Feeding spectra of bivalve mollusks Unio and Dreissena from Kanevskoe Reservoir, Ukraine: are they food competitors or not?

Zoological Studies

Table 4 Abundance, biomass, and taxonomic composition of zooplankton and zoobenthos from Kanevskoe Reservoir, Ukraine

	Date	Number	Total abundance (individuals/L)	Total biomass (mg/L)	Dominant species	Percent total biomass
Zooplankton	9 June 2010	32	56.270	0.496	Dreissena, Veliger	42.6
Zooplankton	9 June 2010	32	56.270	0.496	Cyclopoida juv., Copepoda	30.7
			Total abundance (individuals/m ² )	Total biomass (g/m ² )
Zoobenthos	16 June 2010
Unionidae		3	21.7	972.4	Unio tumidus	17.8
					Unio pictorum	16.4
					Anodonta anatina	16.6
Dreissenidae		2	1147.3	517.76	Dreissena polymorpha	37.1
Dreissenidae		2	1147.3	517.76	Dreissena bugensis	0.2
Others		27	596.3	165.72	Viviparus viviparous
					Bithynia tentaculata	95.09^a
					Theodoxus fluviatilis	2.37^a
					Lithoglyphus naticoides	1.14^a
					Dikerogammarus	0.58^a
					Haemobaphes	0.44^a