Geomorphologia Slovaca et Bohemica   
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Geomorphologia Slovaca et Bohemica
1/2018

Content/Obsah

MILAN LEHOTSKÝ - MILOŠ RUSNÁK - ANNA KIDOVÁ - JOZEF DUDŽÁK: 
Preface to 40th IAD conference papers
   
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JÜRG BLOESCH:
Danube under pressure - a personal analysis 
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EMÍLIA MIŠÍKOVÁ ELEXOVÁ - MARGITA LEŠŤÁKOVÁ - SOŇA ŠČERBÁKOVÁ - MATÚŠ HAVIAR:
Slovak Danube River assessment based on intercalibrated biological method for macroinvertebrates 
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EUGENIA CIOACĂ - MARIAN MIERLĂ - MIHAI DOROFTEI - MIHAI MARINOV - ALEXANDRU DOROŞENCU - VASILE ALEXE - GABRIEL LUPU - AUREL NĂSTASE - MIHAELA TUDOR - ORHAN IBRAM:
Ecological restoration of the Danube Delta wetland fragmented ecosystems. Şontea-Fortuna area case study 
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OLIVIA CIOBOIU - CARMEN-MĂDĂLINA CISMAŞIU:
Impact of eutrophication and industrial pollution on biodiversity evolution of the lacustrine ecosystems from the Romanian Sector of the Danube River 
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JASMINA KRPO-ĆETKOVIĆ - MAJA PRICA - SRĐAN SUBOTIĆ - MIROSLAV NIKČEVIĆ - BRANISLAV MIĆKOVIĆ:
Length-weight relationship and condition of three goby species in the Danube River near Slankamen (Serbia) 
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SRĐAN SUBOTIĆ - ŽELJKA VIŠNJIĆ-JEFTIĆ - JASMINA KRPO-ĆETKOVIĆ - MIRJANA LENHARDT:
Age, growth, and length-weight relationship of common nase (Chondrostoma nasus) in the Danube River near Belgrade (Serbia) 
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IONELIA CLAUDIA GOGA - OANA MITITELU-IONUŞ:
Integrating protected area management and Ichthyo-faunal status for the Adunaţii de Geormane Lake (South-western Romania) 
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MARTIN T. DOKULIL:
Climate warming affects water temperature in the River Danube and tributaries – present and future perspectives 
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SPRAVODAJCA ASG PRI SAV 2017
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Abstracts/Abstrakty

Milan Lehotský, Miloš Rusnák, Anna Kidová, Jozef Dudžák:
Preface to 40th IAD conference papers
Geomorphologia Slovaca et Bohemica, 18, 2018, 1, 7 - 8.
7 refs.

The current volume of Geomorphologia Slovaca et Bohemica comprises 7 contributions presented on the 40th Conference of the International Association for Danube Research (IAD) on 2 – 6 July 2018 in the Smolenice castle, Slovakia. The main aim of the conference, entitled Danube - a lifeline governed by mul-tiple uses, pressures and a multitude of ecosystem services was provide a forum for the long-term multi-disciplinary research activities and discussions on various topics which reveal the importance of different types of watercourses for the Danube Basin, as well as the interlinkage with the marine area, highlighting the need to protect the biodiversity of this unique area. The International Association for Danube Research was founded in 1956 with the aim of promoting and coordinating activities in the fields of limnology, water management, water protection and sustainable development in the Danube River basin.
Key Words: IAD, conference, Smolenice, Danube, ecosystem services

 

Jürg Bloesch:
Danube under pressure - a personal analysis
Geomorphologia Slovaca et Bohemica, 18, 2018, 1, 9 - 15.
2 figs., 1 tab., 32 refs.

