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    STUDIA BIOLOGIA - Issue no. 2 / 2001  
         
  Article:   THE TERRESTRIAL ISOPOD FAUNA IN THE SUPERIOR BASIN AREA OF THE SOMEŞUL CALD RIVER.

Authors:  VALENTIN POPA, DANIELA MUREŞAN, NICOLAE TOMESCU.
 
       
         
  Abstract:  In 1998 and 1999 we have studied the terrestrial isopod fauna from the superior basin of the Someşul Cald River, from the area of gorges and downstream from the gorges. The biological samples have been collected using pitfall traps. We have collected a total number of 1073 individuals belonging to 8 species, of which six are paludicolous species (Ligidium hypnorum, L. germanicum, Hyloniscus transsylvanicus, H. mariae, H. siculus, Trichoniscus pygmaeus) and two sylvan species (Protracheoniscus politus and Trachelipus wächtleri). Distribution of the species in the region of the superior basin of the Someşul Cald River is diverse. Ligidium germanicum and Trichoniscus pygmaeus live only in the ecosystems located within the gorges, Ligidium hypnorum and Hyloniscus siculus live only in the ecosystems found downstream from the gorges, while the rest of the species live in the gorges as well as downstream from the gorges. The paludicolous species form communities with the sylvan species only in damp microhabitats with moderate temperatures, and not in the other biotopes of the ecosystems. The sylvan species live under the litter layer and have a much wider distribution compared to the paludicolous species. In two of the 11 studied ecosystems, the three species of genus Hyloniscus cohabit, and the cohabitation of congener species is a rare situation for terrestrial isopods. In the majority of ecosystems the numerically dominant species is Protracheoniscus politus. In some ecosystems the dominant species were Hyloniscus mariae, H. siculus and Trachelipus wächtleri. Except for the species of genus Ligidium, the females were dominant in the populations of the other species.  
         
     
         
         
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