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Carbon stable isotope discrimination: a possible growth index for the kelp Undaria pinnatifida
Carvalho de Carvalho, M.; Hayashizaki, K.-I.; Ogawa, I. (2009). Carbon stable isotope discrimination: a possible growth index for the kelp Undaria pinnatifida. Mar. Ecol. Prog. Ser. 381: 71-82.
In: Marine Ecology Progress Series. Inter-Research: Oldendorf/Luhe. ISSN 0171-8630, more
Peer reviewed article  

Available in  Authors 

    Carbon isotopes; Field tests; Growth; Primary production; Seaweed; Undaria pinnatifida (Harvey) Suringar, 1873 [WoRMS]; Marine
Author keywords
    delta C-13; Seaweed; Primary production; Field experiment; Growthanalysis

Authors  Top 
  • Carvalho de Carvalho, M.
  • Hayashizaki, K.-I.
  • Ogawa, I.

    Undaria pinnatifida sporophytes were grown in a marine bay under differing culture conditions in order to obtain individuals with different growth rates. Carbon stable isotope compositions of seawater and cultured algae were measured to calculate carbon stable isotope discrimination due to carbon assimilation (Delta) by the thalli. High and significant correlations were found between growth rates (absolute in length, absolute in weight, or relative in weight) and A, which suggests that growth rate was the most important factor determining Delta. The correlation between A and relative growth rate in weight was especially good, following the formula: Delta = 28.6 - 1.4RGR (r = -0.97), in which RGR is the relative growth rate in weight (% d(-1)). This very good correlation, if confirmed for other instances, would allow Delta to be used as a growth index for the species. Results also suggested that HCO3- uptake may be the main mechanism of inorganic carbon assimilation for the studied species.

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