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Differentiation of microbial loop components in small anthropogenic reservoirs

Mieczan T.

Polish Journal of Ecology

2014

Vol. 62, nr 2

323--334

The interactions between bacteria and heterotrophic protists are essential for the ecosystem ecology of freshwater. The basic objective of the study was to analyse the seasonal dynamics of changes in particular elements of the microbial loop (bacteria, flagellates and ciliates) in various types of small water bodies. The classification into particular trophic groups of ciliates and the role of the organisms in the functioning of the microbial loop was also analysed. The abundance and biomass of microbial communities has been assessed in eight reservoirs of varied origin (peat pits, clay pits and post-mining reservoirs), in order to test a hypothesis that the microbial communities differed among reservoirs and that differences could be related to fertility of habitats. Fieldwork was done from April to November 2010-2012. From each reservoirs once a month, three samples were collected with a 5-litre planktonic sampler. Samples were taken on two stations: pelagic – located in the deepest part of each reservoirs and littoral. The density and biomass of bacteria and protists significantly differed between the studied reservoirs, with the lowest numbers in the peat pits and clay pits and the highest in the post-mining reservoirs. All of the studied reservoirs were generally dominated by ciliates belonging to the orders Oligotrichida and Scuticociliatida constituted > 30% of the total numbers. In all reservoirs bacterivorous ciliates occurred in the highest numbers, while predators ones in the lowest. Generally, concentrations of nutrients (especially total phosphorus) is not a factor having the strongest effect on the abundance of bacteria and heterotrophic flagellates and the number and strength of correlations between microbial loop components. The relations demonstrated between bacteria and protists point to an important process of matter and energy flow from bacteria to higher trophic levels. In peat pits, relations between bacteria and ciliates were stronger. Only in clay pits and postmining reservoirs the correlation between bacteria and heterotrophic flagellates were found. Consuming much of bacterial productions, protozoa become an important link between bacteria and micrometazoans.

Structure of rotifer communities of restored small peat-bog resevoirs of Poleski National Park

Demetraki-Paleolog A., Tarkowska-Kukuryk M.

Archives of Environmental Protection

2010

Vol. 36, no. 4

21-30

Artificial small water reservoirs existing over peatbogs of Łeczyńsko-Włodawskie Lakeland have high ecological value. Planktonic rotifer communities of the reservoirs are characterized by high species diversity, presence of rare species as well as high abundance of periphytic and benthic-periphytic forms. Low nutrients concentrations of studied reservoirs confirmed low total rotifers density, presence of indicatory species and high ratio of algaevorous to detritivorous species. The analysis of domination structure of planktonic rotifers showed very low stability of their community and high vulnerability for changes of habitat conditions.

Jednym z ciekawszych i mniej poznanych ekosystemów wodnych są różnego typu torfianki: węglanowe, humusowe i eutroficzne. Analiza wrotków planktonowych w siedmiu takich zbiornikach Pojezierza Łęczyńsko- Włodawskiego wykazała: dużą różnorodność gatunkową, obecność gatunków rzadkich, znaczny udział form peryfitonowych i bentosowo-peryfitonowych oraz duże różnice faunistyczne między wrotkami różnych torfianek. Mała liczebność wrotków, gatunki wskaźnikowe, znaczny udział gatunków roślinożernych w stosunku do detrytusożernych wskazują na małą żyzności większości torfianek. Mimo tych cech analiza struktury dominacji wykazała brak zrównoważenia zgrupowań wrotków i możliwość ich małej stabilności w przypadku jakichkolwiek zmian środowiskowych.