Influence of isotope fractionation on the nitrogen isotope composition of the brown macroalga Undaria pinnatifida

Hikaru Endo, Hideki Fukuda, Daisuke Takahashi, Yutaka Okumura, Eri Inomata, Kinuko Ito, Chikage Yoshimizu, Ichiro Tayasu, Toshi Nagata

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Although the stable nitrogen isotope ratio (δ15N value) of macroalgae is used to indicate sources of dissolved inorganic nitrogen in coastal marine environments, little is known about the effects of isotope fractionation on the δ15N value. We compared the δ15N values of Undaria pinnatifida cultivated at an inner bay and an exposed site (sites A and B, respectively) in Shizugawa Bay on the northeastern Pacific coast of Japan. Values for algal growth indicators, including thallus length, area, and weight, were higher at site B than at site A. The δ15N value of U. pinnatifida was significantly lower at site B (4.7 ± 1.0‰; mean ± standard deviation) than at site A (6.7 ± 0.4‰). This difference in the δ15N value of U. pinnatifida could not be explained by the δ15N value of seawater NO3 (source isotopic signature), which was similar at the two sites (7.5 ± 0.3‰). The pooled data from the two sites indicated that the δ15N value of U. pinnatifida decreased with increasing thallus size. The results suggest that the δ15N value of U. pinnatifida is influenced by isotope fractionation.

Original languageEnglish
Pages (from-to)262-268
Number of pages7
JournalPhycological Research
Volume66
Issue number4
DOIs
Publication statusPublished - 2018 Oct

Keywords

  • current speed
  • isotope fractionation
  • marine macroalgae
  • seaweed aquaculture
  • stable nitrogen isotope ratio

ASJC Scopus subject areas

  • Aquatic Science
  • Agricultural and Biological Sciences (miscellaneous)
  • Plant Science

Fingerprint Dive into the research topics of 'Influence of isotope fractionation on the nitrogen isotope composition of the brown macroalga Undaria pinnatifida'. Together they form a unique fingerprint.

Cite this