{"refrec":{"BRefID":135675,"RR":"<b>Durako, M.J.; Hall, M.O.</b> (1992). Effects of light on the stable carbon isotope composition of the seagrass <i>Thalassia testudinum</i>. <i>Mar. Ecol. Prog. Ser. 86</i>: 99-101. <a href=\"https://dx.doi.org/10.3354/meps086099\" target=\"_blank\">https://dx.doi.org/10.3354/meps086099</a>","BEntID":129557,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Mar. Ecol. Prog. Ser. 86</i>: 99-101. <a href=\"https://dx.doi.org/10.3354/meps086099\" target=\"_blank\">https://dx.doi.org/10.3354/meps086099</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Durako, M.J.; Hall, M.O.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Durako, M.J.; Hall, M.O.","Englishabstract":"Changes in the stable carbon isotope composition of <i>Thalassia testudinum</i> (turtle grass) leaves were measured in response to in situ light-reduction treatments in Tampa Bay, Florida, USA. Leaf delta <sup>13</sup>C values of shaded T. testudinum were significantly lower than those of unshaded controls in both shallow (0.75 m below MLW) and deep (2 m below MLW) sites. Changes in leaf delta <sup>13</sup>C were correlated with differences in the relative amount of light reaching the experimental treatments, and the magnitude of the responses increased between 1 and 3 mo after initiation of the shade treatments. Because of the close proximity of the experimental and control sites, the decrease in delta <sup>13</sup>C in response to shading probably reflects a process (i.e. isotopic fractionation) effect rather than a source (i.e. dissolved inorganic carbon) effect. Greater isotopic fractionation in shaded <i>T. testudinum</i> may reflect reduced carbon demand and, hence, greater relative availability of carbon at lower irradiances. 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