Key pressures in the Danube River Basin (DRB) caused by human activities are listed and updated. A list of principles to be applied by water managers and politicians are given and explained to ensure implemen-tation of measures to prevent or mitigate human impacts to river ecosystems. Key examples in the DRB are presented in more detail, encompassing navigation (Bala Branch, Green Corridor), hydropower (Iron Gate dams), flood protection in the Lower Danube (hydromorphological assessment and sediment balan-ce). Major conclusions are: The difficult process of public participation and major infrastructure projects were and still are biased towards users and economic interests, and it is hard to protect aquatic and terrestrial ecosystems. Science must provide safe facts on ecosystem function, environmental NGOs as observers in the ICPDR must further influence large infrastructure projects, and in the long term a para-digm change is inevitable to break the primacy of economy.
Key words: Human activity, science, ecosystem function, water management, scaling

 

Emília Mišíková Elexová, Margita Lešťáková, Soňa Ščerbáková, Matúš Haviar:
Slovak Danube River assessment based on intercalibrated biological method for macroinvertebrates
Geomorphologia Slovaca et Bohemica, 18, 2018, 1, 16 - 22.
4 figs., 1 tab., 13 refs.

With respect to the international and transboundary character of the Danube River, its water quality has been regularly monitored for a long time period. Several studies have dealt with macroinvertebrates of its Slovak reach. In connection with the EU WFD multimetric approach was adopted within ecological status (ES) assessment in natural water bodies. Its main principle is a comparison with reference conditions. Slovak Republic developed WFD compliant classification schemes for ES assessment, based on selected stressor specific metrics depending on Slovak river typology. The Danube River, categorized as special subtype of Very large river within Pannonian Lowland ecoregion, was subdivided to four water bodies – two natural and two heavily modified. This new approach was applied since 2007. The first Slovak river basin management plan (2009) comprised evaluated data of years 2007 and 2008, which were used in Intercalibration exercise of Very large rivers starting from 2009. It was a process of intercomparison of the biological assessment methods for macroinvertebrates within relevant rivers and water bodies. The upper section of the Danube River Slovak river reach fell into good status while the most of it was evaluated within moderate status.
Key words: Danube River, intercalibration, macroinvertebrates, ecological status, WFD

 

Eugenia Cioacă, Marian Mierlă, Mihai Doroftei, Mihai Marinov, Alexandru Doroşencu, Vasile Alexe, Gabriel Lupu, Aurel Năstase, Mihaela Tudor, Orhan Ibram:
Ecological restoration of the Danube Delta wetland fragmented ecosystems. Şontea-Fortuna area case study
Geomorphologia Slovaca et Bohemica, 18, 2018, 1, 23 - 31.
6 figs., 2 tabs., 20 refs.

The Danube River sediment transport leads to alluvial sedimentation of the Danube Delta Biosphere Re-serve inner hydro-graphical network which, in some upstream zones, is high. As a result of this fluvial process, wetland ecosystems get fragmented due to their disconnection from the main channels, especially, in the Danube River low water level condition. This hydrological condition lasting 2-3 months in the year lead to a negative impact on flora and fauna species. In order to improve and maintain an optimum water flow regime inside the aquatic ecosystems, ecological restoration is performed. Thus, fragmented migra-tion routes of wild species are restored and their feeding and breeding conditions are improved. The paper presents the ?ontea-Fortuna zone ecological restoration case study. As main action, three secondary chan-nels have been subject to dredging works. Channels morphology has been reshaped and the bottom eleva-tion from about + 1.20 m a. s. l. reached post-restoration state - 1.50 / - 2.00 m a. s. l. Within the study area, the 7 wetland habitat types and 1,116 wild flora and fauna species have been studied and their pre and post-restoration state were presented in this paper to emphasize the improvements as a result of eco-logical restoration (a prerequisite measurement for biodiversity conservation and protection).
Key words: wetland fragmented ecosystems, ecological restoration, Danube Delta

 

Olivia Cioboiu, Carmen - Mădălina Cismaşiu:
Impact of eutrophication and industrial pollution on biodiversity evolution of the lacustrine ecosystems from the Romanian Sector of the Danube River
Geomorphologia Slovaca et Bohemica, 18, 2018, 1, 32 - 38.
3 figs., 2 tabs., 15 refs.

