Numerical Modeling of Vertical Distribution of Live and Dead Copepods Arctodiaptomus salinus in Salt Lake Shira
A. P. TOLOMEEV1, G. KIRILLIN2, O. P. DUBOVSKAYA1,3, Z. F. BUSEVA4, M. I. GLADYSHEV1,3
1Institute of Biophysics, 660036, Krasnoyarsk, Akademgorodok, 50/50
2Department of Ecohydrology, Leibniz-institute of Freshwater Ecology and Inland Fisheries, 12587, Berlin, Muggelseedamm, 310
3Siberian Federal University, 660041, Krasnoyarsk, Svobodny ave., 79
4Practical center of the National academy of science of Belarus for bioresources, 220072, Minsk, Akademicheskaya str., 27
Keywords: зоопланктон, не связанная с хищниками смертность, численное моделирование, вертикальное распределение, Arctodiaptomus salinus, zooplankton, non-predatory mortality, numerical modeling
Abstract
In deep stratified lakes the processes of growth and death rates of zooplankton populations result in uneven vertical distributions of live and dead organisms in a water column. The carcasses in the water are removed by process of sinking, and degradation due to microbial decomposition and detritivory and etc. In case of epilimnion maximum of zooplankton and when the degradation prevails over the sinking the downward flux of carcasses exponentially decays with depth. The vertical profile of dead organisms, demonstrating the decline in meta- and hypoliminon, can be fitted with the curve of numerical model, presented in this paper. The model approximation of the field data allow to determine non-predator mortality rate m and degradation rate D in relative terms ( m / v and D / v , v - sinking velocity) or absolute values (with defined v ). For the case of 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. The presented method also gives the advantage of using the depth depended sinking velocity v .
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