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

doi:10.1111/pre.12332

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 journal › Article › peer-review

3 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 language	English
Pages (from-to)	262-268
Number of pages	7
Journal	Phycological Research
Volume	66
Issue number	4
DOIs	https://doi.org/10.1111/pre.12332
Publication status	Published - 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

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1111/pre.12332

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@article{c1ae9a8acf154875a16ede16a3df2fa6,

title = "Influence of isotope fractionation on the nitrogen isotope composition of the brown macroalga Undaria pinnatifida",

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.",

keywords = "current speed, isotope fractionation, marine macroalgae, seaweed aquaculture, stable nitrogen isotope ratio",

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

note = "Funding Information: H. Takasu and N. Sato of the University of Tokyo helped measure the stable nitrogen isotope ratio of NO3. A. Horikoshi and H. Suzuki of Tohoku University assisted with algae sampling, while H. Takahashi of Miyagi Fisheries Cooperative cultivated the algae. This study was supported by the Tohoku Ecosystem-Associated Marine Sciences (TEAMS) initiative of the Japan Ministry of Education, Culture, Sports, Science and Technology, and the Japan Science and Technology Agency CREST program, grant numbers JPMJCR13A4 and JPMJCR13A3. Publisher Copyright: {\textcopyright} 2018 Japanese Society of Phycology",

year = "2018",

month = oct,

doi = "10.1111/pre.12332",

language = "English",

volume = "66",

pages = "262--268",

journal = "Phycological Research",

issn = "1322-0829",

publisher = "John Wiley and Sons Inc.",

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TY - JOUR

T1 - Influence of isotope fractionation on the nitrogen isotope composition of the brown macroalga Undaria pinnatifida

AU - Endo, Hikaru

AU - Fukuda, Hideki

AU - Takahashi, Daisuke

AU - Okumura, Yutaka

AU - Inomata, Eri

AU - Ito, Kinuko

AU - Yoshimizu, Chikage

AU - Tayasu, Ichiro

AU - Nagata, Toshi

N1 - Funding Information: H. Takasu and N. Sato of the University of Tokyo helped measure the stable nitrogen isotope ratio of NO3. A. Horikoshi and H. Suzuki of Tohoku University assisted with algae sampling, while H. Takahashi of Miyagi Fisheries Cooperative cultivated the algae. This study was supported by the Tohoku Ecosystem-Associated Marine Sciences (TEAMS) initiative of the Japan Ministry of Education, Culture, Sports, Science and Technology, and the Japan Science and Technology Agency CREST program, grant numbers JPMJCR13A4 and JPMJCR13A3. Publisher Copyright: © 2018 Japanese Society of Phycology

PY - 2018/10

Y1 - 2018/10

N2 - 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.

AB - 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.

KW - current speed

KW - isotope fractionation

KW - marine macroalgae

KW - seaweed aquaculture

KW - stable nitrogen isotope ratio

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U2 - 10.1111/pre.12332

DO - 10.1111/pre.12332

M3 - Article

AN - SCOPUS:85050587897

SN - 1322-0829

VL - 66

SP - 262

EP - 268

JO - Phycological Research

JF - Phycological Research

IS - 4

ER -

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

Abstract

Keywords

ASJC Scopus subject areas

UN SDGs

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