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Abstract: With a phytosociological analysis of more than 200 relevés on more than 25 localities with Gladiolus palustrisand (or) G. illyricusin western and southwestern Slovenia we identified more than 15 communities of association rank that belong to at least eight vegetation alliances and five classes. We determined that these two species can grow on the same localities and sites, but Gladiolus palustrisflowers at least 14 days after G. illyricus. Another reliable distinguishing characteristic is the fibrous tunic covering the corm. Gladiolus palustris is threatened in most of the examined localities, except for the Banjšice Plateau and the Slavnik range in Čičarija, but the current nature conservation policy in Slovenia does not provide for its preservation.
Keywords: Gladiolus palustris, G. illyricus, phytosociology, syntaxonomy, Natura 2000, nature conservation, Slovenia
Published in DiRROS: 14.01.2026; Views: 51; Downloads: 36
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Abstract: The fan mussel Pinna nobilis is a bivalve endemic to the Mediterranean Sea that is listed as Critically Endangered on the IUCN Red List. Its decline is due to a disease that has led to mass mortalities throughout the Mediterranean. The Gulf of Trieste (northern Adriatic) used to harbour one of the densest populations of P. nobilis, but since 2019, it has also been affected by this disease. The aim of this work was to analyse the growth of P. nobilis in the Slovenian part of the Gulf, with 3 case studies: (1) in situ measurement of adults before the mass mortality event (MME), (2) in situ measurement of juveniles after the MME and (3) ex situ measurement of juveniles kept in the laboratory. The pre-MME growth rate was comparable to that in other areas of the Gulf. In the first years of life, the growth rate of P. nobilis is higher than the growth rate reported in the southern Adriatic, and comparable to the growth rate in the Spanish lagoons. This is probably related to the physico-chemical conditions and confirms the potential of the area for restoration actions. Captive growth of juveniles could be an effective conservation measure, although juveniles kept in the laboratory grow more slowly than those in the sea, probably because of their lower immune response. Temperature plays an ambivalent role, as it increases the growth rate but also triggers the parasites responsible for the MME, which is of concern, given the recent rise of seawater temperatures and heatwaves.
Keywords: fan mussel, model growth, temperature, conservation, northern Adriatic sea
Published in DiRROS: 23.12.2025; Views: 200; Downloads: 94
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Abstract: etween 1st and 6th June 2023, we conducted floristic research on sev-eral sites in the upper Neretva River valley and along Zalomka River at Nevesinjsko Polje. We recorded 933 taxa in total; 897 plant taxa including 125 bryophytes were found at 51 localities in the upper Neretva River val-ley, and 200 plant taxa, including 32 bryophytes, were found at 11 sites in the Zalomka River valley. Among the registered taxa, 39 taxa are endemic to the Balkan Peninsula, 56 are listed in the List of endangered and rare taxa of Bosnia and Herzegovina, 27 are on the Red List of the Federation of Bosnia and Herzegovina, and 95 taxa are protected in the Republic of Srpska. We also registered several species new to the flora of Bosnia and Herzegovina. Among Angiosperms these were Barbarea intermedia, Lamium hybridum, Myosotis sicula and Poa ursina, and among bryophytes Fissidens gracilifolius, Grimmia dissimulata, Plagiomnium ellipticum, Schistidium robustum, Sphenolobus minutus, Tortella fasciculata and T. pseudofragilis. Our study reveals the high nature conservation value of the upper Neretva and Zalomka River valleys that should be protected for future generations. In addition, further systematic research of the flora of Bosnia and Herzegovina is needed
Keywords: angiosperms, mosses, nature conservation, Neretva River, vegetation, are species
Published in DiRROS: 16.10.2025; Views: 292; Downloads: 125
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Abstract: The fan mussel Pinna nobilis is the largest bivalve species in the Mediterranean Sea and provides numerous ecosystem services. It is classified as critically endangered by IUCN (International Union for Conservation of Nature) due to severe mass mortality events throughout the Mediterranean. The aims of this work are as follows: (i) to assess the current recruitment potential of the species, (ii) to enhance recruitment by keeping juveniles in controlled conditions before releasing them back into the sea, and (iii) to assess the health status of recruits. In the period 2022–2023, larval collectors were set up in the Gulf of Trieste as part of the LIFE Pinna project. The collected individuals were kept in aquaria in two different facilities under different conditions: (a) a closed system with constant water temperature, live phytoplankton, and commercial food and (b) an open system with ambient seawater temperature and commercial food. A clear temporal and spatial variability in recruitment was observed: 13 recruits were found in 2022 and 50 recruits in 2023. The live specimens were between 0.5 and 8 cm in size upon collection and larger in 2023. The growth and survival rate did not differ significantly between the two systems, but the average monthly growth and survival rate were related to the initial size of the juveniles.
Keywords: pen shell, ex situ maintenance, in situ maintenance, Haplosporidium pinnae, Mycobacterium, conservation, marine biology
Published in DiRROS: 08.10.2025; Views: 311; Downloads: 134
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Abstract: Maintaining the conservation status of habitat types such as the ravine forests (Tilio-Acerion) assessed in this study is a priority of the European Natura 2000 network. Ravine forests often occur in smaller, fragmented areas, but are widely distributed throughout European forests. Reliable indicators of the conservation status of Natura 2000 habitats, which support monitoring and reporting under Article 17 of the Habitats Directive, are often not available. Therefore, we tested a set of 161 structural and compositional variables as potential indicators of the conservation status of close-to-nature managed ravine forests in a Natura 2000 site in eastern Slovenia. The studied forests ranged from Acer pseudoplatanus-dominated stands to those dominated by Fraxinus excelsior or Tilia species. Most forests were classified as having either a favourable or inadequate conservation status. The main pressures included game browsing and mortality of the key tree species, primarily caused by invasive alien fungi. Favourable conservation status was associated with less intensively managed Tilia-dominated stands on rocky ridges and steep slopes. It was also linked to higher tree layer cover, particularly of Acer pseudoplatanus, in well-preserved forest stands. Conversely, indicators of bad conservation status were associated with Fraxinus excelsior-dominated stands that had been severely affected by invasive alien fungi, resulting in increased volumes of standing and lying deadwood. The resulting tree mortality created more open stand canopies with increased light availability at the forest floor, as indicated by the higher number of plant species in the herb and shrub layer. The conservation status of ravine forests is likely to be increasingly threatened by the adverse effects of climate change, including pests and disease outbreaks and other disturbances. To ensure the continued favourable conservation status of ravine forests, it is essential to monitor key indicators and apply appropriate forest management measures.
Keywords: forest habitats, vegetation, pressures, conservation, indicators, Eastern Slovenia, forest stands
Published in DiRROS: 09.09.2025; Views: 403; Downloads: 167
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