Laserfiche WebLink
a <br />benthos and the plankton. The densities were highest in the plankton for the floodplain <br />and in the benthos for the river. The calanoid densities were higher in the river <br />benthos rather than plankton, suggesting an ability to adapt to a benthic lifestyle. <br />There were no substantial numbers of calanoids collected in the backwaters (Table <br />4.). <br />Cladocera community structure <br />Fourteen species of cladocerans were present. The floodplain had the highest <br />number with 12, the backwaters had ten, and the river had three species. Three <br />appear to be most closely associated with the benthos: Along spp., Ill~,ocryptus <br />i u ,and Macrothrix 1 is rni . Illyocry~tus rid is a known benthic <br />inhabitant (Evans and Stewart 1977). There were no abundant cladocerans in the <br />river. The floodplain had the highest cladoceran densities during June but by the third <br />sample period in August very few were present (Table 4.). <br />13 <br />