The information of trophic relationship is important for studying the Southern Ocean ecosystems. In this study, three dominant krill species, Euphausia superba, Thysanoessa macrura and Euphausia crystallorophias, were...The information of trophic relationship is important for studying the Southern Ocean ecosystems. In this study, three dominant krill species, Euphausia superba, Thysanoessa macrura and Euphausia crystallorophias, were collected from Prydz Bay, Antarctica, during austral summer of 2009/2010. The composition of fatty acids in these species was studied. E. superba and T. macrura showed a similar fatty acid composition which was dominated by C140, C16：0, EPA （eicosapentenoic acid） and DHA （decosahexenoic acid） while E. crystallorophias showed higher contents of C 18：1（n-9）, C 18： 1 （n-7）, DHA and EPA than the former two. Higher fatty acid ratios of C 18：1（n-9）/18：1（n-7）, PUFA （polyunsaturated fatty acid）/SFA （saturated fatty acid）, and 18PUFA/16PUFA indicated that E. crystallorophias should be classified as a typical onmivore with a higher trophic position compared with E. superba and T. rnacrura.展开更多
基金supported by Polar Project of State Oceanic Administration,China (CHINARE2013-01-05-02 and CHINARE2013-04-01-05)the National Natural Science Foundation of China (41206180)
文摘The information of trophic relationship is important for studying the Southern Ocean ecosystems. In this study, three dominant krill species, Euphausia superba, Thysanoessa macrura and Euphausia crystallorophias, were collected from Prydz Bay, Antarctica, during austral summer of 2009/2010. The composition of fatty acids in these species was studied. E. superba and T. macrura showed a similar fatty acid composition which was dominated by C140, C16：0, EPA （eicosapentenoic acid） and DHA （decosahexenoic acid） while E. crystallorophias showed higher contents of C 18：1（n-9）, C 18： 1 （n-7）, DHA and EPA than the former two. Higher fatty acid ratios of C 18：1（n-9）/18：1（n-7）, PUFA （polyunsaturated fatty acid）/SFA （saturated fatty acid）, and 18PUFA/16PUFA indicated that E. crystallorophias should be classified as a typical onmivore with a higher trophic position compared with E. superba and T. rnacrura.
