Geologic section along the motorway from Kozina to Koper in totality exposed geologic structure of the border belt between Adriatic-Apulian foreland and Dinarides that was formed by subthrusting of ...Adriatic-Apulian foreland (Istria, Friuli) underneath External Dinarides (Kras, Čičarija). During this process within the subthrusting belt a geomorphologic step was formed at sites where limestone became overthrust on flyschbeds.Apartof this geomorphologic step became known in the last decade of 20st century as the Kraški rob (Karst edge). With respect to geologic and geomorphologic considerations the term Kra{ki rob (»Karst Edge«) as landscape term for cliffs above the valleys of the Osapska reka and upper Rižana rivers should be distinguished from term karst edge (kra{ki rob) as a general term which is a synonym for the geomorphologic step consisting of precipitous cliffs and steep carbonate slopes situated entirely between the mouth of the river Timava and Mt. Učka that form the border belt between the karstic plateaus of Kras and Čičarije from one side, and the flysch Istria with the Trieste flysch coastal zone on the otherside.
Karst meadows belonging to the class Festuco-Brometea are regarded as species-rich habitats of national and European importance. Biodiversity in these areas is relatively high, but unlike most other ...semi-natural habitat types, it is highly influenced and facilitated by human activities. In the present study we document the presence and estimate abundance of butterfly species from three sampling plots in Kraki rob (SW Slovenia): two dry karst meadows and one pasture, which also includes an overgrown area. Over 16-day sampling occasions in May and June 2012, 63 species (including species complexes) were recorded. Nearly all of the species were recorded from dry karst meadows (60 ssp., 95%), while pasture (34 spp., 54%) and the overgrown site (28 spp., 44%) were less diverse. The abundance of butterflies was the lowest on the overgrown area. Although both grazing and overgrowth result in a decline in the number and abundance of species, we believe that traditional land use positively affects butterfly diversity, as it maintains open grasslands, a habitat that is preferred by most butterfly species to the later phases of succession. We therefore recommend the maintenance of a mosaic landscape structure, as it supports a wide range of butterfly fauna.
Krške livade razreda Festuco-Brometea su vrstama bogata staništa od nacionalne i europske važnosti. Bioraznolikost na tim područjima je relativno visoka, no u suprotnosti s nekim drugim poluprirodnim ...staništima, njihova bioraznolikost je pod velikim utjecajem ljudske aktivnosti. U ovom istraživanju smo zabilježili prisutnost i procijenili brojnost danjih leptira na tri uzorkovane plohe na Kraškom rubu (jugozapadna Slovenija): dvije krške livade i jednom pašnjaku koji je uključivao i zarasla područja. Tijekom 16-dnevnog terenskog istraživanja u svibnju i lipnju 2012., zabilježili smo 63 vrste leptira (uključujući i komplekse vrsta). Gotovo sve vrste su bile zabilježene na suhim krškim livadama (60 vrsta, 95%), dok je na pašnjaku (34 vrste, 54%) i na zaraslom području (28 vrsta, 44%) raznolikost bila manja. Brojnost leptira je bila najmanja na zaraslim površinama. Iako i zaraštanje i ispaša imaju za posljedicu opadanje u broju vrsta i brojnosti, smatramo da tradicionalno korištenje zemlje pozitivno utječe na raznolikost leptira. Razlog za to je prije svega sprječavanje zaraštanja livada, koje leptiri preferiraju više od staništa u kasnijim fazama sukcesije. Zato predlažemo održavanje mozaične strukture krajolika, jer će na taj način on biti primjeren za veći broj vrsta leptira.
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