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Internal variations in nutrient concentrations and the C and N stable isotope ratios in leaves of the seagrass Enhalus acoroides
Yamamuro, M.; Umezawa, Y.; Koike, I. (2004). Internal variations in nutrient concentrations and the C and N stable isotope ratios in leaves of the seagrass Enhalus acoroides. Aquat. Bot. 79(1): 95-102. dx.doi.org/10.1016/j.aquabot.2004.01.007
In: Aquatic Botany. Elsevier Science: Tokyo; Oxford; New York; London; Amsterdam. ISSN 0304-3770, more
Peer reviewed article  

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Keywords
    Carbon 13; Carbon cycle; Nitrogen; Nitrogen isotopes; Nutrients (mineral); Phosphorus; Sea grass; Enhalus acoroides (Linnaeus f.) Royle, 1839 [WoRMS]; ISEW, Thailand [Marine Regions]; Marine

Authors  Top 
  • Yamamuro, M.
  • Umezawa, Y.
  • Koike, I.

Abstract
    We analyzed the content of tissue nutrients (carbon, nitrogen, and phosphorus), the C:N:P ratio, the carbon stable isotope ratio (δ13C) and the nitrogen stable isotope ratio (δ15N) of leaves of Enhalus acoroides (L. f.) Royle growing in two submerged beds in southwest Thailand. The N and P concentrations and δ15N decreased with increasing distance along the leaf. The maximum ranges in one leaf were 1.80-4.05% for N, 2.85-6.64 mg g-1 for P, and 1.28-2.93pm for δ15N. The C:N, C:P, and N:P ratios increased as the distance along the leaf increased. The maximum ranges in one leaf were 12.5-24.3 for C:N, 162-622 for C:P, and 14.0-28.9 for N:P. In contrast, C concentration and δ13C fluctuated with distance along the leaf, and the longest leaves from each beds showed similar patterns of fluctuation. The variation of the chemical signature within leaves suggests that special attention is needed to apply these data to the evaluation of nutrient conditions during growth in food-web analyses involving seagrass beds.

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