bluuebunny/crossref_metadata_2025_split huggingface dataset:
Limnological study of Serbian oxbow shaped Lake Srebrno, with special emphasis on the benthic community composition and structure
Authors: Martinovic-Vitanovic Vesna , Ostojic Snezana , Popovic Natasa , Rakovic Maja , Kalafatic Vladimir 
Published: May 2015

AbstractDetailed limnological study of the Lake Srebrno (Serbia) bottom fauna was performed in March 2007. Investigations included qualitative, quantitative, and saprobiological analysis of bottom fauna communities, physical and chemical analysis of sediments and determination of chlorophyll a concentration, as well as saprobic and trophic status analyses. Samples were collected at eighteen sites distributed along a shoreline and in deeper sections of the lake. Twenty taxa from nine macroinvertebrate groups were recorded. Family Chironomidae had the biggest index of participation, the highest species diversity and the largest density of populations in benthocenoses of Lake Srebrno. Faunistic similarity between sites was estimated according to Sorensen’s Quotient of Similarity (QS). The majority of benthocenoses - 56% showed a medium level of faunistic similarity (QS = 21-60%), and 42% of benthocenoses showed a high level of faunistic similarity (QS = 61-100%). The classification of Lake Srebrno based on saprobic and trophic levels was assessed. Saprobic level was in the range from alpha-meso- to poly-alpha-mesosaprobity. The water quality of the lake ranged from class III and between IV and III class. Generally, Lake Srebrno had eutrophic status with the gradation to hypertrophy.
The relations between land surface morphometry and spectral characteristics of ecosystems in the Ukrainian Carpathians
Authors: Mkrtchian Alexander 
Published: May 2015

AbstractSpatial planning in mountainous areas requires careful consideration of relationships between abiotic conditions and various ecosystem properties. While detailed spatial databases of these and also detailed ecological databases built on field data are still lacking for many regions, satellite data are an indispensable source of spatially distributed detailed ecological information. Digital elevation models and multi-spectral images are especially useful for the acquisition of detailed, up-to-date and cheap spatial data. In this study, principal component analysis and canonical correlation analysis were used to reveal the structure of the relationships between the land surface reflectance values in different wavelength ranges and to investigate relationships between the principal components and the set of topographic characteristics and indexes for the study area in the Ukrainian Carpathians. The most important factor that influences the land and vegetation cover structure was found to be elevation, while other factors included a set of topographic characteristics and indices.
Land cover dynamics in western Bieszczady Mts between 19th and 20th century
Authors: Klich Daniel , Gielarek Sylwia , Antosiewicz Magdalena 
Published: May 2015

AbstractThe aim of this paper was to indicate the main directions in cover changes and land use in Western Bieszczady Mts. Two areas differing in altitudes, were taken into analysis: part of Bieszczady Wysokie Mts (for years 1852 and 2004) and Baligrod Forest District area (for years 1938 and 1996). Changes in land cover were estimated based on map overlapping, and using indices of changes. Transformations related to almost 40% of Baligrod Forest District area and insignificantly less in Bieszczady Wysokie Mts. Within the study areas, regions with considerable stability and also regions with intensive changes on vast areas appeared. The origin of differences in the land use of both study areas emerged not only from natural changes, but also from historical, social and economic changes.
Fractal analysis of leaves: are all leaves self-similar along the cane?
Authors: Gazda Anna 
Published: May 2015

