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Effects of water column processes on the use of sediment traps to measure zooplankton non-predatory mortality: a mathematical and empirical assessment / O. P. Dubovskaya [et al.] // J. Plankton Res. - 2018. - Vol. 40, Is. 1. - P91-106, DOI 10.1093/plankt/fbx066. - Cited References:49. - This work was a part of the joint German-Russian Project "Mortality of Zooplankton in lake ecosystems and its potential contribution to carbon mineralization in pelagic zone" supported by the German Research Foundation (DFG no. GR-1540/29-1) and the Russian Foundation for Basic Research (RFBR no. 16-54-12048). The work also was partly supported by Russian Federal Tasks of Fundamental Research (project no. 51.1.1) and by grant (no. 9249.2016.5) from the RF President Council on Grants for leading RF scientific schools. . - ISSN 0142-7873. - ISSN 1464-3774

РУБ Marine & Freshwater Biology + Oceanography
Рубрики:
NONCONSUMPTIVE MORTALITY
CRUSTACEAN ZOOPLANKTON
VERTICAL-DISTRIBUTION
Кл.слова (ненормированные):
zooplankton -- Arctodiaptomus salinus -- non-predatory mortality -- sediment -- trap -- carcasses -- stratified lake
Аннотация: Zooplankton populations can at times suffer mass mortality due to non-predatory mortality (NPM) factors, and the resulting carcasses can be captured by sediment traps to estimate NPM rate. This approach assumes sinking to be the primary process in removing carcasses, but in reality, carcasses can also be removed by ingestion, turbulent mixing and microbial degradation in the water column. We present mathematical formulations to calculate NPM from sediment trap data by accounting for carcass removal by processes in addition to sinking, and demonstrate their application in a study in Lake Shira, Russia. Carcass abundance of the major calanoid copepod Arctodiaptomus salinus decreased with depth, indicating the effect of carcass removal from the water column. The estimated NPM values (0.0003-0.103 d(-1)) were comparable with previously reported physiological death rates. We further used independent data to partition carcass removal due to detritivory, turbulent mixing and microbial degradation. Estimated ingestion by the amphipod Gammarus lacustris could account for the disappearance of copepod carcasses above the traps. Wind-driven turbulence could also extend the carcass exposure time to microbial degradation. Collectively, these water column processes would facilitate the remineralization of carcasses in the water column, and diminish the carcass carbon flux to the benthos.

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Держатели документа:
Russian Acad Sci, Siberian Branch, Krasnoyarsk Sci Ctr, Inst Biophys,Fed Res Ctr,Dept Expt Hydroecol, 50-50 Akademgorodok, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Inst Fundamental Biol & Biotechnol, 79 Svobodny Ave, Krasnoyarsk 660041, Russia.
Leibniz Inst Freshwater Ecol & Inland Fisherie, Dept Ecohydrol, Muggelseedamm 310, D-12587 Berlin, Germany.
Natl Acad Sci Belarus Bioresources, Pract Ctr, Dept Hydrobiol, 27 Acad Skaya St, Minsk 220072, Byelarus.
Swansea Univ, Dept Biosci, Singleton Pk, Swansea SA2 8PP, W Glam, Wales.

Доп.точки доступа:
Dubovskaya, Olga P.; Tolomeev, Aleksandr P.; Kirillin, Georgiy; Buseva, Zhanna; Tang, Kam W.; Gladyshev, Michail I.; German Research Foundation (DFG) [GR-1540/29-1]; Russian Foundation for Basic Research (RFBR) [16-54-12048]; Russian Federal Tasks of Fundamental Research [51.1.1]; RF President Council on Grants for leading RF scientific schools [9249.2016.5]

