The metal composition of a group of eneolithic copper artefacts from the Ljubljansko barje (Ljubljana Moor) was determined by ICP-AES analysis. Half of the finds come from ...nineteenth century excavations of prehistoric pile dwellings at Ig and the remaining objects were found on the bed of the River Ljubljanica in the twentieth century. The material has been approximately dated to the fourth and third millennia BC. Analysis showed that all the objects are made of copper with various impurity patterns differing in terms of the concentration ratios of arsenic, antimony, nickel, silver and lead. The majority of the artefacts are of a copper type with dominant antimony, copper with domi-nant arsenic was found only in two artefacts. All artefacts also contain lead and silver as trace elements. The results showed that the classification of the metal composition into the copper types that have been identified in the recent German research by means of multivariate analysis was reasonable.
The within-patch microdistribution and movements of adults of the critically endangered butterfly, Coenonympha oedippus, were studied using mark-recapture data from an isolated patch network, which ...consisted of 8 patches in central Slovenia. The impact of patch characteristics on both parameters was analyzed. Males fly longer distances and spend more time flying than females. The distances and seasonal pattern of male movements were dependent on the patch size, and on the microdistribution and density of freshly emerged (receptive) females. The spatial and temporal pattern of female microdistribution was influenced by vegetation height, the homogeneity of host plant stands and the shading of the ground and/or the lowest parts of herb layer. In the case of near continuous distribution of host plants within a patch, the structure of herb vegetation appears to be the major determinant of adult microdistribution. It affects the dynamics of butterfly emergence and the selection of oviposition sites. The per cent cover of the nectar plant, Potentilla erecta, does not play an important role in butterfly microdistribution.
V izoliranem omrežju osmih habitatnih krp v osrednji Sloveniji smo z metodo markiranja, izpusta in ponovnega ulova raziskovali prostorsko razporeditev in gibanja imagov kritično ogrožene vrste Coenonympha oedippus v habitatni krpi in vpliv značilnosti krpe na oba proučevana parametra. Samci preletavajo daljše razdalje in v dnevni aktivnosti več časa porabijo za let kot samice. Preletne razdalje in vzorci preletavanja samcev v sezoni so odvisni od velikosti krpe ter prostorske razporeditve in populacijske gostote sveže izleglih (receptivnih) samic. Na prostorske in časovne vzorce disperzije samic vplivajo višina vegetacije, homogenost sestoja hranilnih rastlin gosenic in osončenost spodnje plasti zeliščne vegetacije. Če je razporeditev larvalnih hranilnih rastlin v krpi enakomerna in kontinuirana, je struktura zeliščne vegetacije najpomembnejši dejavnik, ki določa disperzijo imagov, saj vpliva na dinamiko izleganja iz bub in izbiro mest za ovipozicijo. Pokrovnost vrste Potentilla erecta, ki je hranilna rastlina odraslih osebkov, ne vpliva na razporeditev odraslih osebkov v krpi.
In September 2010, one of the greatest floods in recent decades affected Slovenia, following intense rain between September 16th and 19th. Members of the Anton Melik Geographical Institute of the ...Scientific Research Centre of the Slovenian Academy of Sciences and Arts made their first terrestrial oblique imaging of the floods on Ljubljansko Barje (the Ljubljana moor) from Sv. Ana hill over Podpec on the September 20th, 2010. The floods on the Ljubljana moor, Radensko polje and Dobrepolje were later also covered with handheld imaging made from helicopter on September 23rd, 2010. Terrestrial imaging was made in the time of the highest waters and the imaging from helicopter when the floods were retreating. The floods on Ljubljana moor around Podpec are presented. Images made with the Canon PowerShot SX10 IS non-metric camera were used. The camera was calibrated afterwards, but the calibration data could not be used directly due to not knowing the parameters of zoom in the time of imaging.The flooding boundary was measured from the non-metric images with the interactive orientation of image on the DEM. The results of interactive orientation of non-metric images made with the photogrammetrically derived DEM with a cell size of 5 m ? 5 m and LiDAR derived DEM with a cell size ofl m* 1 mare presented. The evaluation of the method for the 3D data acquisition is also made.
Geological processes on the Ljubljansko barje basin after the Last Glacial Maximum are known merely on a general level. At few points more detailed circumstances are known, but this information is ...fragmented spatially and temporally. While artefacts from the archaeological sites were studied in detail, the sediments were mostly only imperfectly described. Better understanding of the evolution of the environment requires accurate study of these sediments and buried soils, and detection of evident stratigraphical hiatuses.