AbstractThe fractal dimension can be used to quantify the shape of a natural curve. Curves with similar degrees of irregularity will tend to have the same fractal dimension. The fractal exponent describes the complexity of a shape and characterizes the scale-dependency of the pattern. This article presents an application of the fractal dimension in the analysis of leaves shape. In this paper I attempt to ask question if leaves of blackberry characterized by fractal dimension differ significantly in relation to the leaf ’s position along the cane. The fractal dimension of 49 leaves of blackberry from 8 primocanes, and 53 leaves from 19 lateral canes, from 9 individuals was estimated. The mean of D of a leaf is 1.12. There are no significant differences between D for leaves from two different cane types. Previous studies were focused on measurements of fractal dimension of leaves randomly chosen from one or a few individuals so there was necessity to measure fractal dimension all leaves growing along the same shoot, because usually leaf shape and size change more or less along a shoot. This research confirmed that fractal dimension is much more related to the shape complexity than to the size of leaves.
Molluscan communities in Late Holocene fluvial deposits as an indicator of human activity: A study in Podhale basin in South Poland
Authors: Alexandrowicz Witold Paweł 
Published: May 2015

AbstractThe localities of Late Holocene fluvial sediments in the Podhale basin were subjected to malacological analysis. Two types of mollusc communities were found in these formations. The first type is characterized by a high proportion of species typical of open environments such as the zones of wide valleys. The predomination of shade-loving taxa is typical of the second type which is mainly associated with narrow, V-shaped type valleys. Malacological analysis allowed characterization of these communities and reconstruction of environmental changes over the last few hundred years. Particular attention was paid to the reconstruction of the history of human settlement in the Podhale region and its impact on the transformation of the environment. This impact resulted in massive deforestation and the introduction of wide-scale farming and pastoral practices. Application of this malacological analysis enabled the determination of the anthropogenic pressures, and changes in their intensity, over the last few hundred years.
Development of soil parameters and changing landscape structure in conditions of cold mountain climate (Case Study Liptovsk Á Teplička)
Authors: Fazekašová Danica , Boltižiar Martin , Bobuľská Lenka , Kotorová Dana , Hecl Ján , Krnáčová Zdena 
Published: May 2015

AbstractFazekašova D., Boltižiar M., Bobuľska L., Kotorova D., Hecl J., Krnačova Z.: Development of soil parameters and changing landscape structure in conditions of cold mountain climate (case study Liptovska Teplička). Ekologia (Bratislava), Vol. 32, No. 2, p. 197-210, 2013.Soil physical, chemical and biological properties and the content of heavy metals were investigated between 1997 and 2010 and changing landscape structure was evaluated for years 1948-2010 under production conditions in the investigated area Liptovska Teplička (48° 57´ N; 20° 05´ E), situated in the marginal region of north-eastern Slovakia. Research showed that soil physical properties get adjusted after a long-term application of ecological farming system and the measured values were stabilised. High doses of organic fertilizers had positive effect on soil fertility, and thus indirectly on maintaining soil pH, available nutrients content and accumulation of humus in soil. The values of soil enzymes activities changed minimally during the research period. At the same time, it was proven that increasing the content of soil organic matter promotes natural protection of soil enzymes. This study underscores the importance of long-term, quantitative soil monitoring in determining the changes in agricultural land and ecosystem processes over time. Statistically significant effect of experimental year on all observed soil parameters was confirmed by analysis of variance. Effect of experimental locality, with the exception of pH/CaCl2, Cox and Nanorg, on other soil parameters was also statistically significant. This area represents a specific mountain grassland-arable landscape with conservation of traditional agriculture. The results of this paper also analyse landscape structure changes by using the historical maps and aerial photographs of the past 160 years.
Safety Assessment for Spatial Development
Authors: Řehák David , SikorovÁ Kateřina , Senovský Pavel 
Published: May 2015

AbstractRehak D., Sikorova K., Senovsky P.: Safety assessment for spatial development. Ekologia (Bratislava), Vol. 32, No. 2, p. 220-241, 2013.The article deals with the problems of operable safety assessment for spatial development to promote the preventive protection of population, engineering infrastructure and the environment against negative effects of spatial development. At present, many methods available for semi-quantitative risk analysis exist, but there is no method completely suitable for assessment of risks associated with spatial development. This is why a new method - Spatial Development Impact Assessment, which is based philosophically on the Fire & Explosion Index, Hazard & Vulnerability Index and Hazard & Impact Index - is presented in the article. The article describes the main tools of this method, namely assessment process algorithm, catalogue of hazard and asset groups and spatial development impact matrix. It demonstrates, by a case study on the safety assessment for spatial development using an online software tool developed for this purpose, the application of the method.
Invasive plant species in the three microregions of Nitra region, South-west Slovakia
Authors: Pauková Žaneta 
Published: May 2015