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Effects of zooplankton carcasses degradation on freshwater bacterial community composition and implications for carbon cycling / O. V. Kolmakova [et al.] // Environ. Microbiol. - 2018, DOI 10.1111/1462-2920.14418 . - Article in press. - ISSN 1462-2912
Аннотация: Non-predatory mortality of zooplankton provides an abundant, yet, little studied source of high quality labile organic matter (LOM) in aquatic ecosystems. Using laboratory microcosms, we followed the decomposition of organic carbon of fresh 13C-labelled Daphnia carcasses by natural bacterioplankton. The experimental setup comprised blank microcosms, that is, artificial lake water without any organic matter additions (B), and microcosms either amended with natural humic matter (H), fresh Daphnia carcasses (D) or both, that is, humic matter and Daphnia carcasses (HD). Most of the carcass carbon was consumed and respired by the bacterial community within 15 days of incubation. A shift in the bacterial community composition shaped by labile carcass carbon and by humic matter was observed. Nevertheless, we did not observe a quantitative change in humic matter degradation by heterotrophic bacteria in the presence of LOM derived from carcasses. However, carcasses were the main factor driving the bacterial community composition suggesting that the presence of large quantities of dead zooplankton might affect the carbon cycling in aquatic ecosystems. Our results imply that organic matter derived from zooplankton carcasses is efficiently remineralized by a highly specific bacterial community, but does not interfere with the bacterial turnover of more refractory humic matter. © 2018 Society for Applied Microbiology and John Wiley & Sons Ltd.

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Держатели документа:
Institute of Biophysics SB RAS, Federal Research Center “Krasnoyarsk Science Center SB RAS”, Krasnoyarsk, Russian Federation
Siberian Federal University, Institute of Fundamental Biology and Biotechnology, Krasnoyarsk, Russian Federation
Department of Experimental Limnology, Leibniz-Institute of Freshwater Ecology and Inland Fisheries (IGB), Berlin, Germany
GFZ German Research Centre for Geosciencess, Section 5.3 Geomicrobiology, Potsdam, Germany
Experimental Phycology and Culture Collection of Algae (SAG), University of Gottingen, Gottingen, Germany
Institute of Biochemistry and Biology, University of Potsdam, Potsdam, Germany

Доп.точки доступа:
Kolmakova, O. V.; Gladyshev, M. I.; Fonvielle, J. A.; Ganzert, L.; Hornick, T.; Grossart, H. -P.

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Estimating In Situ Zooplankton Non-Predation Mortality in an Oligo-Mesotrophic Lake from Sediment Trap Data: Caveats and Reality Check [Text] / O. P. Dubovskaya [et al.] // PLoS One. - 2015. - Vol. 10, Is. 7. - Ст. e0131431, DOI 10.1371/journal.pone.0131431. - Cited References:60. - This work was supported by joint projects of Russian Foundation for Basic Research and Belarusian Republican Foundation for Fundamental Research (No 14-05-90005-Bel-a to O.P.D and A.P.T., and No B14R-066 to Zh.B.). K.W.T. was supported by a Humboldt Fellowship for Experienced Researchers (Germany), M.I.G. was supported by Russian Federal Tasks of Fundamental Research (project No. 51.1.1), H.P.G. and G.K. were supported by grants from the German Science Foundation (GR 1540/20-1 and KI-853/8-1). . - ISSN 1932-6203

РУБ Multidisciplinary Sciences
Рубрики:
FRESH-WATER
NONCONSUMPTIVE MORTALITY
NONPREDATORY MORTALITY
Аннотация: Background Mortality is a main driver in zooplankton population biology but it is poorly constrained in models that describe zooplankton population dynamics, food web interactions and nutrient dynamics. Mortality due to non-predation factors is often ignored even though anecdotal evidence of non-predation mass mortality of zooplankton has been reported repeatedly. One way to estimate non-predation mortality rate is to measure the removal rate of carcasses, for which sinking is the primary removal mechanism especially in quiescent shallow water bodies. Objectives and Results We used sediment traps to quantify in situ carcass sinking velocity and non-predation mortality rate on eight consecutive days in 2013 for the cladoceran Bosmina longirostris in the oligo-mesotrophic Lake Stechlin; the outcomes were compared against estimates derived from in vitro carcass sinking velocity measurements and an empirical model correcting in vitro sinking velocity for turbulence resuspension and microbial decomposition of carcasses. Our results show that the latter two approaches produced unrealistically high mortality rates of 0.58-1.04 d(-1), whereas the sediment trap approach, when used properly, yielded a mortality rate estimate of 0.015 d(-1), which is more consistent with concurrent population abundance data and comparable to physiological death rate from the literature. Ecological implications Zooplankton carcasses may be exposed to water column microbes for days before entering the benthos; therefore, non-predation mortality affects not only zooplankton population dynamics but also microbial and benthic food webs. This would be particularly important for carbon and nitrogen cycles in systems where recurring mid-summer decline of zooplankton population due to non-predation mortality is observed.

