951. Holocene climate variability in Slovenia : a reviewMatej Lipar, Sonja Lojen, Mateja Breg Valjavec, Maja Andrič, Andrej Šmuc, Tom Levanič, Jure Tičar, Matija Zorn, Mateja Ferk, 2024, review article Keywords: palaeoclimate, climate proxy, glaciers, pollen, tree-rings, sediment, speleothems, historical data Published in DiRROS: 21.06.2024; Views: 232; Downloads: 162
Full text (2,08 MB) |
952. Lastnosti lesa iz rudnika SitarjevecMiha Humar, Boštjan Lesar, Davor Kržišnik, Andreja Pondelak, Andrijana Sever Škapin, Angela Balzano, José Gonçalves, 2024, original scientific article Abstract: Rudarska tradicija v Litiji, segajoča v staro železno dobo, je vključevala intenzivno uporabo lesa v rudnikih, še posebej za podporo in zaščito rovov. Rudnik Sitarjevec je bil znova odprt za turizem leta 2017, in v letu 2021 so odprli glavni rov. Les ostaja ključen material v rudnikih, čeprav so ga v preteklosti nadomeščali z drugimi materiali. Uporabljeni les je izpostavljen razkroju zaradi visoke vlažnosti in gliv, kot je bela hišna goba. Ta gliva lahko povzroči razgradnjo lesa in je pogosta v vlažnih okoljih rudnikov. Obstoj gliv je pomemben, saj lahko vplivajo na obiskovalce rudnika. Visoka relativna zračna vlažnost (96,6 %) in stalna temperatura (10,1 °C) v rudniku ustvarjata razmere, ki so ugodne za rast gliv, vendar pa relativno nizka temperatura ni omejujoč dejavnik za razgradnjo lesa. Koncentracija glivnih spor v rudniku je visoka in je razložena z razširjenostjo gliv v samem rudniku. Poleg tega smo opazili, da je v lesu veliko anorganskih onesnaževal ter veliko kristalov. Keywords: razkroj, bela hišna goba, težke kovine, kristali, spore Published in DiRROS: 21.06.2024; Views: 441; Downloads: 143
Full text (4,45 MB) |
953. Cene gozdnih zemljišč v Sloveniji v obdobju 2018-2022Matjaž Dovečar, Jaša Saražin, Matevž Triplat, 2024, original scientific article Abstract: V prispevku analiziramo trg z gozdnimi zemljišči v Sloveniji v zadnjih petih letih. Kot glavni vir podatkov je bila uporabljena Evidenca trga nepremičnin, iz katere je mogoče s predlaganim metodoloških pristopom izluščiti kupoprodaje z zgolj gozdnimi zemljišči. Analiza podatkov kaže naraščanje cen gozdnih zemljišč skozi čas, statistično pomembne razlike med statističnimi regijami ter obstoj visokih cen gozdnih zemljišč. Z namenom zagotovitve zanesljivih rezultatov smo izločili izrazite vrednosti ali osamelce in tako prikazali bolj reprezentativno stanje nepremičninskega trga z gozdnimi zemljišči v Sloveniji. Aritmetična sredina cen gozdnih zemljišč celotne baze podatkov znaša 2,82 EUR/m 2 , medtem ko ta po odstranitvi osamelcev dosega 0,64 EUR/m 2 s pomembno nižjimi standardnimi odkloni. Petletna rast cen median gozdnih zemljišč na ravni države znaša 17,31 % in se med statističnimi regijami pomembno razlikuje. Raziskava prinaša vpogled v dejanske tržne razmere gozdnih zemljišč, kar je koristno tako za širšo javnost kot za strokovnjake, zlasti cenilce nepremičnin. Keywords: gozdna posest, nepremičnine, ocenjevanje vrednosti, gozdovi, vrednost gozdov, primerjalne vrednosti Published in DiRROS: 21.06.2024; Views: 548; Downloads: 182
Full text (3,05 MB) |
954. Patterns of deadwood volume and dynamics in slovenian forestsGal Kušar, Mathias Naumann, 2024, original scientific article Abstract: Deadwood, and its temporal and spatial variation, plays an important role in several forest ecosystem services. This study demonstrates the assessment of deadwood dynamics using data from Slovenian national forest inventory permanent sampling plots, employing a mass-balance approach. Our results reveal that deadwood volume is a highly variable metric across regions, deadwood types and tree species. Despite the influx of large volumes of new deadwood due to recent natural disturbances, only moderate increases in deadwood volume were observed between 2007 and 2018. This was mainly offset by deadwood losses due to salvage logging and decomposition. The extent of deadwood losses varied considerably by species. We discuss the implications of the calculation method on estimating changes in deadwood volume, compare these findings with existing literature on deadwood and highlight promising areas for future research activities to better understand deadwood dynamics. Keywords: deadwood, carbon, natural disturbances, decomposition Published in DiRROS: 21.06.2024; Views: 479; Downloads: 148
