首页|Fatty acid flux disparities between aquatic and terrestrial ecosystems in a shaded river can alter the nutritional content of consumer resources
Fatty acid flux disparities between aquatic and terrestrial ecosystems in a shaded river can alter the nutritional content of consumer resources
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Springer Nature
Boreal forests are rich in small rivers, whose primary productivity is limited by tree shading. The diet of benthivorous fish in such rivers is based on a mixture of autochthonous and allochthonous organic matter. Algae produce and aquatic invertebrates accumulate polyunsaturated fatty acids (PUFA) of the n-3 family (n-3 PUFA), including eicosapentaenoic acid, a long-chain PUFA. Terrestrial organisms are poor in these essential nutrients but are rich in n-6 PUFA. Here, we aimed to assess fluxes of biomass and n-3 and n-6 PUFA between aquatic and terrestrial ecosystems of the shaded Krutaya Kacha River. The production of benthic macroinvertebrates in the river was 11.7 mg dry weight (DW) m~(-2) day~(-1), while the export of aquatic insect biomass was 4.28 mg (DW) m~(-2) day~(-1). The import of invertebrate biomass into the river was 56.2 mg (DW) m~(-2) day~(-1), which was 1 order of magnitude higher than the export of aquatic insects and 5 times higher than the production of benthic macroinvertebrates. The import of n-3 PUFA and n-6 PUFA into the river via invertebrates was 0.550 and 0.909 mg (DW) m~(-2) day~(-1), respectively, while the export of these fatty acid groups from the river with emergent insects was lower by factors of 6.7 and 20.7, respectively. Thus, in such rivers, stream consumers feeding on aquatic and terrestrial resources receive food of biochemically differing quality: the amounts of food being equal, fish consuming terrestrial invertebrates receive less n-3 PUFA but more n-6 PUFA than fish consuming aquatic invertebrates. The predominance of allochthonous food towards the base of stream food webs can have cascading effects, which result in lower nutritional quality at higher trophic levels, as previously observed in fish within the Krutaya Kacha River.
Olesia N. Makhutova、Yulia O. Mashonskaya、Elena V. Borisova、Nadezhda I. Kislitsina、Svetlana P. Shulepina
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National Scientific Center of Marine Biology, Far Eastern Branch of Russian Academy of Sciences, 690041 Vladivostok, Russia||Institute of Biophysics, Federal Research Center 'Krasnoyarsk Science Center', Siberian Branch of Russian Academy of Sciences, 660036 Krasnoyarsk, Russia
Siberian Federal University, 660041 Krasnoyarsk, Russia
NETL
NSTL
Springer Nature
