Water mites (Hydrachnidia) of Drawa river (NW Poland)
Paper ID : 1071-IPCA4
Andrzej Zawal *1, Tomasz Olechwir2, Edyta Stępień2
1Institute of Marine and Environmental Sciences, Centre of Molecular Biology & Biotechnology, University of Szczecin, Poland
2Institute of Marine and Environmental Sciences, University of Szczecin, Wąska 13, 71–415 Szczecin, Poland
The water mite communities of the Drawa river were investigated in 1988 year. The samples were taken two times in spring (April, May) and in late summer-autumn (August, September). The total of 1349 specimens belong to 52 species of water mites were collected. We decided to distingush Lebertia exuta despide of synonimization it with L. ineaqualis by Gerecke, because we collected both the species and find good destinguishing features. The status of the species should be check again. The most abundant species was Hygrobates setosus (13.4%) followed by Sperchon papillosus (10.5%), S. clupeifer (9.8%), Torrenticola amplexa (8.5%), Limnesia maculata (7.0%), Arrenurus albator (5,4%) and Lebertia ineaqualis (5.2%). The largest synecological group were rheophiles and rheobionts (44.2% species, 74.9% specimens) followed by small water bodies species (30.8% species, 11.8% specimens), lake species (17.3% species, 11.6% specimens) species from astatic waters (5.8% species, 0.2% specimens) and crenophilous species (1.9% species, 0.1% specimens). The most stagnophilous species were connected with sections of river after lake or spring. More specimens (894) but less species (31) were caught in the lotic zone of the river than in the lentic zone (455 specimens, 40 species). The species most associated with the lotic zone was Sperchon papillosus, which was caught mainly on a substrate of gravel and stones with a small amount of sandy sediments, sparsely covered with mosses. The species most associated with the lentic zone was Hygrobates setosus, which was caught mainly on sandy and muddy bottom.
Lebertia, Hygrobates, Torrenticola, Sperchon, Limnesia, Arrenurus
Status : Abstract Accepted (Poster Presentation)