Habitat type *6110 in the area of the Krka National Park
Open xerothermophilic pioneer communities on carbonate stony soil
The habitat type Open xerothermophilic pioneer communities on carbonate stony soil (*6110), which according to the National Classification of Habitats (NN 27/2021) encomopasses the habitat type B.2.4 (Pioneer communities on carbonate outcrops), is represented in Croatia with two habitat types: B.2.4.1. (Pioneer communities of succulents) and B.2.4.2. (Stands of mountain spear grass). These communities appear in natural as well as artificial habitats, most often on dolomitic substrates, and represent the initial phase of vegetational succession.
In the period from April to June 2023, an initial survey of this habitat type was carried out in the area of the Krka National Park, cited in the List of Endangered and/or Rare Habitat Types of national and European importance represented in the territory of the Republic of Croatia, which is also the target habitat type of the ecological network Natura 2000 in the wider area of the Krka NP (HR2000918).
Preliminary research has shown that habitat type *6110 (NKS B.2.4.) is present within the boundaries of the Krka NP in the following areas: Tanjgina Glavica, Marjanovića Torovi, Roški Slap, Visovačko Lake (Stinice), and the Čikola canyon (around Torka and around the fortress of Ključica), where there are pioneer communities of succulents on carbonate outcroppings (NKS B.2.4.1), while pioneer stands of mountain spike grass on carbonate outcrops (NKS B.2.4.2) were not found. At confirmed sites, the community mostly covers small, fragmented areas of 1-5 m2.
The following species were recorded as the most common species in the composition of the found pioneer communities of succulents on carbonate deposits: European stonecrop (Sedum ochroleucum), tasteless stonecrop (S. sexangulare), goldmoss stonecrop (S. acre), red stonecrop (S. rubens), giant stonecrop (Sedum telephium ssp. maximum), common whitlow grass (Erophila verna ssp. praecox), Hutchinsia (Hornungia petraea), and rue-leaved saxifrage (Saxifraga tridactylites).
In order to determine in more detail the distribution and composition of the habitat type *6110 within the boundaries of the Park, additional research will be conducted with an emphasis on producing a larger number of phytocenological records, so that protective measures could be implemented with the aim of preventing vegetation succession.
Research
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