Correlations between mercury concentration, and stable isotope ratios of carbon and nitrogen of amino acids in scalp hair from whale meat eaters and heavy fish eaters

2017 ◽  
Vol 31 (9) ◽  
pp. 745-752 ◽  
Author(s):  
Tetsuya Endo ◽  
Hideki Ogasawara ◽  
Moriaki Hayasaka ◽  
Yohei Hotta ◽  
Osamu Kimura ◽  
...  
Keyword(s):  
Amino Acids ◽  
Stable Isotope ◽  
Mercury Concentration ◽  
Scalp Hair ◽  
Isotope Ratios ◽  
Stable Isotope Ratios ◽  
Carbon And Nitrogen

Assessment of diabetics by the quantification of essential elements and stable isotope ratios of carbon and nitrogen in scalp hair

2019 ◽  
Vol 15 ◽  
pp. 100106
Author(s):  
Yohei Hotta ◽  
Ryoji Fujino ◽  
Osamu Kimura ◽  
Yukiko Fujii ◽  
Koichi Haraguchi ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Scalp Hair ◽  
Isotope Ratios ◽  
Essential Elements ◽  
Stable Isotope Ratios ◽  
Carbon And Nitrogen

TRANSFER EFFICIENCY FROM PRIMARY PRODUCERS TO RUDITAPES PHILIPPINARUM ON AN INTERTIDAL FLAT IN HIROSHIMA BAY, JAPAN

2017 ◽  
Author(s):  
Sosuke Otani ◽  
Sosuke Otani ◽  
Akira Umehara ◽  
Akira Umehara ◽  
Haruka Miyagawa ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Secondary Production ◽  
Isotope Ratios ◽  
Ruditapes Philippinarum ◽  
Transfer Efficiency ◽  
Food Sources ◽  
Stable Isotope Ratios ◽  
Primary Producers ◽  
Nitrogen Stable Isotope ◽  
Carbon And Nitrogen

Fish yields of Ruditapes philippinarum have been decreased and the resources have not yet recovered. It needs to clarify food sources of R. philippinarum, and relationship between primary and secondary production of it. The purpose on this study is to reveal transfer efficiency from primary producers to R. philippinarum and food sources of R. philippinarum. The field investigation was carried out to quantify biomass of R. philippinarum and primary producers on intertidal sand flat at Zigozen beach in Hiroshima Bay, Japan. In particular, photosynthetic rates of primary producers such as Zostera marina, Ulva sp. and microphytobenthos were determined in laboratory experiments. The carbon and nitrogen stable isotope ratios for R. philippinarum and 8 potential food sources (microphytobenthos, MPOM etc) growing in the tidal flat were also measured. In summer 2015, the primary productions of Z. marina, Ulva sp. and microphytobenthos were estimated to be 70.4 kgC/day, 43.4 kgC/day and 2.2 kgC/day, respectively. Secondary production of R. philippinarum was 0.4 kgC/day. Contribution of microphytobenthos to R. philippinarum as food source was 56-76% on the basis of those carbon and nitrogen stable isotope ratios. Transfer efficiency from microphytobenthos to R. philippinarum was estimated to be 10-14%. It was suggested that microphytobenthos might sustain the high secondary production of R. philippinarum, though the primary production of microphytobenthos was about 1/10 compared to other algae.

Global dataset for carbon and nitrogen stable isotope ratios of lotic periphyton

2018 ◽  
Vol 33 (6) ◽  
pp. 1089-1089
Author(s):  
Naoto F. Ishikawa ◽  
Hideyuki Doi ◽  
Jacques C. Finlay
Keyword(s):  
Stable Isotope ◽  
Isotope Ratios ◽  
Stable Isotope Ratios ◽  
Nitrogen Stable Isotope ◽  
Carbon And Nitrogen
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