Distribution patterns and habitat requirements of the species of the family Cobitidae in Slovakia

Abstract

RozSfienfa habitatov6niroky druhrfiieledi Cobitidaena Slovensku Mgr.LadislavPek6rik (souhmk dizertadnipr6ciDistributionpattemsandhabitatrequirementsof the speciesof thefamily Cobitidaein Slovakiav deskdmjazyce) V5echnytii druhydelediCobitidaejsouv soudasnostinaSlovenskurelativnESiroceroz5iien6(s vjjimkou Baltskdhorimoii).Cobitiselongatoidesje nejroz5iienEj5ianejpodefirdjBijak v distdform6tak i v hybridnichdiploidnE-polploidnichkomplexech.$s$rtuje sev iekdchi v primrirnfcha sekund6rnichakvatic[fch habitatechniLin.Z primrirnichbiotopripreferujeiidni koryto atEZiStE rnjslqrtuv sekundr{rnichtypechbiotoptije v melioradnichkan6lechat1ilebnichjam6ch.Pii porovnrinfs roky 1955-1965nedoSlokvlraznf zmEnEv roz5iienitohotodruhu.Typick6druhovdspoledenstvopro tentoreofilni druhtvoii eurytopnfalimnofilni druhy.Sabanejewiabalcanicasevyskytujevdt5inouv sdednichrisecichvodnichtokt, v prvniiaddv povodiBodrogu(iekyLaborec,OndavaaTopl'a)na v'-ichodnimSlovensku.Y zhpadniddstiSlovenska(povodiDunaje)setentodruhvyskytujev men5i miie aspi5eosfi:rivkovitd.Av5akv poslednichletechbyli objevenydaltsipopulacev zhpadnid6sti SlovenskaapravdEpodobndje jeji roz5iieniv t5rtooblastipodhodnoceno.Distribucedruhuje omezena jenomnaprimrirnibiotopy,ato ieky stwdBimsubstr6tem.Tentodruhbyl dlovdkemv minulosti nejviceovlivnEnato...

Distribution patterns and major environmental correlations of the species of the family Cobitidae are presented here. All three species are still relativem widely distributed in Slovakia. Comparing with the past, no rapid ganges have been found. However, river regulation, pollution and the lowland amelioration affected the distribution of these species. Following the results of the occurrence of Balkan spined loach (Sabanejewia balcanica) within the mesohabitat scale, distance from source, slope, water depth and vegetation cover are the most influential variables in the proposed model. All these variables that contribute to our model explanation determine the stream morphology that affects the consequences of local temperature conditions and other abiotic factors as oxygen amount. Switching to microhabitat spatial scale, several microhabitat variables significantly influence the spatial distribution of analysed species. Depth more than 40 cm, refuges stones and point near bank (<15% of river width) are the most influential ones supplemented with substratum sand, substratum cobbles, substratum boulders, no refuges, refuges woody, depth 0-10 cm and maximum velocity none. Balkan spined loach occurs in the microhabitats occupied also by young-of-the-year (YOY) individuals and common minnow (Phoxinus...