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Characterization of polychaetes inhabiting estuaries and inner bays by composition analysis of amino acids and lactate enantiomers
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Characterization of polychaetes inhabiting estuaries and inner bays by composition analysis of amino acids and lactate enantiomers
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Journal Article
Characterization of polychaetes inhabiting estuaries and inner bays by composition analysis of amino acids and lactate enantiomers
2024
Overview
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.
