Vol. 49 No. 2, 2010
Lipid and Fatty Acid Compositions of Mytilus galloprovincialis Cultured in the Mar Grande of Taranto (Southern Italy): Feeding Strategies and Trophic Relationships
Ermelinda Prato1,*, Antonio Danieli2, Michele Maffia2, and Francesca Biandolino1
1Institute for Coastal Marine Environment, Section of Taranto, Via Roma 3, Taranto 74100, Italy
of General Physiology, Department of Biological and Environmental
Science and Technology, University of Lecce, Monteroni, Lecce I-73100,
Ermelinda Prato, Antonio Danieli, Michele Maffia, and Francesca Biandolino (2010) Lipid and fatty acid (FA) compositions were determined in the mussel Mytilus galloprovincialis
collected from June 2006 to May 2007 in the Mar Grande of Taranto,
southern Italy. Total lipids significantly differed throughout
the study period (ANOVA, p
< 0.05), with higher values in summer (24.7% dry weight (DW)) and
the lowest values in winter (3.5% DW). Triacylglycerols (TAGs)
were the dominant lipid class in spring and summer accounting for
55.28% and 60.3% of total lipids, respectively, while in the autumn and
winter phospholipids (PLs) were considerably greater than TAGs,
comprising 55.16% and 47.5% of total lipids, respectively.
Cholesterol did not show large variations over the seasons.
Predominant FAs were saturated FAs (SAFAs) followed by monounsaturated
FAs (MUFAs). The amount of polyunsaturated FAs (PUFAs) was
low. The 14:0, 16:0, 18:0, and 22:0 SAFAs, together with 14:1,
16:1ω7, 18:1ω9, 18:1ω7, 20:1ω9, and 24:1ω9 MUFAs, and the PUFA,
non-methylene interrupted dienoic (NMID), were the most abundant
FAs. FA biomarkers are frequently used to identify trophic
relationships among marine invertebrates. In order to obtain
indications on food sources of M. galloprovincialis,
a variety of FA ratios and the sum of some FAs were determined.
The sum of 18:1ω7 + odd-branched FAs indicated a moderate bacterial
contribution to the mussel diet. A high 18:1ω9/18:1ω7 ratio
together with a high level of 20:1ω9 indicated an animal dietary
input. Trophic markers suggested lows contribution of diatoms and
dinoflagellates to the diet of M. galloprovincialis.
Key words: Lipid composition, Mussels, Seasonal variations, Trophic markers.