org/10.3354/meps115309</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Sommer, U.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Sommer, U.","Englishabstract":"Competition experiments were performed first with 4, then with 11 species of marine phytoplankton at various ratios of silicate: nitrate and various light intensities. Diatoms became dominant at Si:N ratios >25:1 while flagellates were the superior competitors at lower ratios. The light supply did not influence the competitive position of diatoms and non-siliceous flagellates in general, while it was important in determining the outcome of competition at the species level. In the 11 species experiments, <i>Stephanopyxis palmeriana</i> was the dominant diatom at high light intensities. It shared dominance with <i>Lauderia annulata</i> at medium and low light intensities and high Si:N ratios. <i>Pseudonitzschia pungens</i> was the dominant diatom at low light intensities and relatively low Si:N ratios. 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