AbstractPaukova Ž.: Invasive plant species in the three microregions of Nitra region, south-west Slovakia. Ekologia (Bratislava), Vol. 32, No. 2, p. 262-266, 2013. Alien plant species were recorded by field survey in three selected microregions (submontane in district Zlate Moravce, hilly in district Nitra and lowland in districts Nove Zamky) in Nitra region, SW Slovakia in 2011. In the microregions totally 19 invasive neophytes were recorded. The most frequent and abundant species were the following: Ailanthus altissima, Ambrosia artemisiifolia, Conyza canadensis, Fallopia x bohemica, Helianthus tuberosus, Iva xanthiifolia, Negundo aceroides, Robinia pseudoacacia, Solidago canadensis and Stenactis annua. On the basis of the data we can preliminary conclude that the number of species and the number of localities in the southern lowland microregion were almost twice higher than those in the northern hilly region.
Applying landscape ecological principles in sustainable forest management of the floodplain forest in the temperate zone of Europe
Authors: Machar Ivo 
Published: May 2015

AbstractMachar I.: Applying landscape ecological principles in sustainable forest management of the floodplain forest in the temperate zone of Europe. Ekologia (Bratislava), Vol. 32, No. 4, p. 369-375, 2013.European floodplain forests of the temperate climatic zone are an example of an ecosystem in the cultural landscape characterized by an exceptionally high biodiversity. In this usually heavy deforested landscape of the Central and South European river floodplains, which are subjected to intensive agricultural use, the preserved ecosystems of floodplain forests represent important refuges for biotic biodiversity and are invaluable for the ecological landscape stability of the entire floodplain and the wider river basin. Unlike other Central European communities, whereby constant ecological conditions of habitats tend to be preserved even upon changes in ecosystem, the floodplain forests are characterized by a long-term continuous development of ecotopes, conditioning the complex interconnected succession series of ecosystem. The ecological floodplain phenomenon is created by fluvial landscape processes and the conservation of the natural development dynamics of the said fluvial landscape processes is essential for its protection. The landscape structure of floodplain forests is significantly affected by forest management measures, including regeneration methods, silvicultural measures and felling. Floodplain forest management radically affects the biodiversity of the given ecosystems which are listed among habitats of European concern in the Natura 2000 network. Since understanding of the biological nature of forest ecosystems is essential for landscape and ecological planning and sustainable forest management, it is imperative to study ecological processes taking place in the various floodplain forest biotopes in order to be able to define the principles of their management. This article aims to contribute to the process of formulating principles of biodiversity protection and the management strategies for floodplain forest ecosystems, while applying some theories and methods of landscape ecology. The Results section of the article comes in the form of case studies for each topic and draws on original data which were published in the scientific journals or presented at scientific conferences (see References). Some of the presented case studies focus on the Protected Landscape Area Litovelske Pomoravi.
Douglas-fir provenance phenology observations
Authors: Lavadinović Vera , Isajev Vasilije , Rakonjac Ljubinko , Popović Vladan , Lučić Aleksandar 
Published: May 2015

