By S K Jain
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Plankton community, detritus) and hence, the fatty acid profiles of mussels in Victoria Harbour differed from those at the reference sites, suggesting that different water qualities still existed between within and outside the harbour areas. The present findings showed that the gonad and soma of mussels from the six sites exhibited similar inter-site differences and seasonal changes in fatty acid profiles. The fatty acid profiles of mussels were affected by their diets, which, in turn, depended on the composition of TPMs in the water column.
05, 05: May 05, 07: Jul. 05; G: gonad. Repeated-measures MANOVA were performed to find the overall inter-site and seasonal differences in each fatty acid in the gonads of the mussels. For inter-site differences, the percentages of SFAs 14:0 and 16:0 were the highest at PC and the lowest at NP and C. For SFA 18:0, the percentages at the reference sites (PC and TLC) were significantly higher than those at the other sites. For MUFAs 16:1n7 and 18:1n7 and PUFAs 18:3n3 and 20:5n3, the percentages at the reference sites were significantly higher than that in Victoria Harbour except for KT.
This showed that mussels tended to reserve SFAs 14:0 and 16:0 in soma and leaded to a slower decrease in these two fatty acids. For gonads, the percentage of SFA 18:0 was also the lowest in January 2005 but the percentages of SFAs 14:0 and 16:0 Inter-Site Differences and Seasonal Patterns… 37 were the lowest in May 2005. This implied that mussels tended to use their reserve of SFAs in the soma first, before utilizing those from the gonad. The percentage of MUFA 16:1n7, a marker of diatoms, was higher in the summer than in the winter, suggesting that the concentration of diatoms was high in the summer.