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Держатели документа:
Russian Acad Sci, Siberian Branch, Inst Biophys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Swansea Univ, Dept Biosci, Swansea SA2 8PP, W Glam, Wales.
Swansea Univ, Ctr Sustainable Aquat Res, Swansea SA2 8PP, W Glam, Wales.
MU, Leibniz Inst Freshwater Ecol & Inland Fisheries, Dept Ecohydrol, D-12587 Berlin, Germany.
Natl Acad Sci Belarus Bioresources, Sci & Pract Ctr, Minsk 220072, Byelarus.
Leibniz Inst Freshwater Ecol & Inland Fisheries, Dept Expt Limnol, D-16775 Neuglobsow, Germany.
Univ Potsdam, Inst Biochem & Biol, D-14469 Potsdam, Germany.

Доп.точки доступа:
Dubovskaya, Olga P.; Tang, Kam W.; Gladyshev, Michail I.; Kirillin, Georgiy; Buseva, Zhanna; Kasprzak, Peter; Tolomeev, Aleksandr P.; Grossart, Hans-Peter; Russian Foundation for Basic Research; Belarusian Republican Foundation for Fundamental Research [14-05-90005-Bel-a, B14R-066]; Humboldt Fellowship for Experienced Researchers (Germany); Russian Federal Tasks of Fundamental Research [51.1.1]; German Science Foundation [GR 1540/20-1, KI-853/8-1]

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Numerical Modeling of Vertical Distribution of Living and Dead Copepods Arctodiaptomus salinus in Salt Lake Shira / A. P. Tolomeev [et al.] // Contemp. Probl. Ecol. - 2018. - Vol. 11, Is. 6. - P543-550, DOI 10.1134/S1995425518060112. - Cited References:25. - This work is part of the joint Russian-German project "Zooplankton Mortality in Lake Ecosystems and Its Potential Contribution to Carbon Mineralization In Pelagial," supported by the Russian Foundation for Basic Research, project no. 16-54-12048 and the German Research Foundation (DFG no. GR-1540/29-1), and partly supported by the Government Task in the framework of the Program of Basic Research of the Russian Federation (theme no. 51.1.1) . - ISSN 1995-4255. - ISSN 1995-4263

РУБ Ecology
Рубрики:
NONPREDATORY MORTALITY
CRUSTACEAN ZOOPLANKTON
SEDIMENT TRAPS
Кл.слова (ненормированные):
zooplankton -- nonpredatory mortality -- numerical modeling -- Arctodiaptomus -- salinus
Аннотация: In deep stratified lakes, the processes of growth and mortality of zooplankton populations result in uneven vertical distributions of living and dead organisms in a water column. The carcasses in the water are removed by sinking, degradation due to microbial decomposition and detritivory, etc. In the case of the epilimnion maximum of zooplankton, provided that the degradation prevails over the sinking, the downward flux of carcasses exponentially decays with depth. This vertical profile of dead organisms, demonstrating the decline in meta- and hypoliminon, can be described by the numerical model presented in this paper. The model approximation of the field data makes it possible to determine non-predator mortality rate m and degradation rate D in relative terms (m/v and D/v, vsinking velocity) or absolute values (with defined v). For the case of the copepod population of Arctodiaptomus salinus in Lake Shira, the calculated m and D (medians of 0.13 and 0.26 day(-1), respectively) were in a good agreement with the literature data. This method also gives the advantage of using the depth-dependent sinking velocity v.