S prispevkom se vključujemo v diskusijo o procesu ne-olitizacije, ki se je razvnela v triindvajseti številki Arhea in opozorimo na podobnost v “raziskovalnem” pristopu, ki ga dva udeleženca v ...diskusiji prakticirata tudi pri raziskovanju na Ljubljanskem barju.
Changes of past and present environment of Slovenia are discussed in nine papers, which were written by 21 authors, coming from 14 research organisations. Our aim is to increase multidisciplinary ...communication and cooperation between Slovenian researchers, working in the fields of palaeoecology and ecology. Research topics include: archaeozoology, biology, ecology, geoarchaeology, palynology, nature protection, dendrochronology, archaeobotany, geochemistry, Karst research and geography.
Hydrodynamic aspect of caves Prelovšek, Mitja; Turk, Janez; Gabrovšek, Franci
International journal of speleology,
01/2008, Letnik:
37, Številka:
1
Journal Article
Recenzirano
Odprti dostop
From a hydrological point of view, active caves are a series of connected conduits which drain water through an aquifer. Water tends to choose the easiest way through the system but different ...geological and morphological barriers act as flow restrictions. The number and characteristics of restrictions depends on the particular speleogenetic environment, which is a function of geological, geomorphological, climatological and hydrological settings. Such a variety and heterogeneity of underground systems has presented a challenge for human understanding for many centuries. Access to many underground passages, theoretical knowledge and recent methods (modeling, water pressure-resistant dataloggers, precise sensors etc.) give us the opportunity to get better insight into the hydrodynamic aspect of caves. In our work we tried to approach underground hydrodynamics from both theoretical and practical points of view. We present some theoretical background of open surface and pressurized flow in underground rivers and present results of some possible scenarios. Moreover, two case studies from the Ljubljanica river basin are presented in more detail. The approach and methodology in each case is somewhat different, as the aims were different at the beginning of exploration. However, they both deal with temporal and spatial hydrodynamics of underground waters.
V prispevku predstavljamo del rezultatov raziskovalnega projekta, ki je bil usmerjen v študij poplavne ravnice Ižice na Ljubljanskem barju, v katero sta umeščeni arheološki najdišči Maharski in ...Resnikov prekop. Z LiDAR meritvami površja in neposrednim datiranjem opuščenih rečnih korit dokazujemo, da je najdišče Maharski prekop stalo na rečnem bregu in ne na 'mostiščarskem' jezeru.
The third publication in which an international group of researchers, under management of collaborators of the Institute of Archaeology at the Scientific Research Centre of the Slovenian Academy of ...Sciences and Arts (ZRC SAZU) from Ljubljana, studies problems of pile-dwelling inhabitation of the Ljubljansko barje, introduces results of researches performed at pile-dwelling settlements Stare gmajne, Blatna Brezovica and Veliki Otavnik Ib, i.e. settlements dating to the 2nd half of the 4th millennium BC.
Vpliv načinov gospodarjenja s travišči na ptice gnezdilke Ljubljanskega barja (osrednja Slovenija)
In spite of the extensive drainage works carried out in the bogs of Ljubljansko barje, the area is ...still important for breeding birds, particularly wet meadow species. Existence of these meadows nowadays depends very much on human management, which can be more or less intensive. Lately, more and more wet meadows are being transformed into pastures. The aim of this research was to find out how different grassland management regimes affect breeding birds at Ljubljansko barje. Intensively managed meadows, extensively managed meadows, pastures and litter meadows were compared. As birds were counted by a method adapted to pastures, counts were made from the edge of the plots. From the end of April till mid June 2003, every plot was visited four times in the morning and once during the night. Management intensity of the plot was determined by the beginning and extent of the area being mown or grazed, speed of mowing progress, number of irrigation ditches and proportion of area fertilized. The largest numbers of breeding birds were recorded in litter meadows, slightly fewer in extensively managed meadows and the least in intensively managed meadows. Considering the numbers of breeding birds, pastures were more similar to intensively than to extensively managed meadows. The beginning of mowing, extent of area mown and proportion of fertilised area were in significant negative correlation with density of nesting birds. It turned out that grazing, as practiced in the year of the research, is not suitable for maintaining wet meadows as habitats for grassland birds. The question remains, however, would less intensive grazing be a suitable alternative solution for maintaining conservationally very important wet grasslands at Ljubljansko barje, which would otherwise be abandoned.
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