Home⇛Annals of Tropical Research⇛vol. 24 no. 2 (2002)

Survey Of Ultraviolet Radiation-Absorbing Mycosporine-Like Amino Acids In Adult Females Of Planktonic Copepods

Dorothy G Lacuna

 

Abstract:

The presence of UV-absorbing mycosporine-like amino acids (MAAS) from nine planktonic calanoid copepod species were investigated. MAA concentrations from methanol extracts of adult females were analyzed by High Performance Liquid Chromatography (HPLC). A total of 4 MAAs were identified, namely mycosporineglycine, palythine, porphyra-334 and shinorine. Although all the experimental copepods had MAAs, the occurrence of these compounds varied among species. For Acartia morii, Calanus sinicus and Pontella spinicauda, 4 MAAs were identified; Pontellopsis semuicauda and P. yamadae, had 3 MAAs while Acartia sinjiensis, Centropages abdominalis, Paracalanus sp. and Sinocalanus tenellus had only one MA?. Concentrations of total MAAs were also assessed. Total MAA concentrations ranged from 3.53 µg mgC (Pontella spinicauda) to 0.003 µg mgC- (Sinocalanus tenellus). Since UV-absorbing MAAs act as a biochemical defense or sunscreen against the harmful wavelengths of UVB, increase content ofthese compounds, specifically MAAs with UVB-absorbing properties, in all neustonic copepods (Pontella spinicauda, Pontellopsis tenuicauda and P. yamadae) may suggest a physiological adaptation to high UV exposure which is the natural condition in neustonic environment.



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