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Держатели документа:
Russian Acad Sci, Inst Biophys, Krasnoyarsk Sci Ctr, Siberian Branch, Krasnoyarsk 660036, Russia.
Leibniz Inst Freshwater Ecol & Inland Fisheries, Dept Ecohydrol, D-12587 Berlin, Germany.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Natl Acad Sci Belarus Bioresources, Sci & Pract Ctr, Minsk 220072, BELARUS.

Доп.точки доступа:
Tolomeev, A. P.; Kirillin, G.; Dubovskay, O. P.; Buseva, Z. F.; Gladyshev, M. I.; Russian Foundation for Basic Research [16-54-12048]; German Research Foundation (DFG) [GR-1540/29-1]; Russian Federation [51.1.1]

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Zooplankton carcasses and non-predatory mortality in freshwater and inland sea environments [Text] / K. W. Tang [et al.] // J. Plankton Res. - 2014. - Vol. 36, Is. 3. - P597-612, DOI 10.1093/plankt/fbu014. - Cited References: 168. - This work was supported by the Humboldt Foundation (Fellowship for Experienced Researchers to K. W. T.); Siberian Branch of Russian Academy of Science (Partner Project No. 8 to M. I. G. and O.P.D.); Federal Tasks of Ministry of Education and Science of Russian Federation (project B-15 of Siberian Federal University to M. I. G.); the Leibniz-Association (SAW-2011-IGB-2 to G. K.); and the German Science foundation (KI-853/7-1 to G. K., GR1540/20-1 to H. P. G.). The manuscript benefited from the constructive comments from three reviewers. . - ISSN 0142-7873. - ISSN 1464-3774

РУБ Marine & Freshwater Biology + Oceanography
Рубрики:
SMALL-SCALE TURBULENCE
   NON-CALANOID COPEPODS
   AGGREGATES LAKE SNOW
   DAPHNIA-GALEATA
   MIDSUMMER DECLINE
   NONCONSUMPTIVE MORTALITY
   CRUSTACEAN ZOOPLANKTON
   CLIMATE-CHANGE
   VERTICAL-DISTRIBUTION
   POPULATION-GROWTH
Кл.слова (ненормированные):
carbon flux -- inland waters -- lakes -- live -- dead sorting -- non-predatory mortality -- zooplankton carcasses
Аннотация: Zooplankton carcasses are ubiquitous in marine and freshwater systems, implicating the importance of non-predatory mortality, but both are often overlooked in ecological studies compared with predatory mortality. The development of several microscopic methods allows the distinction between live and dead zooplankton in field samples, and the reported percentages of dead zooplankton average 11.6 (minimum) to 59.8 (maximum) in marine environments, and 7.4 (minimum) to 47.6 (maximum) in fresh and inland waters. Common causes of non-predatory mortality among zooplankton include senescence, temperature change, physical and chemical stresses, parasitism and food-related factors. Carcasses resulting from non-predatory mortality may undergo decomposition leading to an increase in microbial production and a shift in microbial composition in the water column. Alternatively, sinking carcasses may contribute significantly to vertical carbon flux especially outside the phytoplankton growth seasons, and become a food source for the benthos. Global climate change is already altering freshwater ecosystems on multiple levels, and likely will have significant positive or negative effects on zooplankton non-predatory mortality. Better spatial and temporal studies of zooplankton carcasses and non-predatory mortality rates will improve our understanding of this important but under-appreciated topic.

