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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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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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