Melita Mihaljević

Melita Mihaljević
University of Osijek | UNIOS · Department of Biology

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29
Publications
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Introduction
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Publications

Publications (29)
Article
Full-text available
The purpose of this study was to determine the biogas potential of biomass produced by microbiotic communities developed under natural conditions in freshwater systems such as ponds incorporated into agricultural landscapes. Natural communities of microalgae were collected from a small eutrophicated pond where dominant species were euglenoids (Lepo...
Article
Full-text available
Intensive human activities have resulted in a critical reduction of grasslands in Croatia, one of the richest Europian countries in terms of biodiversity. Sub-Pannonic steppic grasslands are very rare, only few occur in the continental part of Croatia and most of them are protected as NATURA 2000 sites. We studied vascular flora of the Sub-Pannonic...
Article
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The diversity of early spring vascular flora was studied in the Sub-Pannonic steppic grassland in the village of Bilje, north eastern Croatia. In all, 109 plant taxa within 35 families were found. The highest number of taxa belongs to the families Poaceae, Fabaceae, Asteraceae, Caryophyllaceae, Lamiaceae and Rosaceae. Specific habitat conditions, c...
Article
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Coarse woody debris (CWD) are an important structural feature of many aquatic ecosystems. This study focused on the relationships between nematode colonization and microphytic community structure on CWD. In situ investigations were performed using white willow branches introduced into the floodplain lake, a part of the large natural floodplain in t...
Article
Full-text available
Disturbance event-driven changes in periphytic algal communities were studied in a Danubian floodplain using artificial substrata (glass slides). The hydrological regime of the river-floodplain system strongly influenced the physical and chemical environment of the investigated lake. Directional changes in the algal communities, demonstrated by the...
Article
The traditional taxonomic approach is today being supplemented by ecological classifications of phytoplankton following the concepts of functional groups (FG), morpho-functional groups (MFG), and morphology-based functional groups (MBFG). In this study, we compared the potential of all three concepts in the evaluations of phytoplankton changes in t...
Article
Current efforts to yield an appropriate method that would simplify the use of phytoplankton in the ecological evaluation of freshwaters resulted in different approaches based on clustering phytoplankton organisms. In this study, we applied the morphology-based functional group (MBFG) concept to determine the spatial changes of phytoplankton in the...
Article
Temporal changes in autotrophic periphyton (algae and cyanobacteria) in relation to the colonization of Dreissena polymorpha, an invasive species, were investigated in situ using artificial substrata (glass slides) from April to August of 2008 in a Danubian floodplain. The colonization of cyanobacteria and planktonic diatoms firmly attached to the...
Article
During the past decade, basic hydrological conditions of a floodplain lake in the middle Danube section have been altered with long-lasting extremely high flooding. The objective of the paper is to show the effectiveness of the functional approach to explain phytoplankton changes associated with hydrological events. Intensity and duration of floodi...
Article
In this research, we aimed to find out how the differences in hydrological connectivity between the main river channel and adjacent floodplain influence the changes in phytoplankton community structure along a river-floodplain system. The research was performed in the River Danube floodplain (Croatian river section) in the period 2008-2009 characte...
Conference Paper
The survey of herbaceous hosts of Grapevine virus B (GVB) was performed on 24 herbaceous species. Four plants of each species were separately mechanicaly inoculated with two GVB isolates: PM and MA. One month after inoculation success was checked by ELISA. Successfull transmission was confirmed in Nicotiana cavicola and N. occidentalis. Two plants...
Article
Full-text available
The changes in composition and abundance of phytoplankton and periphytic algae during the successions of dry and flood phases were investigated in an eutrophic Danubian floodplain lake during the summer-autumn period. The in-lake conditions (high nutrient concentration, high water temperature) during the dry phase in summer stimulated an increase o...
