Fatty Acid Composition and Content in Dominating Chironomid Species at Various Life Stages Dominating in a Saline Siberian Lake
O. N. MAKHUTOVA1,2, E. V. BORISOVA2, S. P. SHULEPINA2, A. A. KOLMAKOVA1, N. N. SUSHCHIK1,2
1Institute of Biophysics, SB RAS, 660036, Krasnoyarsk, Akademgorodok 50/50
2Siberian Federal University, 660041, Krasnoyarsk, Svobodny ave., 79
Keywords: жирные кислоты, Chironomidae, соленое озеро, стадии развития, вылет амфибионтных насекомых, fatty acids, Chironomidae, saline lake, life stages, amphibiotic insect emergence
Abstract
We studied fatty acid (FA) composition and content of essential polyunsaturated fatty acids in biomass of larvae and adults of Chironomidae species that dominated in benthos of saline Lake Shira: Glyptotendiрes barbiрes, Сhironomus nigrifrons and C. halophilus. Species of different genera significantly differed in their larvae FA composition and essential PUFA content; and they also occupied different ecological niches in the lake. Chironomus species with low PUFA content, 0.2-0.3 mg x g-1 of wet weight, inhabited a deepwater zone, while G. barbiрes that was rich in PUFA, 2.3 mg x g-1 of wet weight, dwelt in littoral of the lake. The biochemical differences were likely related with feeding sources of these taxa and may also be explained by the phylogenetic factor. We did not find differences in the PUFA content of larvae and adults of the same species, G. barbiрes. This finding contrasted with previous data that were based on multispecies samples and showed a substantial increase of PUFA content in adult biomass due to the metamorphosis. Thus, data on biochemical content of larvae can potentially be used in calculations of PUFA fluxes from water to land through chironomid emergence from water bodies. However, taxonomic affiliation of the emerged chironomids should be considered due to high variability in PUFA content in Chironomidae species.
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