The impact of river dredging on ostracod assemblages in the Krąpiel River (NW Poland)
Szlauer-Łukaszewska, Agnieszka; Zawal, Andrzej
published: Dec 1, 2014
ArtNo. ESP141018503007, Price: 29.00 €
We studied the Ostracoda assemblages in a small lowland river, under the influence of dredging and natural factors: water flow velocity, type of substratum, and the degree of submerged vegetation coverage of the river bottom. Dredging reduced ostracod species richness and density, but also increased the Evenness index. The process of recolonization of dredged areas by Ostracoda assemblages was completed by the seventh month following the dredging. The proportion of sand in the substrate explained 12% of the total variability of species occurrence, whereas the degree of vegetation coverage corresponded to 6% and dredging to 3%. Total ostracod density increased with the proportion of sand in the substrate and degree of vegetation coverage. On the other hand, higher proportions of detritus and mud resulted in a decrease in ostracod density.