gesjGEOGRAPHY, ENVIRONMENT, SUSTAINABILITYGEOGRAPHY, ENVIRONMENT, SUSTAINABILITY2071-93882542-1565Russian Geographical Society10.24057/2071-9388-2019-103gesj-827Research ArticleSPECIAL ISSUEBiogeochemical specialization of macrophytes and their role as a biofilter in the Selenga deltaShinkarevaG. L.

Leninskie Gory, Moscow

galina.shinkareva@gmail.comLychaginM. Yu.

Leninskie Gory, Moscow

TarasovM. K.

Leninskie Gory, Moscow

PietrońJ.

Ullevigatan 19, Gothenburg, 411 40

ChichaevaM. A.

6 Miklukho-Maklaya St., Moscow

ChalovS. R.

Leninskie Gory, Moscow

Lomonosov Moscow State UniversityRussian FederationWSP Sverige ABSwedenPeoples Friendship University of Russia (RUDN University)Russian Federation201914102019123240263Copyright © Shinkareva G.L., Lychagin M.Y., Tarasov M.K., Pietroń J., Chichaeva M.A., Chalov S.R., 20192019Shinkareva G.L., Lychagin M.Y., Tarasov M.K., Pietroń J., Chichaeva M.A., Chalov S.R.Shinkareva G.L., Lychagin M.Y., Tarasov M.K., Pietroń J., Chichaeva M.A., Chalov S.R.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://ges.rgo.ru/jour/article/view/827

This study aims to evaluate the biofiltration ability of higher aquatic vegetation of the Selenga delta as a barrier for heavy metals and metalloids (HMM) flows into the Lake Baikal. Main aquatic vegetation species have been collected from deltaic channels and inner lakes: Nuphar pumila, Potamogeton perfoliatus, P. pectinatus, P. natans, P. friesii, Butomus umbellatus, Myriophyllum spicatum, Ceratophyllum demersum, Phragmites australis. Analysis of the obtained data showed that regardless of the place of growth hydatophytes spiked water-milfoil (M. spicatum) and the fennel-leaved pondweed (P. pectinatus) most actively accumulate metals. Opposite tendencies were found for helophytes reed (Ph. australis) and flowering rush (B. umbellatus), which concentrate the least amount of elements. This supports previous findings that the ability to concentrate HMM increases in the series of surface – floating – submerged plants. Regarding river water, the studied macrophyte species are enriched with Mn and Co, regarding suspended matter – Mo, Mn and B, regarding bottom sediments – Mn, Mo and As. We identified two associations of chemical elements: S-association with the predominant suspended form of migration (Be, V, Co, Ni, W, Pb, Bi, Mn, Fe and Al) and D-association with the predominant dissolved form of migration (B, U, Mo, Cr, Cu, Zn, As, Cd, Sn and Sb). Due to these associations three groups of macrophytes were distinguished – flowering rush and reed with a low HMM content; small yellow pond-lily and common floating pondweed with a moderate accumulation of S-association and weak accumulation of D-association elements; and clasping-leaved pondweed, fennel-leaved pondweed, and pondweed Friesii accumulating elements of both S and D groups. The results suggest that macrophytes retain more than 60% of the total Mn flux that came into the delta, more than 10% – W, As, and from 3 to 10% B, Fe, Co, Mo, Cd, V, Ni, Bi, Be, Cu, Zn, Cr, U, Al. The largest contribution is made by the group of hydatophytes (spiked water-milfoil and pondweed), which account for 74 to 96% of the total mass of substances accumulated by aquatic plants.

biogeochemistrydeltaic environmentheavy metals and metalloids in aquatic systemsmacrophyteshyperspectral imagesWork was done with financial support of following grants: “Comprehensive assessment of the impact of the Selenga basin on Lake Baikal” (RGS, No. 06/2015-И),“Development of the atlasmonograph “The Selenga Basin: hydrological and landscape-geochemical analysis” (RGS, 13/2016-P), Spatio-temporal analysis of the migration of chemical elements and compounds in natural and anthropogenic landscapes” (No. 14-27-00083), RGS-RFBR “Geochemical barrier zones in freshwater river deltas of Russia” (No. 23/2017 / RGSRFBR), RFBR “Long-term river variability the influx of water, sediment and chemicals into Lake Baikal” (No. 17-29-05027). In addition, the work was supported by WSP Sverige AB (project K3502010). 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The authors declare that there are no conflicts of interest present.