Phospholipid characteristics and neutral lipid fatty acid composition related to temperature and nutritional conditions in ecologically important amphipod species from the northern Baltic Sea

Eila O. Lahdes, Tibor Farkas, Kari K. Lehtonen

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Lipid composition of the benthic, stenothermalamphipodMonoporeia affinis collected fromconstantly cold deepwater (>80 m) regions of the northern Baltic Sea was analysed in detail to study phospholipid characteristics, its relation to thermal adaptation as well as potential effects of food quality and seasonal variability. Similar measurements were performed on the littoral, eurythermic amphipod Gammarus spp. Fatty acid (FA) composition of storage lipids of Pontoporeia femorata, a sibling species of M. affinis, was also studied. Interannual and interspecies variability in selected FA was observed both in triacylglycerols (TAG) and phospholipids (PL). Differences in monounsaturated vs. polyunsaturated (MUFA/PUFA) FA combinations of phosphatidyl ethanolamine (PE) diacyl and alkylacyl subgroups were also observed. Seasonal variability in M. affinis was considerably lesser compared to Gammarus spp. A literature synopsis shows that in diacyl PE the share of the FA combination MUFA/PUFA increases with lowering body temperature (40-55% in cold-adapted organisms vs. 5-15% inwarmadapted ones), signifying that this characteristic is probably in key position concerning regulation of membrane fluidity in temperature adaptation. According to this feature M. affinis belongs to the group of coldadapted stenothermic species (Group 1) while eurythermic Gammarus spp. settles in the Group 2 (coldacclimatized) or 3 (warm-acclimatized/tropical) depending on the status of temperature adaptation. Omnivory and/or periodical food item switching is an important strategy in benthic organisms in high-latitude areas characterised by recurring long poor-nutritional periods. Since many benthic species utilise a time-averaged, integrated food source from phytal and animal matter from various sources the FA composition of TAG of the amphipod species measured here do not exclusively point towards any specific feeding mode or food source. In general, using selected FA as food source markers to assess the diet of field collected more-or-less omnivoric species cannot be considered as an optimal approach. The current study givesmore insight to the biochemistry of biological membranes of aquatic crustaceans that is essential in estimation of the capacity of the thermal adaptation/acclimatization of organisms as well as the potential effects of food quality on storage lipids.

Original languageEnglish
Pages (from-to)125-133
Number of pages9
JournalJournal of Experimental Marine Biology and Ecology
Volume390
Issue number2
DOIs
Publication statusPublished - 2010

Keywords

  • Amphipods
  • Biological membranes
  • Fatty acids
  • Phospholipids
  • Thermal adaptation

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Aquatic Science

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