Characterization of polychaetes inhabiting estuaries and inner bays by composition analysis of amino acids and lactate enantiomers
Onozato, M.; Shinohara, W.; Osaka, Y.; Sakamoto, T.; Umino, M.; Nishigaki, A.; Okoshi, K.; Fukushima, T. (2024). Characterization of polychaetes inhabiting estuaries and inner bays by composition analysis of amino acids and lactate enantiomers. NPG Scientific Reports 14(1): 5494. https://dx.doi.org/10.1038/s41598-024-55861-5
In: Scientific Reports (Nature Publishing Group). Nature Publishing Group: London. ISSN 2045-2322; e-ISSN 2045-2322, more
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| Keywords |
Hediste diadroma Sato & Nakashima, 2003 [WoRMS]; Scoletoma nipponica (Imajima & Higuchi, 1975) [WoRMS]; Tylorrhynchus osawai (Izuka, 1903) [WoRMS]
Marine/Coastal |
| Authors | | Top |
- Onozato, M.
- Shinohara, W.
- Osaka, Y.
- Sakamoto, T.
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- Umino, M.
- Nishigaki, A.
- Okoshi, K.
- Fukushima, T.
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| Abstract |
In this study, we investigated the composition of free amino acids and lactate (Lac) in polychaetes in river estuaries and inner bays using chromatographic techniques. Both l-amino acids and d-amino acids (d-asparagine, d-alanine (d-Ala), d-serine, d-aspartic acid, and d-proline (d-Pro)) were detected, indicating that polychaetes contain some d-amino acids. Some polychaete species exhibited notable amino acid levels, such as glycine in Capitellidae sp. and Thelepus sp., d-Pro in Glycera sp., and β-Ala in Scoletoma nipponica and Scoletoma sp.. High d-Lac levels were detected in Tylorrhynchus osawai and Hediste diadroma, (691 and 797 μmol/100 g-wet, respectively), with the d-form exceeding 98%. T. osawai was dominant in the upper tidal-sensitive zone, wherein other organisms were less abundant because of low salinity (3–8 PSU). Seasonal differences in the concentrations of components in T. osawai were observed, particularly a significant increase in d-Lac in the reproductive period. Notably, the d-Lac concentrations of T. osawai were higher upstream than downstream. Thus, d-Lac might be involved in strategies underlying adaptations to low salinity and reproductive activity. These results suggest that both the d-form of Lac and amino acids may play certain physiological roles in the life of polychaetes. |
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