HR: 0800h
AN: B31A-0974    [Abstracts]
TI: Influence of the Anthropogenic Load on Microplankton of a Mesotrophic Reservoir
AU: * Golovko, T V
EM: mommy@i.com.ua
AF: Institute of Hydrobiology, 12 Geroev Stalingrada , Kiev, 04212 Ukraine
AU: Popova, A F
EM: cell@svitonline.com
AF: Institute of Botany, 2 Tereshenkovckaya, Kiev, 01601 Ukraine
AU: Michjliuk, T I
EM: cell@svitonline.com
AF: Institute of Botany, 2 Tereshenkovckaya, Kiev, 01601 Ukraine
AU: Jurishinec, V
EM: mommy@i.com.ua
AF: Institute of Hydrobiology, 12 Geroev Stalingrada , Kiev, 04212 Ukraine
AU: Kemp, R
EM: rbk@aber.ac.uk
AF: Institute of Biological Sciences, University of Wales, Liwyd Building, Aberystwyth, SU23 3DA United Kingdom
AB: Investigation of how plankton associations form under the influence of anthropogenic factors is very important not only for the theoretical knowledge but also for the choosing criteria for ecosystem evaluation. The present study was in the scope of and sponsored by INTAS project 03-51-6196 to accumulate integral parameters of autothrophic and heterothrophic components of the microplankton for subsequent verification of NR index as an alternative evaluator of water environment. The annual dynamics of structural and some functional indicators of phyto-, bactrio, and microzooplankton (below 200 um) has been evaluated at two stations of Kanev reservoir (Dnepr river) that differed by the pollution level. Station 1 is located in green zone; it is relatively clean and considered as control. Station 2 experiences significant anthropogenic load from city of Kiev's industrial and household sewage. The phytoplankton consisted of 135 algae from the following divisions: Cyanophyta - 14, Euglenophyta - 8, Chlorophyta - 56, Bacillariophyta - 40, Dinophyta -6, Cryptophyta - 5, Crysophyta - 5, Xanthophyta - 1. The specific composition phytoplankton at the investigated sites was similar during the summer. The most significant differences between the stations were the quantity (N), biomass (B) square surface (S) and seasonal dynamics of the algae. The maximum values of these indices at the site 1 occurred in the beginning and mid-summer due to Diatoms and were N=4.5x10⁶cells/dm³, B=2.33 mg/dm³, S=1.4x10⁹ um²/dm³. The phytoplankton of the station 2 was characterized by higher values of all indices both all year long and during period of the highest activity in the beginning and mid-fall caused by Blue-Green algae (N=5.5x10⁶ cells/dm³, B=2.9 mg/dm³, S=3.82x10⁹ um²/dm³). The total number, biomass and the surface square of bacteria were invariably higher at the polluted station (N=3.5x10⁹ cells/dm³, B=1.3 mg/dm³, S=10.2x10⁹ um²/dm³) and exceeded that of the control station by 2.6, 1.8 and 2.3-fold, respectively. Moreover, the coefficients of variation of structural indices were 1.5-2.0-fold higher at the Station 2 as a result of inconsistency of volume and timing of sewage introduction there. The production studies revealed that despite the lack of substantial differences in bacterial reproductive activity (K, days^-1), the specific speed of energy flow through the bacterioplankton (A/B, days^-1) was 1.5-fold higher at the Station 1 compare to the polluted Station 2. The distribution of heterotrophic flagellates and infusorians, among which the dominated species belonged to genera Tintinnidium and Strombidium, was similar to that of phyto- and bacterioplankton. The structural indices of microzooplankton were several times higher at the Station 2 (N=748x10³ cells/dm³, B=87.7 mg/dm³, S=31.3x10⁶ um²/dm³) compared to the Station 1 (N=30x10³ cells/dm³, B=7.3 mg/dm³, S=3.2x10⁶ um²/dm³).
DE: 4235 Estuarine processes (0442)
SC: Biogeosciences [B]
MN: Fall Meeting 2005