AbstractLavadinović V., Isajev V., Rakonjac L., Popović V., Lučić A.: Douglas-fir provenance phenology observations. Ekologia (Bratislava), Vol. 32, No. 4, p. 376-382, 2013.Introduction of species involves adaptation, productivity and success in new types of environmental conditions. The introduction also includes confirmation to bring in only species which are superior on their natural habitat. In Canada and western North America, Douglas fir (Pseudotsuga menziesii/Mirb./Franco) is one of the most ecologically and economically value trees. In Europe, New Zealand, Australia and Chile, Douglas fir is important as an exotic fast-growing timber species. Douglas fir has one of the widest natural ranges of any tree species, extending from the Pacific Coast to the eastern slope of the Rocky Mountains and from 19°N in Mexico to 55°N in western Canada. In Serbia, from the original seeds introduced from British Columbia and Canada, the experimental Douglas-fir provenance is established in a few locations. One of the main dangers for the Douglas fir is its sensitivity to the occurrence of late frost in spring and early occurrence of frost in the autumn. The aim of the paper is to test the effect of environment on the expression of Douglas-fir seed transfer. Bud burst phenology is closely related to genecology of introduced species. Douglas fir is susceptible to cold climate and most of its genetic structure and ability depends on its ecological adaptability. In order to avoid errors introduction of Douglas-fir provenances that are sensitive to the occurrence of extreme temperature, applied are researching for buds phenological changes Douglas fir, as an introduced species, has to be tested at the provenance level before its introduction to the new sites in Serbia.
Infrared Images and Land Cover in the Past
Authors: Ždímal Václav 
Published: May 2015

AbstractŽdimal V.: Infrared images and land cover in the past. Ekológia (Bratislava), Vol. 32, No. 4, p. 383-387, 2013.Czech landscape is an old residential area used by humans since ancient times. At one point, we can follow the traces of human activity from different periods and natural changes. Land cover of one location can change several times. The most important reason is meandering and subsequent straightening of rivers, deforestation, relocation and change in soil layers. These changes in the past affect the present management, and it is important to identify them. A suitable tool for the determination of different sites is remote sensing in the infrared spectrum, which monitors changes in the vegetation, with the support of archival materials. These changes in vegetation are statistically significant and distinct sites with different histories of others. After identifying the different places, one can search the archive materials to know what was the land cover in the past. The following archival materials have been used: maps II and III, military mapping, basic maps and other maps and historical aerial photographs. These images document the landscape before collectivization and the reclamation of the land, which dynamically changed the landscape cover. The studied area was documented by other aerial photographs from other time periods between 1959 and 1989 and mainly infrared images from present were used as the main basis for determining the development of land cover. A comparative analysis of land cover shows the increases and decreases in agricultural land, changes in communication line elements, the impact of new methods of land use, erosion control restoration measures, changes in retention capacity, losses and increase forest, comparing the legal and actual status of the forest boundaries and their changes over time and changes in the built areas.
Structure and physical–chemical properties of humic aсids of oligotrophic peat bog of arkhangelsk region
Authors: Kuznetsova Irina , Bogolitsyn Konstantin , Larionov Nikolay , Boytsova Tatiana , Palamarchuk Irina , Aksenov Andrew 
Published: May 2015

AbstractThe article presents data on the elemental and functional composition of humic acids, their molecular weight characteristics, physical, chemical and acid-base properties. The sorption properties of humic acids towards Cd2+ and Pb2+ are studied. The relationship between the polyelectrolyte nature of humic acids and their sorption capacity is revealed.
Production-ecological analysis of herb layer in the softwood floodplain forests formed after the gabčíkovo waterwork construction and their characteristics
Authors: Vojtková Jana , Minarič Peter , Kollár Jozef 
Published: May 2015

AbstractThis paper is focused on phytocoenological characteristics and production analysis of herbaceous layer biomass of the softwood floodplain forests (Salici-Populetum (R. Tx. 1931) Meijer Drees 1936 association) and their phytocoenological characteristics. The sampling site was located in the young stands, which were formed after the Gabčíkovo Waterwork construction in 1992. Redirection of the major ratio of flow into the supply channel has caused essential decrease of water level in the old Danube riverbed. As a result of this, new bare sites have appeared having character of pioneer habitat. In the process of primary succession, new softwood floodplain forests have formed here within a few years. These stands are the subject of the study presented in this paper. We estimated herb layer biomass using indirect sampling modified for non-repeated field measurements (Kubíček, Brechtl, 1970). Total biomass of herbaceous layer was estimated to be 5577 kg ha
Comparison of modern and traditional methods of soilsorption complex measurement : the basis of long -term studies and modelling
Authors: Kučera Aleš , Šikl Jaromír , Oulehle Filip , Šamonil Pavel , Marosz Karel , Hleb Ruslan , Houška Jakub , Hruška Jakub 
Published: May 2015

