Conservation assessment of the butterfly fauna along the River Sava between Krško and the state border | Naravovarstveno vrednotenje favne dnevnih metuljev ob reki Savi med Krškim in državno mejo

anglais. An inventory of butterfly fauna was carried out in 2008 within the southern part of the Ecological Important Area »the Sava River between Radeče and the state border with Croatia« with the aim of evaluating the most important areas for butterflies. Butterfly fauna was surveyed within a study area of 32 km2, using the transect method. Twenty-one combined habitat types were included in the transect lines, with a total length of 19.2 km. The following parameters were used to evaluate the conservation importance of the combined habitat types: species richness of the combined habitat type, population density of species in combined habitat type, total population density of combined habitat type, maximum population density of species in combined habitat type, number of species with maximum population density in combined habitat type, number of threatened species in combined habitat type and number of threatened species with maximum population density in combined habitat type. A total of 69 species of butterflies (38% of Slovene butterfly fauna) were recorded, 10 of which are threatened on national or European level. The most important combined habitat types for butterflies are extensively managed dry grasslands, abandoned dry grasslands, some types of semi-intensively used grasslands, some types of ruderal communities, and dry woodland rides and edges.On the basis of the distribution of the most important combined habitat types in the study area, four important areas for butterflies were designated, with a total area of 6.6 km2. They are important for preserving threatened species, ecological specialists and other rare or locally distributed species in the sub-pannonian part of SE Slovenia.

slovène. V južnem delu Ekološko pomembnega območja »Sava od Radeč do državne meje« (EPO Id: 63700), med Krškim in državno mejo s Hrvaško, smo v letu 2008 izvedli inventarizacijo favne dnevnih metuljev z namenom opredeliti naravovarstveno najpomembnejša območja za dnevne metulje v EPO. V raziskovanem območju s površino 32 km2 smo na transektih dolžine 19,2 km z metodo transektnega popisa inventarizirali relativno številčnost vrst v 21 zbirnih habitatnih tipih. Za naravovarstveno ovrednotenje zbirnih habitatnih tipov smo uporabili naslednje parametre: vrstno bogastvo zbirnega habitatnega tipa, populacijska gostota vrste v zbirnem habitatnem tipu, celokupna populacijska gostota v zbirnem habitatnem tipu, maksimalna populacijska gostota vrste v zbirnem habitatnem tipu, število vrst z maksimalno populacijsko gostoto v zbirnem habitatnem tipu in število ogroženih vrstv zbirnem habitatnem tipu. Zabeležili smo 69 vrst dnevnih metuljev (38 % favne dnevnih metuljev Slovenije), med njimi 10 v nacionalnem ali evropskem merilu ogroženih vrst. Naravovarstveno najpomembnejši habitatni tipi za dnevne metulje so ekstenzivno gospodarjeni suhi travniki, zaraščajoča suha travišča, nekateri polintenzivno gospodarjeni travniki, nekatere ruderalne združbe ter gozdne poti in robovi na suhih rastiščih. Na podlagi razširjenosti najpomembnejših zbirnih habitatnih tipov v raziskovanem območju smo opredelili štiri naravovarstveno pomembna območja za dnevne metulje s skupno površino 6,6 km2. Območja so pomembna za ohranjanje ogroženih in drugih ekološko specializiranih, redkih ali lokalno razširjenih vrstv območju subpanonske JV Slovenije.