Full text (1,17 MB) |
955. Verifikacijsko poročilo LVG POS 025Zina Devetak, 2024, expertise, arbitration decision Keywords: varstvo gozdov, morfološke analize, Bretziella fagacearum, hrastova uvelost, diagnostični protokol, molekularna analiza, ekstrakcija DNA, PCR v realnem času, verifikacija Published in DiRROS: 21.06.2024; Views: 207; Downloads: 0 This document has many files! More... |
956. |
957. Okadaic acid as a major problem for the seafood safety (Mytilus galloprovincialis) and the dynamics of toxic phytoplankton in the Slovenian coastal sea (Gulf of Trieste, Adriatic Sea)Urška Henigman, Patricija Mozetič, Janja Francé, Tanja Knific, Stanka Grebenc, Jožica Dolenc, Andrej Kirbiš, Majda Biasizzo, 2024, original scientific article Abstract: This article presents the first results on shellfish toxicity in the Slovenian sea (Gulf of Trieste, Adriatic Sea) since the analytical methods for the detection of biotoxins (PSP, ASP, DSP and other lipophilic toxins) in bivalve molluscs were included in the national monitoring program in 2013. In addition to toxins, the composition and abundance of toxic phytoplankton and general environmental characteristics of the seawater (surface temperature and salinity) were also monitored. During the 2014–2019 study period, only lipophilic toxins were detected (78 positive tests out of 446 runs), of which okadaic acid (OA) predominated in 97% of cases, while dinophysistoxin-2 and yessotoxins only gave a positive result in one sampling event each. The number of samples that did not comply with the EC Regulation for the OA group was 17 or 3.8% of all tests performed, all of which took place from September to November, while a few positive OA tests were also recorded in December, April, and May. This toxicity pattern was consistent with the occurrence pattern of the five most common DSP-producing dinoflagellates, which was supported by the development of warm and thermohaline stratified waters: Dinophysis caudata, D. fortii, D. sacculus, D. tripos and Phalacroma rotundatum. The strong correlation (r = 0.611, p<0.001) between D. fortii, reaching abundances of up to 950 cells L−1, and OA suggests that D. fortii is the main cause of OA production in Slovenian waters. Strong interannual variations in OA and phytoplankton dynamics, exacerbated by the effects of anthropogenic impacts in this coastal ecosystem, reduce the predictability of toxicity events and require continuous and efficient monitoring. Our results also show that the introduction of the LC-MS/MS method for lipophilic toxins has improved the management of aquaculture activities, which was not as accurate based on mouse bioassays. Keywords: biotoxins, okadaic acid, toxic phytoplankton, LC-MS/MS, toxicity, Adriatic Sea, hydrobiology, marine biology Published in DiRROS: 19.06.2024; Views: 203; Downloads: 171
Full text (1,83 MB) This document has many files! More... |
958. Wing buzzing as a mechanism for generating vibrational signals in psyllids (Hemiptera: Psylloidea)Jernej Polajnar, Elizaveta Kvinikadze, Adam W. Harley, Igor Malenovský, 2024, original scientific article Abstract: Psyllids, or jumping plant lice (Hemiptera: Sternorrhyncha: Psylloidea), are a group of small phytophagous insects that include some important pests of crops worldwide. Sexual communication of psyllids occurs via vibrations transmitted through host plants, which play an important role in mate recognition and localization. The signals are species-specific and can be used to aid in psyllid taxonomy and pest control. Several hypotheses have been proposed for the mechanism that generates these vibrations, of which stridulation, that is, friction between parts of the forewing and thorax, has received the most attention. We have investigated vibrational communication in the European pear psyllid species Cacopsylla pyrisuga (Foerster, 1848) using laser vibrometry and high-speed video recording, to directly observe the movements associated with signal production. We describe for the first