Article
Full-text available
The colonization of periphytic algae in a temperate floodplain was studied in Lake Sakadaš, a part of a fluvial floodplain along the Danube River. An in situ investigation, using artificial substrata, was started after extremely high spring flooding and was carried out during long-lasting summer floods (July–August 2010). The physical and chemical...
Article
The colonization process of periphyton algae was studied in the Danubian floodplain (Lake Sakadas, Nature Park Kopacki Rit, Croatia) under variable spring hydrological conditions. We used an in situ experiment, with artificial substrata, to examine changes in the algal community composition during the early phase of periphyton formation. A few floo...
Article
In the past decade, extreme hydrological events were expressed with extreme droughts and floods in temperate regions. The aim of this paper is to explain how such changes in hydrology can influence cyanobacterial populations in floodplain ecosystems. We therefore analyzed a 6-year (2003-2008) study of the phytoplankton in the Kopački Rit floodplain...
Article
The influence of extreme floods from the River Danube in 2006 on the species composition and vertical distributions of phytoplankton was studied in a shallow floodplain lake, Lake Sakadaš (Kopački Rit Nature Park, Croatia) which in the last few decades was in a turbid state characterised by high phytoplankton concentrations. As a consequence of ext...
Article
Full-text available
Riverine wetlands are key territories for the conservation of biodiversity on a river basin scale. The analysis of available data can offer valuable information underlining the importance of recent investigations for the researches in the field of wetlands biodiversity. Data collected for five vertebrate groups (fish, amphibians, reptiles, birds an...
Article
There are several conflicting hypothesis that deal with the influence of flooding in the natural river–floodplain systems. According to the Flood Pulse Concept, the flood pulses are not considered to be a disturbance, while some recent studies have proven that floods can be a disturbance factor of phytoplankton development. In order to test whether...
Article
Full-text available
The algal growth potential (AGP) in water samples of the Danube wetland waters (1388–1426r. km) as well as the effect of nitrogen (in final concentration of 0.16gl−1) and phosphorus enrichment (in final concentration of 0.02gl−1) on the AGP was investigated by miniaturized bioassay method. Values of the total biomass of Chlorella kessleri up to the...
Article
ackground and Purpose: The Danubian flood area in northeastern Croatia (Baranja Region) covers approximately 53 000 ha, of which the protected area of the Nature Park Kopački rit includes approx. 23 000 ha. Phases of floods and droughts are the main characteristic of floodplain aquatic environments. The aim of this paper is to compare the microphyt...
Article
Background and Purpose: The primary objective of this investigation was to examine the effects of nutrient enrichment, by using miniaturized algal bioassay, oil the growth of the unicellular green alga Chlorella kessleri in order to make a comparative evaluation of the trophic level and productivity of tuater ecosystems of the Danube (1426-1388):r....
Article
The unicellular green alga Chlorella kessleri FOTT et NOV. is suitable for the evaluation of the AGP by the miniaturized bioassay method in order to evaluate the trophic level and the productivity and toxicity of water ecosystems. The aim of this paper is to compare in situ phytoplankton growth with the influence of the addition of nitrates and pho...
Article
Background and purpose: Lake Sakadas, the deepest lake in the complex wetland ecosystem of the Kopacki rit Nature Reserve, was under the influence of untreated waste, waters during the 1980s. The improvement of water quality and decrease in eutrophication were registered in the period from its revitalization (controling of waste waters and sediment...
Article
Full-text available
The Southern lake is shallow (deep up to 4 meters) artificial lake with the ackerage of 6. 25. It is situated within the city of Osijek. Its reconstruction began in 1995, after it has been polluted for many years. The results of, hydrobiological examination show the basic ecological characteristics of the Southern lake: high transparency, great qua...
Article
Full-text available
The massive development of bluegreen algae (Cyanophyta/Cyanobacteria), the so--called water bloom, is a frequent phenomenon in fishpond ecosystems. This study analyses water bloom development in three carp fishponds owned by a fishbreeding company at Donji Miholjac (Croatia), where one-year-old carps (Cyprinus carpio) , were bred in defferent fishs...