DIGITALNA ARHIVA ŠUMARSKOG LISTA
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(Radulić 2010). The highest point of the island is peak Lokočina, 112 m a.s.l. In terms of size, it belongs in the group of small inhabited Croatian islands. According to the 2021 census (Institute of Statistics of the Republic of Croatia), 23 inhabitants live on the island of Rivanj. North-west of the Rivanj island and north of the Sestrunj island several islets stretch Sestrice (Fig. 1): Mala Sestrica (33 732 m2), Sridnja Sestrica (104 837 m2) and Vela Sestrica (187 520 m2) (Duplančić-Leder et al. 2004). These islets are uninhabited. Rivanj, like the other islands of the Zadar archipelago, has a Mediterranean climate, which according to the Köppen classification is designated as a Csa climate type (Seletković et al. 2011). The average annual air temperature is 15.6 °C, and the average annual precipitation is 888.7 mm (data for the Zadar meteorological station, provided by the Croatian Meteorological and Hydrological Service for 1989 – 2018). The largest area of the island is made up of macchia. Phytogeographically, the island is in the Eu-Mediterranean vegetation (Fraxino orni-Quercion ilicis alliance) while in the southern and protected positions it is in the Steno-Mediterranean vegetation (alliance Oleo sylvestris-Ceratonion siliquae). The Rivanj channel, together with the islets of Sestrice, is included in the Ecological Network of Croatia Natura 2000 as an area important for species and habitats (site code HR 3000074). The related Natura codes are: 1120 and 1170. Natura code 1120 is a habitat type of interest for the European Union, which is an endangered and priority habitat of Posidonia. The other Natura code 1170 are reefs (Anonymous 2019). Material and Methods MATERIJAL I METODE FLORA The study was carried out in the period between April 2019 and August 2020 in all seasons. Floristic surveys were conducted using the standard method described by Nikolić et al. (1998) and Nikolić (2006). Taxa were determined using the standard keys, books and guides (Tutin et al. 1968-1980, Trinajstić 1975-1986, Pignatti 1982, Tutin et al. 1993, Domac 1994, Delforge 2006). The nomenclature of plant taxa mainly follows Flora Croatica Database (Nikolić 2023), with the exception of some cultivated taxa, where European Garden Flora (Cullen & Knees 2011) was used. The nomenclature of taxa that are not according to Nikolić (2023) are marked with the symbol (*) in front of the taxa name. Their biological (sensu Raunkiaer 1934, Pignatti 1982) and chorological forms (geoelement) were determined according to Horvatić (1963) and Horvatić et al. (1967-1968). Life forms are marked with abbreviations: Ch (Chamaephyta), G (Geophyta), H (Hemicryptophyta), P (Phanerophyta), T (Therophyta) and Hy (Hydrophyta). The names of floral elements (geoelements) and the corresponding abbreviations used in the list of flora are shown in table 3. Family, life form and geoelement were attributed to each taxon, while other, more local characteristics (endemic, threatened, strictly protected, invasive) are given if they exist. Taxa that are considered endemic in the Croatian flora according to Nikolić et al. (2015), are marked with the abbreviation “end” Strictly protected (“sp”) taxa in Croatia were defined according to Anonymous (2013b, 2016). Invasive plant taxa (IAS) have been defined according to Boršić et al. (2008) and Nikolić et al. (2014a). Categorization of endangered taxa was done according to the Red Book of Vascular Flora of the Republic of Croatia (Nikolić & Topić 2005). They are marked with international abbreviations that indicate the degree of endangerment: CR (Critically endangered), EN (Endangered), VU (Vulnerable) and NT (Near Threatened). The species noted by Horvatić (1961/1962) and Perinčić et al. 2016 are especially indicated in the list of flora (abbreviation: Ho = Horvatić , Pe = Perinčić et al.). VEGETATION The vegetation researches of the island of Rivanj and tree Sestrice islets were carried out in 2019 and 2020. The vegetation investigations were conducted according to the Zürich-Montpellier school method (Braun-Blanquet 1964). Thirty phytosociological relevés of the shrubs and forest vegetation were produced during personal investigations. In the phytosociological tables (Tables 5–7) the nomenclature of taxa follows Nikolić (2023). The phytosociological nomenclature follows the „International Code of Phytosociological Nomenclature“ (Theurillat et al. 2020). Habitat types and Natura code based on the Regulation on the Ecological Network and List of Habitat Types (Anonymous 2013a, 2014). Classification into particular syntaxonomical categories is based on Mucina et al. (2016) and Škvorc et al. (2017). The coordinates of the phytosociological relevés are next to the dates in Appendix 1 , produced in accordance with Gauss-Krüger. Classification of relevés was done using cluster analysis in the PC-ORD 5.0 (MjM Software Design, Gleneden Beach, OR, US). Square root transformation of percentage cover values of species, Beta flexible (β = -0.25) for group linkage with Relative Sørensen index as the distance measure was used (Van der Maarel 1979). FLORA: RESULTS – REZULTATI On the island of Rivanj, 346 taxa of vascular flora have been recorded that grow nativ on the island or spread spontaneously outside of cultivation. Also, 84 taxa were recorded |