Promjene sastava masnih kiselina u algi Fucus virsoides J. Agardh na različitim podlogama

Abstract

The effect of the substratum type (natural, limestone, or artificial, concrete) on the fatty acid composition of Fucus virsoides in six habitats around the harbours and beaches of the Istrian coast (northern Adriatic Sea) was investigated during the summer, the period of maximum development. All habitats of F. virsoides were regulated by very similar environmental factors and were exposed to moderate anthropogenic influences. F. virsoides growing on artificial substrata was characterised by lower concentrations of fatty acids, lower proportions of fatty acids among total lipids, higher C16:0/18:1 ratios (FA: 6.7±0.6 mg g-1 d.w.; FA/TL: 22%; 16:0/18:1: 0.57±0.08) and an overall increase in saturation in comparison to communities growing on natural substrata (FA: 10.2±2.9–12.5±3.4 mg g-1 d.w.; FA/TL: 30.8–33.7%; 16:0/18:1: 0.34±0.11–0.45±0.13). These results likely reflect the less favourable conditions for F. virsoides development on artificial substrates relative to natural substrates. The physiological processes of the algae growing on artificial substrata were more impaired with increasing age (FA: 1.9±0.6 mg g-1d.w.; FA/TL: 18.2%; 16:0/18:1: 0.68±0.08).U proljeće tijekom maksimuma vegetacijskog razvoja smeđe alge Fucus virsoides istražen je učinak podloge (prirodna, vapnenac ili umjetna, beton) na sastav masnih kiselina u algi. Uzorkovano je na šest staništa, uključujući luke i plaže, duž istarske obale (sjeverni Jadran). Sva staništa su bila pod utjecajem vrlo sličnih okolišnih čimbenika, i izložena umjerenom antropogenom utjecaju. Za vrstu F. virsoides na umjetnoj podlozi karakteristična je niža koncentracija masnih kiselina (MK), njihov niži udio u ukupnim lipidima (UL), povišeni C16:0/18:1 omjeri (MK: 6.7±0.6 mg g -1 s.t.; MK/UL: 22%; 16:0/18:1: 0.57±0.08) te veća zasićenost u usporedbi sa zajednicama na prirodnoj podlozi (MK: 10.2±2.9–12.5±3.4 mg g-1s.t.; MK/UL: 30.8–33.7%; 16:0/18:1: 0.34±0.11–0.45±0.13). Dobiveni rezultati odražavaju nepovoljne uvjete za rast i razvoj vrste F. virsoidesna umjetnoj podlozi u odnosu na prirodnu. Na umjetnoj podlozi je utvrđeno lošije fiziološko stanje u starijim primjercima alge (MK: 1.9±0.6 mg g-1 s.t.; MK/UL: 18.2%; 16:0/18:1: 0.68±0.08)

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