{"refrec":{"BRefID":57131,"RR":"<b>Pierini, S.A.; Thomaz, S.M.</b> (2004). Effects of inorganic carbon source on photosynthetic rates of <i>Egeria najas</i> Planchon and <i>Egeria densa</i> Planchon (Hydrocharitaceae). <i>Aquat. Bot. 78(2)</i>: 135-146. <a href=\"http://dx.doi.org/10.1016/j.aquabot.2003.09.007\" target=\"_blank\">http://dx.doi.org/10.1016/j.aquabot.2003.09.007</a>","BEntID":54710,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>Aquat. Bot. 78(2)</i>: 135-146. <a href=\"https://dx.doi.org/10.1016/j.aquabot.2003.09.007\" target=\"_blank\">https://dx.doi.org/10.1016/j.aquabot.2003.09.007</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":1,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Pierini, S.A.; Thomaz, S.M.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Pierini, S.A.; Thomaz, S.M.","Englishabstract":"The ability of two submerged freshwater macrophyte species, Egeria najas Planchon and Egeria densa Planchon to use HCO<sub>3</sub><sup>−</sup> as a source of inorganic carbon for photosynthesis was assessed by a pH drift experiment. The pH values and different HCO<sub>3</sub><sup>−</sup> concentrations were set up at the beginning of the experiments, in low and high alkalinities (ca. 100 and 800µmol). Results of pH drift experiment and [CT]/Alk quotient indicated that both species used HCO<sub>3</sub><sup>−</sup> and were adapted to low inorganic carbon availability. Nevertheless, different efficiencies of HCO<sub>3</sub><sup>−</sup> use were evident based on the photosynthesis rates and pH values attained at the end of the experiments. Higher photosynthesis rates and pH values were observed in the presence of <i>E. najas</i> both at low and high alkalinities. Both species used more efficiently HCO<sub>3</sub><sup>−</sup> in high alkalinity. The results suggest that the efficiency in using HCO<sub>3</sub><sup>−</sup> depends on the concentration of this ion in water uptake ability of these species. Both <i>E. najas</i> and <i>E. densa</i> preferred CO<sub>2</sub> in both alkalinities. By adjusting the data with a Michaelis-Menten equation, it was shown that <i>E. najas</i> is slightly more efficient in using CO<sub>2</sub> than <i>E. densa</i>, when the concentrations of this dissolved gas in water are low. Thus, the low CO<sub>2</sub> concentrations characteristic of several Brazilian freshwater ecosystems may be advantageous to the colonization of <i>E. najas</i>, compared to <i>E. densa</i>.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Effects of inorganic carbon source on photosynthetic rates of <i>Egeria najas</i> Planchon and <i>Egeria densa</i> Planchon (Hydrocharitaceae)","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2025-07-02 08:58:19.190595","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"Egeria najas; Egeria densa; photosynthesis; inorganic carbon; rootedmacrophytes","OtherDescriptors":null,"Notes":null,"AnaPub":2004,"MonPub":null,"DateUpdate":"2018-05-17","DateCreate":"2004-02-03","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000188601200003","VABBcode":null,"OpenAcc":0},"refs":null,"anarec":{"AnaID":57131,"PubliDate":2004,"Pagination":"135-146","XtraPublOfAnaID":null,"ISBN":null,"Volume":"78","Issue":"2","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":42195,"SerRR":"Aquatic Botany. 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