AbstractThis paper presents the correlations between two different analytical methods of assessing soil nutrient contents. Soil nutrient content measurements measured using the flame atomic absorption spectrometry (FAAS ) method, which uses barium chloride extraction, were compared with those of the now-unused Gedroiz method, which uses ammonium chloride extraction (calcium by titration, magnesium, potassium and sodium by weighing). Natural forest soils from the Ukrainian Carpathians at the localities of Javorník and Pop Ivan were used. Despite the risk of analysis errors during the complicated analytical procedure, the results showed a high level of correlation between different nutrient content measurements across the whole soil profile. This allows concentration values given in different studies to be linearly recalculated on results of modern method. In this way, results can be used to study soil’s chemical changes over time from the soil samples that were analysed in the past using labour-intensive and time-consuming methods with a higher risk of analytic error.
Effect of afforestation of agricultural soils and tree species composition on soil physical characteristics changes
Authors: Vopravil Jan , Podrázský Vilém , Khel Tomáš , Holubík Ondřej , Vacek Stanislav 
Published: May 2015

AbstractThis paper deals with the evaluation of the effect of afforestation of previously arable land to soil characteristics changes. One of the main aims was to evaluate the effects of each forest species on the soil structure quality after afforestation. Soil samples were taken at two climatically distinct subregions within the Czech Republic. Based on the different site conditions, two study sites were chosen at each locality for a total of four research sites. Detailed soil survey and basic forest stand inventories were conducted at all four sites. The first locality was established in the Rychnov nad Kněžnou district in the Protected Landscape Area of the Orlické mountains (soil type a Haplic Cambisol). The second locality was established in the Prague-East district (soil type a Haplic Cambisol and a Haplic Stagnosol). Afforestation had a positive influence on the soil physical characteristics which are important for the maintenance of soil stability. Forest cover has a major influence on increasing the soil porosity, by decreasing the reduced bulk density and increasing capillary and gravitational pores, which is crucial. Afforestation was also found to be positively related to increases in soil organic matter content in different forms, both stable and unstable, and tendency of considerable soil organic matter accumulation not only in the layer of surface humus but also in the entire soil profiles of the research sites. The main contributor to soil improvement after afforestation is the formation of stable soil aggregates. This is typical also for spruce and pine cover.
Vegetation of Humic Lakes in Relation to their Trophic State
Authors: Ejankowski Wojciech , Iglińska Anna M. 
Published: May 2015

AbstractEjankowski W., Iglińska A.M.: Vegetation of humic lakes in relation to their trophic state. Ekológia (Bratislava), Vol. 33, No. 2, p. 160-170, 2014.The vegetation of selected 24 humic lakes in Poland was studied to establish whether there was a link between the lakes’ vegetation and their trophic state. Based on literature data and field studies, the lakes were distinguished into two groups with regard to plant communities in the lakes and catchment basins. They were identified as dystrophic (DL) and humoeutrophic (HL) lakes according to their chemical and biological parameters. The two lake groups differed in terms of macrophyte structure: nymphaeids were common in DL, whereas helophytes in HL. The massive development of elodeids was also observed in HL. Vegetation in the catchment basins was mesotrophic in HL (Caricion lasiocarpae Vanden Bergh. ap. Lebrun et al., 1949), whereas in case of extremely nutrient-poor habitats in DL oligotrophic vegetation was found (Rhynchosporion albae Koch 1926 and Oxycocco-Sphagnetea Br.-Bl. et. R .Tx. 1943). The regionally determined variability of humic lakes in Poland was verified positively. Potential dystrophy indicators are discussed in this paper.