{"refrec":{"BRefID":142082,"RR":"<b>Durako, M.J.; Sackett, W.M.</b> (1993). Effects of CO<sub>2(aq)</sub> on the carbon isotopic composition of the seagrass <i>Thalassia testudinum</i> Banks ex Koenig (Hydrocharitaceae). <i>J. Exp. Mar. Biol. Ecol. 169(2)</i>: 167-180","BEntID":135330,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>J. Exp. Mar. Biol. Ecol. 169(2)</i>: 167-180","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Durako, M.J.; Sackett, W.M.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Durako, M.J.; Sackett, W.M.","Englishabstract":"The effects of free CO<sub>2</sub> (CO<sub>2(aq)</sub>) on photosynthetic carbon isotopic fractionation of the seagrass <i>Thalassia testudinum</i> were examined using four marine mesocosms at the University of Rhode Island Marine Ecosystems Research Laboratory (MERL). Seedlings and 1-yr-old plants were cultured without substrate for 57 days in seawater media with unmanipulated CO<sub>2(aq)</sub> levels and approximately 2X, 4X and 10X equilibrium (i.e. 11 mu m CO<sub>2(aq)</sub>) levels. Fractionation of stable carbon isotopes generally increased as a function of CO<sub>2 (aq)</sub>), ranging from 12.1 to 21.0 ppt for the year-old plants and from 8.1 to 15.4% ppt for the seedlings. The larger isotopic fractionation effects exhibited by the year-old plants, as compared to those exhibited by seedlings, may have reflected reduced contributions of isotopically heavy seed reserves. Because of inter-mesocosm pH variability, mean CO<sub>2(aq)</sub>) levels in the unmanipulated mesocosm were about 15% higher, although mean levels of total dissolved inorganic carbon were about 24% lower, than in the 2X mesocosm. Comparatively larger fractionations exhibited by seedlings and year-old plants in the unmanipulated mesocosm suggest a greater importance for CO<sub>2(aq)</sub>) and a correspondingly lower relative importance of HCO<sub>3</sub><sup>-</sub> as the initial substrate for carbon fixation in this species.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Effects of CO<sub>2(aq)</sub> on the carbon isotopic composition of the seagrass <i>Thalassia testudinum</i> Banks ex Koenig (Hydrocharitaceae)","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2024-12-10 01:33:17.368041","timezone_type":1,"timezone":"+01:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":1993,"MonPub":null,"DateUpdate":"2009-11-17","DateCreate":"2009-11-17","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":0},"refs":null,"anarec":{"AnaID":142082,"PubliDate":1993,"Pagination":"167-180","XtraPublOfAnaID":null,"ISBN":null,"Volume":"169","Issue":"2","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":43229,"SerRR":"Journal of Experimental Marine Biology and Ecology. Elsevier: New York.  ISSN 0022-0981; e-ISSN 1879-1697","StandardTitleSer":"Journal of Experimental Marine Biology and Ecology","ISSN":"0022-0981","AbbrevSer":"J. Exp. Mar. Biol. 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