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Least adder's-tongue (Ophioglossum lusitanicum L.) in Croatia - distribution, ecology and conservation
Slavko Brana, Nina Vuković, Mitja Kaligarič, 2014, izvirni znanstveni članek

Opis: The presence of the least adder's tongue (Ophioglossum lusitanicum) in Croatia is sparsely documented in scientific literature, with only a few records to date. After findings from the 19th century, the species was not confirmed in the field for a whole century, and was consequently considered extinct in the Croatian flora. It has been recently confirmed in southern Istria (Croatia), in habitats with moderate anthropogenic impacts.
Ključne besede: Croatia, distribution, endangered species, flora, Istria, Ophioglossum lusitanicum
Objavljeno v DKUM: 28.03.2017; Ogledov: 1018; Prenosov: 400
.pdf Celotno besedilo (304,26 KB)
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Contribution of non-troglobiotic terrestrial invertebrates to carbon input in hypogean habitats
Tone Novak, Franc Janžekovič, Saška Lipovšek Delakorda, 2013, izvirni znanstveni članek

Opis: Eleven of the most important terrestrial invertebrate species in Slovenian caves were analyzed for differences in their fresh and dry biomass, energy content and carbon bulk during winter. These data were combined with the species abundance in 54 caves and adits in order to estimate their organic carbon bulk and carbon input into these habitats. In Central European caves, Troglophilus cavicola, T. neglectus, Faustina illyrica, Amilenus aurantiacus and Scoliopteryx libatrix are the most important vectors of carbon between the epigean and hypogean habitats. In contrast to the general assumption, carbon total contribution to caves via dead bodies is only 0.15% of total migratory biomass, and it is not directly available to troglobionts because of infection with entomopathogenic fungi. In winter, together with predated migratory specimens, carbon input does not exceed 0.3% of the total migratory biomass. This situation should be carefully examined in every karstic region inhabited by distinctive fauna.
Ključne besede: biomass, carbon flux, caves, non-troglobiotic species, organic carbon, respiration
Objavljeno v DKUM: 21.12.2015; Ogledov: 1309; Prenosov: 83
URL Povezava na celotno besedilo

Last remnants of riparian wooded meadows along the middle Drava River (Slovenia) : species composition is a response to light conditions and management
Sonja Škornik, Nina Šajna, Branko Kramberger, Simona Kaligarič, Mitja Kaligarič, 2008, izvirni znanstveni članek

Opis: In the present study, we investigated the species richness and species composition in relation to light and management regime in remnants of wooded meadows within the riparian forests along the middle Drava River in Slovenia. 41 plots of still managed and, at different time periods (<5 yrs, 5-15 yrs, >15 yrs), abandoned riparian wooded meadows (RWM) were sampled. In addition to vegetation relevés, light intensity (PAR) was also measured in plots. Within the still-managed RWM, two floristically distinct types were recognized using TWINSPAN analysis: meadow-like and forest-like. Light intensity differed significantly between types. The CCA of active RWM showed a significant relation between species composition and light conditions. The number of species per relevé on active RWM was negatively correlated with light intensity - in contrast to North European wooded grasslands. This could be explained by the influence of species-rich riparian hornbeam forests that contribute many understorey species, in contrast to naturally mesotrophic meadows. CCA of both active and abandoned RWM demonstrated that light was a good predictor of RWM species composition and that abandonment caused profound changes in floristic composition. The species turnover during succession was more pronounced in less shaded meadow-like RWM where more light-requiring (grassland) species occurred. Species richness was the highest in active forest-like RWM. There were no significant differences in species richness between active meadow-like RWM and groups of abandoned RWM. The remains of riparian forests stretching along the flood plains of Central and Eastern Europe are considered one of the most natural ecosystems in the prevailing agricultural landscape. But naturalness could be in many cases only the consequence of abandonment of ancient land-use practices, like grazing of livestock, cutting between the trees, litter collecting, etc. Examination of the middle Drava River in Slovenia suggests the need to recognize the remains of ancient cultural landscape.
Ključne besede: botany, meadows, wooded meadows, Drava river, species richness, abandonment
Objavljeno v DKUM: 07.06.2012; Ogledov: 1485; Prenosov: 67
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Elevational diversity of reptiles on two Dinaric mountains
Boris Kryštufek, Franc Janžekovič, Nataša Režek Donev, 2008, izvirni znanstveni članek

Opis: Elevational pattern in reptilian species richness and species turnover was studied on two Dinaric mountains along the eastern Adriatic coast: northern Mt. Velebit and Mt. Biokovo. Both mountains had similar numbers of species (20 and 22, respectively) and showed a gradual decline in species richness with increasing elevation. Lizard species richness was less dependent on elevation than that of snakes. Pattern of species turnover among 200 m elevational intervals peaked at high elevations in Mt. Velebit and at mid-elevations in Mt. Biokovo. Two elevational zones (0-400 m and 1400-1600 m) contained 100% of a local species pool in Mt. Velebit and 91% in Mt. Biokovo. Effective conservation of reptilian species richness in the Dinaric Alps should thus focus on extreme altitudinal zones.
Ključne besede: zoology, reptiles, Dinaric mountains, Velebit, Biokovo, Mediterranean mountains, elevational gradient, species richnes, species turnover
Objavljeno v DKUM: 07.06.2012; Ogledov: 1736; Prenosov: 128
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Case study of the sonochemical decolouration of textile azo dye Reactive Black 5
Simona Vajnhandl, Alenka Majcen Le Marechal, 2007, izvirni znanstveni članek

Opis: The decolouration and mineralization of reactive dye C.I. Reactive Black 5, a well-known representative of non-biodegradable azo dyes, by means of ultrasonic irradiation at 20, 279 and 817 kHz has been investigated with emphasis on the effect of various parameters on decolouration and degradation efficiency. Characterization of the used ultrasound systems was performed using calorimetric measurements and oxidative species monitoring using Fricke and iodine dosimeter. Experiments were carried out with low frequency probe type, and a high-frequency plate type transducer at 50, 100 and 150 W of acoustic power and within the 5-300 mgžL initial dye concentration range. Decolouration, as well as radical production, increased with increasing frequency, acoustic power, and irradiation time. Any increase in initial dye concentration results in decreased decolouration rates. Sonochemical decolouration was substantially depressed by the addition of 2-methyl-2-propanol as a radical scavenger, which suggests radical-induced reactions in the solution. Acute toxicity to marine bacteria Vibrio fischeri was tested before and after ultrasound irradiation. Under the conditions employed in this study, no toxic compounds were detected after 6 h of irradiation. Mineralization of the dye was followed by TOC measurements. Relatively low degradation efficiency (50% after 6 h of treatment) indicates that ultrasound is rather inefficient in overall degradation, when used alone.
Ključne besede: textile industry, wastewater treatment, textile dyeing, reactive dyes, azo dyes, decoloration, ultrasound, degradation, decoloration kinetics, oxidizing species
Objavljeno v DKUM: 01.06.2012; Ogledov: 1896; Prenosov: 91
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