Harpacticoid assemblages (Copepoda: Harpacticoida) in the hyporheic zone of four streams in central Slovenia | Združbe harpaktikoidov (Copepoda: Harpacticoida) v hiporeiku štirih rečic v osrednji Sloveniji

English. Harpacticoids are an important component of meiofaunal assemblages in hyporheic zone. The goal of this study was to investigate distribution patterns of interstitial harpacticoid assemblages from four pre-Alpine streams originating in the Dinaric Karst and flowing into the Ljubljanica River. The sampling was conducted in 2002 at 12 locations distributed at a distance of approximately 1 km along each stream including tributaries, at a depth of 30–60 cm in the wetted channel (three sites per location) and depths from 65 to 160 cm on the stream banks (one site per location) using a Bou-Rouch pump. Concurrently, the interstitial water’s physical and chemical parameters were measured at two sites within each location (streambed, streambank). A total of 24 harpacticoid species were found, 12 of which were stygobionts (i.e., species living exclusively in groundwaters). Among them, two previously unknown species for science were found. Harpacticoid assemblage composition, with the exception of those from the Iška stream, did not differ significantly between the streams, indicating interconnectivity of the interstitial milieu. Sediment structure, amounts of particulate organic matter, conductivity and redox conditions seemed to have certain impacts, indicating the importance of hydrological and geological settings for harpacticoid assemblages.

Slovenian. Cilj študije je bil raziskati vzorce porazdelitve intersticijskih združb harpaktikoidov v štirih rečicah, ki izvirajo v Dinarskem krasu in se izlivajo v reko Ljubljanico. Vzorčenje je bilo opravljeno leta 2002 na 12 lokacijah vzdolž vsake rečice s pritoki v globini 30–60 cm v omočeni rečni strugi (3 mesta) in v globinah od 65 do 160 cm na rečnih bregovih (1 mesto) s pomočjo Bou-Roucheve črpalke. Izmerili smo tudi fizikalne in kemijske lastnosti intersticialne vode v dveh vzorcih na vsaki lokaciji (omočena struga, rečni breg). Skupno smo našli 24 vrst harpaktikoidov, od tega 12 stigobiontov (tj. vrst, ki živijo izključno v podzemni vodi). Najdeni sta bili dve novi vrsti za znanost. Sestava združb harpaktikoidov, razen tistih v Iški, se med rečicami ni statistično značilno razlikovala, kar kaže na medsebojno povezanost intersticijskega življenjskega okolja. Kljub temu rezultati kažejo, da so sestava sedimentov, količine organskih delcev, prevodnost in redoks razmere tisti, ki najbolj vplivajo na sestavo združbe, kar kaže na pomembnost hidroloških in geoloških značilnosti v porečjih na sestavo združb harpaktikoidov v hiporeiku.