@article{TangFluryGrossartetal.2017,
  author    = {Tang, Kam W. and Flury, Sabine and Grossart, Hans-Peter and McGinnis, Daniel F.},
  title     = {The Chaoborus pump: Migrating phantom midge larvae sustain hypolimnetic oxygen deficiency and nutrient internal loading in lakes},
  series = {Water research},
  volume    = {122},
  journal   = {Water research},
  publisher = {Elsevier},
  address   = {Oxford},
  issn      = {0043-1354},
  doi       = {10.1016/j.watres.2017.05.058},
  pages     = {36 -- 41},
  year      = {2017},
  abstract  = {Hypolimnetic oxygen demand in lakes is often assumed to be driven mainly by sediment microbial processes, while the role of Chaoborus larvae, which are prevalent in eutrophic lakes with hypoxic to anoxic bottoms, has been overlooked. We experimentally measured the respiration rates of C flavicans at different temperatures yielding a Q(10) of 1.44-1.71 and a respiratory quotient of 0.84-0.98. Applying the experimental data in a system analytical approach, we showed that migrating Chaoborus larvae can significantly add to the water column and sediment oxygen demand, and contribute to the observed linear relationship between water column respiration and depth. The estimated phosphorus excretion by Chaoborus in sediment is comparable in magnitude to the required phosphorus loading for eutrophication. Migrating Chaoborus larvae thereby essentially trap nutrients between the water column and the sediment, and this continuous internal loading of nutrients would delay lake remediation even when external inputs are stopped. (C) 2017 Elsevier Ltd. All rights reserved.},
  language  = {en}
}
@article{TangMcGinnisFrindteetal.2014,
  author    = {Tang, Kam W. and McGinnis, Daniel F. and Frindte, Katharina and Bruchert, Volker and Grossart, Hans-Peter},
  title     = {Paradox reconsidered: Methane oversaturation in well-oxygenated lake waters},
  series = {Limnology and oceanography},
  volume    = {59},
  journal   = {Limnology and oceanography},
  number    = {1},
  publisher = {Wiley},
  address   = {Waco},
  issn      = {0024-3590},
  doi       = {10.4319/lo.2014.59.1.0275},
  pages     = {275 -- 284},
  year      = {2014},
  abstract  = {The widely reported paradox of methane oversaturation in oxygenated water challenges the prevailing paradigm that microbial methanogenesis only occurs under anoxic conditions. Using a combination of field sampling, incubation experiments, and modeling, we show that the recurring mid-water methane peak in Lake Stechlin, northeast Germany, was not dependent on methane input from the littoral zone or bottom sediment or on the presence of known micro-anoxic zones. The methane peak repeatedly overlapped with oxygen oversaturation in the seasonal thermocline. Incubation experiments and isotope analysis indicated active methane production, which was likely linked to photosynthesis and/or nitrogen fixation within the oxygenated water, whereas lessening of methane oxidation by light allowed accumulation of methane in the oxygen-rich upper layer. Estimated methane efflux from the surface water was up to 5 mmol m(-2) d(-1). Mid-water methane oversaturation was also observed in nine other lakes that collectively showed a strongly negative gradient of methane concentration within 0-20\% dissolved oxygen (DO) in the bottom water, and a positive gradient within >= 20\% DO in the upper water column. Further investigation into the responsible organisms and biochemical pathways will help improve our understanding of the global methane cycle.},
  language  = {en}
}
@article{TolomeevDubovskayaKirillinetal.2022,
  author    = {Tolomeev, Aleksandr P. and Dubovskaya, Olga P. and Kirillin, Georgiy and Buseva, Zhanna and Kolmakova, Olesya and Grossart, Hans-Peter and Tang, Kam W. and Gladyšev, Michail I.},
  title     = {Degradation of dead cladoceran zooplankton and their contribution to organic carbon cycling in stratified lakes},
  series = {Journal of plankton research},
  volume    = {44},
  journal   = {Journal of plankton research},
  number    = {3},
  publisher = {Oxford Univ. Press},
  address   = {Oxford},
  issn      = {0142-7873},
  doi       = {10.1093/plankt/fbac023},
  pages     = {386 -- 400},
  year      = {2022},
  abstract  = {The contribution of dead zooplankton biomass to carbon cycle in aquatic ecosystems is practically unknown. Using abundance data of zooplankton in water column and dead zooplankton in sediment traps in Lake Stechlin, an ecological-mathematical model was developed to simulate the abundance and sinking of zooplankton carcasses and predict the related release of labile organic matter (LOM) into the water column. We found species-specific differences in mortality rate of the dominant zooplankton: Daphnia cucullata, Bosmina coregoni and Diaphanosoma brachyurum (0.008, 0.129 and 0.020 day(-1), respectively) and differences in their carcass sinking velocities in metalimnion (and hypolimnion): 2.1 (7.64), 14.0 (19.5) and 1.1 (5.9) m day(-1), respectively. Our model simulating formation and degradation processes of dead zooplankton predicted a bimodal distribution of the released LOM: epilimnic and metalimnic peaks of comparable intensity, ca. 1 mg DW m(-3) day(-1). Maximum degradation of carcasses up to ca. 1.7 mg DW m(-3) day(-1) occurred in the density gradient zone of metalimnion. LOM released from zooplankton carcasses into the surrounding water may stimulate microbial activity and facilitate microbial degradation of more refractory organic matter; therefore, dead zooplankton are expected to be an integral part of water column carbon source/sink dynamics in stratified lakes.},
  language  = {en}
}