The bottom Oligochaeta communities in sand pits of different trophic status in Upper Silesia (Southern Poland)

Abstract

Oligochaeta, occurring in the littoral zones of two sand pits, were sampled in order to determine the relationship between the oligochaete species and the waters' trophic level. Differences between sand pits attributable to community structure and to an overall higher abundance of oligochaetes, especially tubificids, were observed in Dzier_ zno Małe. Multivariate analyses (correspondence analysis [CA] and canonical correspondence analysis [CCA]) reveal correlations between the distribution patterns of oligochaete species and the concentration of nitrates, phosphates and dissolved oxygen. Some species, e.g. Dero digitata, Limnodrilus hoffmeisteri, Potamothrix hammoniensis, Nais simplex, Limnodrilus claparedeanus, Limnodrilus udekemianus and Tubifex tubifex, were more abundant in eutrophic sites. The results of the study showed that the richness of Oligochaeta species is not a good method for estimating the trophic levels of the studied sand pits. Indicators based on the share of oligo-, mesoand eutrophic species in Oligochaeta communities are better for evaluating the water quality in the studied reservoirs.

Environmental impact of heated mining waters on clitellate (Annelida: Clitellata) assemblages

“…Nevertheless, the species exchange as the response to the thermal inflow (Živić et al 2006) was analogous to our results. Similarly, changes in water chemistry, which are often accompanied by a higher trophic state, result not in decreased clitellate species diversity, but in changeover of the proportion of particular species with different ecological valences (Krodkiewska & Michalik-Kucharz 2009). We recorded species exchange below the mining water tributary and changes in the abundance of particular taxa, but overall, we observed a decrease in diversity and density.…”

Different levels of taxonomic resolution in bioassessment: a case study of oligochaeta in lowland streams

“…While some authors state that this species can tolerate wide organic pollution (e. g., Arimoro et al, 2007), in the present investigation S. lacustris was present in those sections with low to moderate impact. Other authors (Krodkiewska and Michalik, 2008) nevertheless argued that this species preferred environments with a low nutrient loading and a high content of dissolved oxygen. Nais communis was recorded in both sediments (at LI and MI sites) and vegetation (at all three types of sites).…”

“…Another species with broad habitat preferences-and one that can tolerate varied environments-was Dero furcatus (Zilli and Gagneten, 2005), though some authors consider that this species is usually dominant in coarse substrates (Lin and Yo, 2008). Dero digitata was likewise abundant in both the sediment and the vegetation and had been previously recorded at sites rich in nutrients and with low levels of disolved oxygen (Krodkiewska and Michalik, 2008) along with high concentrations of heavy metals (Rosso et al, 1994), such as Cu and Pb (Zilli and Gagneten, 2005). Dero pectinata was also present in both habitats and at the three types of sites (LI, MI, and HI), but with a much greater abundance at the MI sites.…”

Spatial and seasonal variations on Henneguya exilis prevalence on cage intensive cultured channel catfish (Ictaluruspunctatus) in Tamaulipas, Mexico

“…The farms located in reservoirs have several years of operation, whereas the river farm had its first period of operation during the study. In pond and cage aquaculture, faeces and unconsumed food can contribute to the accumulation of organic compounds underneath, which increases the concentration of nitrates, phosphates and decreasing dissolved oxygen, all of which has been correlated with the presence of some oligochaetes, including D. digitata (Krodkiewska & Michalik-Kucharz, 2009). Another factor that likely has an effect in the transmission of the parasite is the water current, which is slightly faster in the river, and could contribute to the absence of spores from cages.…”