time the basic characteristics of the signals and signal emission of this species. Based on observations and analysis of the video recordings using a point-tracking algorithm, and their comparison with laser vibrometer recordings, we argue that males of C. pyrisuga produce the vibrations primarily by wing buzzing, that is, tremulation that does not involve friction between the wings and thorax. Comparing observed signal properties with previously published data, we predict that wing buzzing is the main mechanism of signal production in all vibrating psyllids. Keywords: biotremology, substrate-borne vibrational signals, vibrational signals, jumping plant lice, tremulation Published in DiRROS: 19.06.2024; Views: 196; Downloads: 174
Full text (2,29 MB) This document has many files! More... |
959. DNA barcoding insufficiently identifies European wild bees (Hymenoptera, Anthophila) due to undefined species diversity, genus-specific barcoding gaps and database errorsJanko Šet, Rok Šturm, Blaž Koderman, Danilo Bevk, Andrej Gogala, Denis Kutnjak, Klemen Čandek, Matjaž Gregorič, 2024, original scientific article Keywords: insect pollinators, wild bees, DNA, biodiversity, databases Published in DiRROS: 19.06.2024; Views: 238; Downloads: 136
Full text (1,11 MB) This document has many files! More... |
960. The activation of iron deficiency responses of grapevine rootstocks is dependent to the availability of the nitrogen formsSarhan Khalil, Rebeka Strah, Arianna Lodovici, Petr Vojta, Federica De Berardinis, Jörg Ziegler, Maruša Pompe Novak, Laura Zanin, Nicola Tomasi, Astrid Forneck, Michaela Griesser, 2024, original scientific article Abstract: Background In viticulture, iron (Fe) chlorosis is a common abiotic stress that impairs plant development and leads to yield and quality losses. Under low availability of the metal, the applied N form (nitrate and ammonium) can play a role in promoting or mitigating Fe deficiency stresses. However, the processes involved are not clear in grapevine. Therefore, the aim of this study was to investigate the response of two grapevine rootstocks to the interaction between N forms and Fe uptake. This process was evaluated in a hydroponic experiment using two ungrafted grapevine rootstocks Fercal (Vitis berlandieri x V. vinifera) tolerant to deficiency induced Fe chlorosis and Couderc 3309 (V. riparia x V. rupestris) susceptible to deficiency induced Fe chlorosis. Results The results could differentiate Fe deficiency effects, N-forms effects, and rootstock effects. Interveinal chlorosis of young leaves appeared earlier on 3309 C from the second week of treatment with NO3 −/NH4 + (1:0)/- Fe, while Fercal leaves showed less severe symptoms after four weeks of treatment, corresponding to decreased chlorophyll concentrations lowered by 75% in 3309 C and 57% in Fercal. Ferric chelate reductase (FCR) activity was by trend enhanced under Fe deficiency in Fercal with both N combinations, whereas 3309 C showed an increase in FCR activity under Fe deficiency only with NO3 −/NH4 + (1:1) treatment. With the transcriptome analysis, Gene Ontology (GO) revealed multiple biological processes and molecular functions that were significantly regulated in grapevine rootstocks under Fe-deficient conditions, with more genes regulated in Fercal responses, especially when both forms of N were supplied. Furthermore, the expression of genes involved in the auxin and abscisic acid metabolic pathways was markedly increased by the equal supply of both forms of N under Fe deficiency conditions. In addition, changes in the expression of genes related to Fe uptake, regulation, and transport reflected the different responses of the two grapevine rootstocks to different N forms. Conclusions Results show a clear contribution of N forms to the response of the two grapevine rootstocks under Fe deficiency, highlighting the importance of providing both N forms (nitrate and ammonium) in an appropriate ratio in order to ease the rootstock responses to Fe deficiency. Keywords: vitis, iron uptake, chlorosis, nitrate, ammonium, RNA-Seq Published in DiRROS: 19.06.2024; Views: 257; Downloads: 111
Full text (9,52 MB) This document has many files! More... |