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A model study of the effect of weather forcing on the ecology of a meromictic Siberian lake

Journal of Oceanology and Limnology 2018年第6期36卷 2018-2032页

作者： igor g.prokopkin Egor S.ZADEREEV Institute of Biophysics SB RAS Krasnoyarsk Scientific Center660036AkademgorodokKrasnoyarskRussia Siberian Federal University 660079Svobodniiav.79KrasnoyarskRussia

We used a Lake Shira numerical model to estimate the response of the ecosystem of a saline meromictic lake to variations in weather parameters during the growing season. The sensitivity analysis of the model suggests that compared to other external(nutrient inflows) and internal(spring biomasses of food-web components) factors, weather parameters are among the most influential for both mixolimnetic(phyto-and zooplankton) and monimolimnetic(purple sulfur bacteria, sulfur reducing bacteria and hydrogen sulfide) food-web components. Calculations with different weather scenarios shows how changes in the water temperature and mixing depth af fect mixolimnetic and monimolimnetic food-web components and the depth of the oxic-anoxic interface in a meromictic lake. When weather forcing stimulates an increase in the biomass of food-web components in the mixolimnion, it produces cascading effects that lead to three results: 1) a higher content of detritus in the water column; 2) a higher content of hydrogen sulfide in the monimolimnion; 3) raising of the oxic-anoxic interface closer to the water-air surface. This cascading effect is complicated by the negative correlation between two light dependent primary producers located at diff erent depths—phytoplankton in the mixolimnion and purple sulfur bacteria at the oxic-anoxic interface. Thus, weather conditions that stimulate higher phytoplankton biomass are associated with a higher detritus content and lower biomass of purple sulfur bacteria, a higher content of hydrogen sulfide and a shallower oxic-anoxic interface. The same weather conditions(higher wind, lower cloud cover, and lower air temperature) promote a scenario of less stable thermal stratification. Thus, our calculations suggest that weather parameters during the summer season strongly control the mixing depth, water temperature and the mixolimnetic food web. An effect of biogeochemical and physical interactions on the depth of the oxicanoxic interface is also detecta

关键词： meromictic lake numerical model weather forcing sensitivity analysis stratifi cation food web

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Cryptophyta Flagellates of Meromictic Lakes Shira and Shunet(Khakassia,Russia):Mechanisms of Vertical Distribution and Trophic Role

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Acta geologica Sinica(English Edition) 2014年第S1期88卷 50-52页

作者： Yuri BARKHATOV Elena KHROMECHEK Alexander TOLOMEEV igor prokopkin Institute of Biophysics SB RAS Akademgorodok

1 Introduction Many of the stratified lakes are characterized by the presence of large populations of cryptomonads in their chemocline zones(Reynolds,1992;gervais et al,2003;Pedro’s-Alio’et al.,1995).These populations are adapted to low light intensity and high sulfide concentration;they have a mixotrophic ability and form the so-called"deep chlorophyll maxima"(gervais,1998;Marsha"and Laybourn-Parry,2002).A similar Cryptomonas sp.

关键词： phytoflagellates deep chlorophyll maxima meromictic lake simulation modelling Lake Shira Lake Shunet

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