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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. http://dx.doi.org/10.3354/meps07948
In: Marine Ecology Progress Series. Inter-Research: Oldendorf/Luhe. ISSN 0171-8630; e-ISSN 1616-1599, meer
Peer reviewed article  
Beschikbaar in  Auteurs 
Trefwoorden
    Biological production > Primary production
    In situ tests > Field tests
    Isotopes > Carbon isotopes
    Population functions > Growth
    Seaweed
    Undaria pinnatifida (Harvey) Suringar, 1873 [WoRMS]
    Marien/Kust
Author keywords
    delta C-13; Seaweed; Primary production; Field experiment; Growthanalysis
Auteurs  Top 
  • Carvalho de Carvalho, M.
  • Hayashizaki, K.-I.
  • Ogawa, I.
Abstract
    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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