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Article

Selective Fatty Acid Retention and Turnover in the Freshwater Amphipod Pallaseopsis quadrispinosa

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Department of Biological and Environmental Science, University of Jyväskylä, P.O. Box 35 (YA), 40014 Jyväskylä, Finland
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Lammi Biological Station, University of Helsinki, Pääjärventie 320, 16900 Lammi, Finland
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Institute of Atmospheric and Earth System Research (INAR)/Forest Sciences, University of Helsinki, 00014 Helsinki, Finland
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Helsinki Institute of Sustainability Science (HELSUS), University of Helsinki, 00014 Helsinki, Finland
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WasserCluster Lunz—Biologische Station, Dr. Carl Kupelwieser Promenade 5, A-3293 Lunz am See, Austria
*
Authors to whom correspondence should be addressed.
Academic Editor: Michail I. Gladyshev
Biomolecules 2021, 11(3), 478; https://doi.org/10.3390/biom11030478
Received: 5 February 2021 / Revised: 12 March 2021 / Accepted: 14 March 2021 / Published: 23 March 2021
(This article belongs to the Special Issue Fatty Acids in Natural Ecosystems and Human Nutrition 2021)
Gammarid amphipods are a crucial link connecting primary producers with secondary consumers, but little is known about their nutritional ecology. Here we asked how starvation and subsequent feeding on different nutritional quality algae influences fatty acid retention, compound-specific isotopic carbon fractionation, and biosynthesis of ω-3 and ω-6 polyunsaturated fatty acids (PUFA) in the relict gammarid amphipod Pallaseopsis quadrispinosa. The fatty acid profiles of P. quadrispinosa closely matched with those of the dietary green algae after only seven days of refeeding, whereas fatty acid patterns of P. quadrispinosa were less consistent with those of the diatom diet. This was mainly due to P. quadrispinosa suffering energy limitation in the diatom treatment which initiated the metabolization of 16:1ω7 and partly 18:1ω9 for energy, but retained high levels of eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) similar to those found in wild-caught organisms. Moreover, α-linolenic acid (ALA) from green algae was mainly stored and not allocated to membranes at high levels nor biosynthesized to EPA. The arachidonic acid (ARA) content in membrane was much lower than EPA and P. quadrispinosa was able to biosynthesize long-chain ω-6 PUFA from linoleic acid (LA). Our experiment revealed that diet quality has a great impact on fatty acid biosynthesis, retention and turnover in this consumer. View Full-Text
Keywords: polyunsaturated fatty acids; nutritional ecology; freshwater; amphipod polyunsaturated fatty acids; nutritional ecology; freshwater; amphipod
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MDPI and ACS Style

Taipale, S.J.; Kers, E.; Peltomaa, E.; Loehr, J.; Kainz, M.J. Selective Fatty Acid Retention and Turnover in the Freshwater Amphipod Pallaseopsis quadrispinosa. Biomolecules 2021, 11, 478. https://doi.org/10.3390/biom11030478

AMA Style

Taipale SJ, Kers E, Peltomaa E, Loehr J, Kainz MJ. Selective Fatty Acid Retention and Turnover in the Freshwater Amphipod Pallaseopsis quadrispinosa. Biomolecules. 2021; 11(3):478. https://doi.org/10.3390/biom11030478

Chicago/Turabian Style

Taipale, Sami J., Erwin Kers, Elina Peltomaa, John Loehr, and Martin J. Kainz. 2021. "Selective Fatty Acid Retention and Turnover in the Freshwater Amphipod Pallaseopsis quadrispinosa" Biomolecules 11, no. 3: 478. https://doi.org/10.3390/biom11030478

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