title: Comparison of fatty acid contents and composition in major lipid classes of larvae and adults of mosquitoes (Diptera: Culicidae) from a steppe region.
abstract: Emerging aquatic insects, including mosquitoes, are known to transfer to terrestrial ecosystems specific essential biochemicals, such as polyunsaturated fatty acids (PUFA). We studied fatty acid (FA) composition and contents of dominant mosquito populations (Diptera: Culicidae), that is, Anopheles messeae, Ochlerotatus caspius, Oc. flavescens, Oc. euedes, Oc. subdiversus, Oc. cataphylla, and Aedes cinereus, inhabited a steppe wetland of a temperate climate zone to fill up the gap in their lipid knowledge. The polar lipid and triacylglycerol fractions of larvae and adults were compared. In most studied mosquito species, we first found and identified a number of short-chain PUFA, for example, prominent 14:2n-6 and 14:3n-3, which were not earlier documented in living organisms. These PUFA, although occurred in low levels in adult mosquitoes, can be potentially used as markers of mosquito biomass in terrestrial food webs. We hypothesize that these acids might be synthesized (or retroconverted) by the mosquitoes. Using FA trophic markers accumulated in triacylglycerols, trophic relations of the mosquitoes were accessed. The larval diet comprised green algae, cryptophytes, and dinoflagellates and provided the mosquitoes with essential n-3 PUFA, linolenic, and eicosapentaenoic acids. As a result, both larvae and adults of the studied mosquitoes had comparatively high content of the essential PUFA. Comparison of FA proportions in polar lipids versus storage lipids shown that during mosquito metamorphosis transfer of essential eicosapentaenoic and arachidonic acids from the reserve in storage lipids of larvae to functional polar lipids in adults occurred.
authors: Institute of Biophysics of Siberian Branch of Russian Academy of Sciences, Akademgorodok, 50/50, Krasnoyarsk, Russia; Institute of Fundamental Biology and Biotechnology, Siberian Federal University, Krasnoyarsk, Russia.
authors: Nadezhda N
authors: NN
authors: Sushchik
authors: Yuri A
authors: YA
authors: Yurchenko
authors: Michail I
authors: MI
authors: Gladyshev
authors: Olga E
authors: OE
authors: Belevich
authors: Galina S
authors: GS
authors: Kalachova
authors: Angelika A
authors: AA
authors: Kolmakova
mesh_terms: D000818:Animals; D009033:Culicidae / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D017753:Ecosystem; D005227:Fatty Acids / Q000737:chemistry / Q000145:classification / Q000378:metabolism*; D007814:Larva / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D015394:Molecular Structure
chemical_list: D005227:Fatty Acids
keywords: amphibiotic insects; essential fatty acids; metamorphosis; mosquitoes; short-chain polyunsaturated fatty acids