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Держатели документа:
[Tang, Kam W.] Virginia Inst Marine Sci, Coll William & Mary, Gloucester Point, VA 23062 USA
[Tang, Kam W.] Swansea Univ, Dept Biosci, Swansea SA2 8PP, W Glam, Wales
[Gladyshev, Michail I.
Dubovskaya, Olgo P.] Russian Acad Sci, Inst Biophys, Siberian Branch, Krasnoyarsk 660036, Russia
[Gladyshev, Michail I.
Dubovskaya, Olgo P.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Kirillin, Georgiy] Leibniz Inst Freshwater Ecol & Inland Fisheries, Dept Ecohydrol, D-12587 Berlin, Germany
[Grossart, Hans-Peter] Leibniz Inst Freshwater Ecol & Inland Fisheries, Dept Expt Limmol, D-16775 Stechlin, Germany
[Grossart, Hans-Peter] Univ Potsdam, Inst Biochem & Biol, D-14469 Potsdam, Germany
ИБФ СО РАН : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Tang, K.W.; Gladyshev, M.I.; Dubovskaya, O.P.; Kirillin, G...; Grossart, H.P.; Humboldt Foundation; Ministry of Education and Science of Russian Federation (Siberian Federal University) [B-15]; Leibniz-Association [SAW-2011-IGB-2]; German Science foundation [KI-853/7-1, GR1540/20-1]

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Zooplankton carcasses stimulate microbial turnover of allochthonous particulate organic matter / D. Neubauer, O. Kolmakova, J. Woodhouse [et al.] // ISME J. - 2021, DOI 10.1038/s41396-020-00883-w. - Cited References:83. - Open Access funding enabled and organized by Projekt DEAL. . - Article in press. - ISSN 1751-7362. - ISSN 1751-7370

РУБ Ecology + Microbiology
Рубрики:
FRESH-WATER
   SEASONAL-CHANGES
   CARBON
   LAKE
   DECOMPOSITION
   DEGRADATION
Аннотация: Carbon turnover in aquatic environments is dependent on biochemical properties of organic matter (OM) and its degradability by the surrounding microbial community. Non-additive interactive effects represent a mechanism where the degradation of biochemically persistent OM is stimulated by the provision of bioavailable OM to the degrading microbial community. Whilst this is well established in terrestrial systems, whether it occurs in aquatic ecosystems remains subject to debate. We hypothesised that OM from zooplankton carcasses can stimulate the degradation of biochemically persistent leaf material, and that this effect is influenced by the daphnia:leaf OM ratio and the complexity of the degrading microbial community. Fresh Daphnia magna carcasses and C-13-labelled maize leaves (Zea mays) were incubated at different ratios (1:1, 1:3 and 1:5) alongside either a complex microbial community (50 mu m) or solely bacteria (0.8 mu m). C-13 stable-isotope measurements of CO2 analyses were combined with phospholipid fatty acids (PLFA) analysis and DNA sequencing to link metabolic activities, biomass and taxonomic composition of the microbial community. Our experiments indicated a significantly higher respiration of leaf-derived C when daphnia-derived OM was most abundant (i.e. daphnia:leaf OM ratio of 1:1). This process was stronger in a complex microbial community, including eukaryotic microorganisms, than a solely bacterial community. We concluded that non-additive interactive effects were a function of increased C-N chemodiversity and microbial complexity, with the highest net respiration to be expected when chemodiversity is high and the degrading community complex. This study indicates that identifying the interactions and processes of OM degradation is one important key for a deeper understanding of aquatic and thus global carbon cycle.

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Держатели документа:
Leibniz Inst Freshwater Ecol & Inland Fisheries I, Dept Expt Limnol, D-16775 Stechlin, Germany.
Potsdam Univ, Inst Biochem & Biol, D-14476 Potsdam, Germany.
RAS, Inst Biophys SB, Fed Res Ctr, Krasnoyarsk Sci Ctr, Krasnoyarsk, Russia.
Siberian Fed Univ, Inst Fundamental Biol & Biotechnol, Krasnoyarsk, Russia.
Helmholtz Ctr Potsdam, Sect Organ Geochem 32, GFZ German Res Ctr Geosci, D-14473 Potsdam, Germany.
Leibniz Inst Freshwater Ecol & Inland Fisheries I, Dept Chem Analyt & Biogeochem, Muggelseedamm 310, D-12587 Berlin, Germany.

Доп.точки доступа:
Neubauer, Darshan; Kolmakova, Olesya; Woodhouse, Jason; Taube, Robert; Mangelsdorf, Kai; Gladyshev, Michail; Premke, Katrin; Grossart, Hans-Peter; Projekt DEAL

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