The use of bulk and compound specific isotopes of nutrients and organisms to estimate the feeding and swimming behavior of the coastal fishes

• Project/Area Number: 24780190
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: General fisheries
• Research Institution: Nagasaki University
• Principal Investigator: UMEZAWA Yu 長崎大学, 大学院 水産・環境科学総合研究科, 准教授 (50442538)
• Research Collaborator: KAWABE Ryo 長崎大学, 大学院水産環境科学総合研究科, 教授 (80380830)
• Project Period (FY): 2012-04-01 – 2014-03-31
• Project Status: Completed (Fiscal Year 2013)
• Budget Amount: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000); Fiscal Year 2013: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2012: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
• Keywords: アミノ酸同位体 / バルク同位体 / 近海魚類 / 生態・行動 / 硝酸同位体

Research Abstract

Stable carbon and nitrogen isotopes (d13C,d15N) in the muscle tissues of the Japanese flounders, the movement of which had been identified based on the high-frequency depth data loggers, were analyzed and interpreted with d13C & d15N in particulate organic matter (POM) collected around Nagasaki and d15N in specific amino acids (phenylalanine and glutamic acid) in the same muscle tissues. It was suggested that the difference of bulk isotopes in the flounders reflected the values of primary producers supporting the food web, rather than the difference of the trophic levels among the flounders targeted. This study successfully indicated that the bulk isotopes in the coastal fishes can be used as one of good indicator to identify their swimming and feeding behaviors at the coastal areas with spatial variation of d13C and d15N in primary producers.

Research Products

• [Journal Article] Seasonal shifts in the contributions of the Changjiang River and the Kuroshio Current to nitrate dynamics in the continental shelf of the northern East China Sea based on a nitrate dual isotopic composition approach (2014)
  • Author(s): Umezawa Y., Yamaguchi, A., Ishizaka, J., Hasegawa, T., Yoshimizu, C., Tayasu, I., Yoshimur, H., Morii, Y., Aoshima, T., and Yamawaki, N.
  • Journal Title: Biogeosciences Volume: 11 Issue: 4 Pages: 1297-1317
  • DOI: 10.5194/bg-11-1297-2014
  • NAID: 120006986534
  • Peer Reviewed
• [Journal Article] 有明海西岸域への地下水由来の栄養塩供給量の評価 (2013)
  • Author(s): 塩川麻保, 山口聖, 梅澤有
  • Journal Title: 沿岸海洋研究 Volume: 50(2) Pages: 85-95
  • NAID: 130007797376
  • Peer Reviewed
• [Presentation] Food source and habitat conditions of the larvae of the ghost shrimp Nihonotrypaea harmandi, estimated based on stable isotopes analysis of bulk and amino acids (2014)
  • Author(s): Umezawa Y, Tamaki A, Kiyama K, Hiramatsu D, Suzuki T, Somiya R, Matsuo H, Okamura K, Yoshimizu C and Tayasu I
  • Organizer: Ocean Science Meeting
  • Place of Presentation: Honolulu, USA
  • Year and Date: 2014-02-28
• [Presentation] Diet and behavior of finless porpoises, in Western Kyushu, Japan, based on stable isotopes analyses of bulk and amino acids (2014)
  • Author(s): Goto, H., Umezawa, Y., Amano, M., Yoshimizu, C., and Tayasu, I
  • Organizer: Ocean Science Meeting
  • Place of Presentation: Honolulu, USA
  • Year and Date: 2014-02-28
• [Presentation] Diet of Finless Porpoises, Neophocaena Phocaenoides, in Western Kyushu, JAPAN, combined δ15N analysis of bulk with δ15N of amino acids (2014)
  • Author(s): Goto, H., Umezawa, Y., Amano M. Yoshimizu, C., Tayasu, I.
  • Organizer: Ocean Science Meeting
  • Place of Presentation: ハワイコンベンションセンター（アメリカ合衆国）
• [Presentation] Food source (and inhabiting environment) of the larvae of the ghost shrimp Nihonotrypaea harmandiin, estimated based on stable isotopes analysis of bulk and amino acids. (2014)
  • Author(s): Umezawa Y, Tamaki, K. Kiyama, D. Hiramatsu, T. Suzuki, R. Somiya, H. Matsuo, K. Okamura, C. Yoshimizu, and I. Tayasu
  • Organizer: Ocean Science Meeting
  • Place of Presentation: ハワイコンベンションセンター（アメリカ合衆国）