The density and dominance of benthic and epiphytic fauna of selected meioinvertebrate groups were studied in various types of standing water in eastern Poland: two lakes (mesotrophic and polytrophic) and two small water bodies (an oligotrophic pond and a peat-hag). The plants from which the fauna were collected included: Ceratophyllum demersum L., Elodea canadensis Michx., Hydrocharis morsus-ranae L., Myriophyllum spicatum L., Nuphar lutea (L.) Sibth. (i) Sm., Potamogeton natans L., and Stratiotes aloides L. In the taken material, the density and dominance structure of benthic and epiphytic fauna of the taxa Turbellaria, Gastrotricha, Rotifera, and Nematoda were estimated. Total density of the studied phyla in bottom sediments and on elodeids fluctuated from 1315.0 to 3156.0 10³ indiv. m⁻², and from 2078.0 to 3954.0 10³ indiv. m⁻², respectively. Mean density of meioinvertebrates per 100 g dry weight of plants in the studied waterbodies amounted to from 125.8 to 289.0 10³ indiv. 100 g⁻¹ d.w. The density of meioinvertebrate fauna of elodeids was higher than in bottom sediments in all studied reservoirs and the differences were statistically significant. Epiphytic meioinvertebrate fauna in Lake Bikcze of high trophic level shows low similarity to the mesotrophic one, and to the oligotrophic pond, but shows high similarity to the peat-hag. The development of the meioinvertebrate community on elodeids is mainly affected by the trophic status of the reservoir and not by the character of vegetation.
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