Seasonal fatty acid profile analysis to trace origin of food sources of four commercially important bivalves
Seasonal fatty acid profile analysis to trace origin of food sources of four commercially important bivalves
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DOI：
10.1016/j.aquaculture.2011.12.041
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发表时间：
2012-03-07
期刊：
影响因子：
4.5
通讯作者：
Blazina, Maria
中科院分区：
文献类型：
--
作者：
Ezgeta-Balic, Daria;Najdek, Mirjana;Blazina, Maria
双壳类食物来源的知识在水产养殖区非常重要，因为养殖物种的密度通常高于自然种群。除了浮游植物是双壳类的主要食物来源外，双壳类还可以利用碎屑、细菌和浮游动物等其他食物来源。本研究的目的是确定食物来源的四个商业上重要的双壳类物种共存于马里斯通湾-最重要的水产养殖区的东部亚得里亚海。通过对海水养殖的欧洲扁牡蛎Ostrea edulis和贻贝Mytilus galloprovincialis消化腺和肌肉组织脂肪酸组成的分析，以及对自然种群的马贻贝Modiolus barbatu.s和诺亚方舟贝壳Arca noae的分析，探讨了食物来源。消化腺脂肪酸分析表明，在春季和夏季浮游生物丰度较高的时期，所有物种的摄入主要是浮游植物，其次是浮游动物和碎屑。在低浮游生物丰度的秋冬期间，浮游动物和/或碎屑在双壳类食物中变得更加重要。肌肉的脂肪酸组成的差异，在选择性掺入多不饱和脂肪酸（PUFA）从他们的饮食。而A. noae和M.结果表明，在整个生长期内，红腹锦鸡儿体内多不饱和脂肪酸含量显著增加，O. edulis在春夏季，M.根本没有观察到这种趋势。这表明底栖物种能更好地利用摄入的食物。因为这四个物种消耗的食物来源相似，所以它们处于竞争状态。然而，由于马里斯通湾的调查物种密度很高，初级生产加上该地区其他食物来源的可用性可能足以满足所有物种的需求。研究区的水生生物完全依赖于天然的贝苗。这表明，所有物种观察到的幼虫食性可能构成对自然种群和/或商业水产养殖增长的自我调节限制。(C)2011 Elsevier B. V.保留所有权利。
Knowledge of bivalve food sources has great importance in aquaculture areas where cultured species usually occur at higher densities than in natural populations. Except phytoplankton, which is considered as their primary food sources, bivalves can use other food sources such as detritus, bacteria and zooplankton. The objective of this study was to determine food sources of four commercially important bivalve species co-existing in the Mali Ston Bay - most important aquaculture area of the eastern Adriatic Sea. Food sources were investigated by analyzing the fatty acid profiles of digestive gland and muscle tissues of the European flat oyster Ostrea edulis and the black mussel Mytilus galloprovincialis, cultured in the water column, and the bearded horse mussel Modiolus barbatu.s and Noah's ark shell Arca noae from natural populations. Digestive gland fatty acid analysis revealed that during the period of higher plankton abundance in spring and summer, all species ingested mainly phytoplankton followed by zooplankton and detritus. During the low plankton abundance of the autumn-winter period zooplankton and/or detritus became more important in a bivalve diet. Fatty acid composition of muscles indicated differences in selective incorporation of polyunsaturated fatty acid (PUFA) from their diets. While A. noae and M. barbatus accumulated significantly PUFAs during all and O. edulis during spring-summer period, in M. galloprovincialis this tendency was not observed at all. This suggested better utilization of ingested food in bottom-dwelling species. Because all four species consumed similar food sources they were in competition. However, as investigated species in Mali Ston Bay exist in high density, primary production plus the availability of other food sources in this area was probably sufficient to satisfy demands for all species. Aquaculture in the study area depends wholly on natural spat. This suggests that larviphagy, observed for all species, might constitute a self-regulating restriction to natural populations and/or commercial aquaculture growth. (C) 2011 Elsevier B.V. All rights reserved.