The construction of a 1,158 km long dike on the Romanian course of the Danube River led to the disap-pearance of more than 400,000 hectares of lakes, ponds, marshes. The Danube River was partially diked between 817 and 665 km, and its floodplain is characterized by structural and functional diversity of lacus-trine ecosystems. This sector, covering 56,425 ha, is a sample of the former floodplain, which preserves biocoenotic structures specific to wetlands. Eutrophication is one of the fundamental factors affecting the structure and functionality of these lacustrine ecosystems. Their benthos facies consist of a thick layer of organic silt and vegetal detritus, explaining the clogging tendency of the lakes. The main groups of benthic invertebrates are Oligochaeta, Chironomidae, Plecoptera, Bivalves. Gastropods represent the dominant group of the benthic production with 37 species. Thus, the anthropic impact on indigenous microorga-nisms demonstrates their involvement into the biogeochemical cycles, by? chemical-bacterial solubilisa-tion of industrial wastes and supply of metal ions from industrial effluents; concentration and removal of heavy metals from industrial waste waters. Acidophilic microorganisms present in soil and water, by the mineralization of organic substances, ensure circulation of organic matter, releasing mineral elements used by plants for their nutrition.
Key words: eutrophication, lacustrine ecosystems, Danube River, invertebrates, microorganisms

 

Jasmina Krpo-Ćetković, Maja Prica, Srđan Subotić, Miroslav Nikčević, Branislav Mićković:
Length-weight relationship and condition of three goby species in the Danube River near Slankamen (Serbia)
Geomorphologia Slovaca et Bohemica, 18, 2018, 1, 39 - 45.
3 figs., 2 tabs., 28 refs.

Length-weight relationship and condition of 37 individuals of the monkey goby (Neogobius fluviatilis), 115 individuals of the round goby (N. melanostomus), and 40 individuals of the racer goby (Babka gym-notrachelus), caught in July and October 2011 in the Danube River near Slankamen (1216.02 rkm), were analyzed, as well as the relative abundance of each species sample associated with particular sediment types. The average length (± S.D.) of the sampled individuals was 8.76 ± 2.05 cm for the monkey goby, 7.52 ± 1.50 cm for the round goby, and 7.08 ± 0.94 cm for the racer goby. The average weight (± S.D.) of the sampled individuals was 5.49 ± 4.55 g for the monkey goby, 5.84 ± 3.68 g for the round goby, and 3.62 ± 1.78 g for the racer goby. The regression coefficient of the length-weight relationship was b > 3 for each species, which indicates a positive allometric growth. The highest average value of Fulton’s condi-tion factor was observed for the round goby (K = 1.2), followed by the racer goby (K = 1.0), and the lo-west for the monkey goby (K = 0.7). The highest occurrence of the monkey goby was on the sandy bot-tom, of the round goby on silty-coarse pebble bottom, and of the racer goby on pebble bottom.
Key words: length-weight relationship, Fulton's condition factor, allometric growth, bottom type, large river

 

Srđan Subotić, Željka Višnjić-Jeftić, Jasmina Krpo-Ćetković, Mirjana Lenhardt:
Age, growth, and length-weight relationship of common nase (Chondrostoma nasus) in the Danube River near Belgrade (Serbia)
Geomorphologia Slovaca et Bohemica, 18, 2018, 1, 46 - 50.
3 figs., 1 tab., 23 refs.

Growth parameters, length-weight relationship, and condition of the common nase (Chondrostoma nasus) in the Danube River near Belgrade were analyzed on a sample (n=30) from the commercial catch, caught between March and May 2017. The total body length of the sampled individuals ranged from 268 to 401 mm, and body weight from 195 to 875 g. Age was determined from scales and individuals aged 5+, 6+ and 7+ were present in the sample, in approximately the same percentage. The regression coefficient of the length-weight relationship was b = 3.28. The value of b > 3 indicates a positive allometry, which denotes that the weight growth rate is greater than the length growth rate. The Fulton’s condition factor ranged from 0.90 and 1.36, with the mean value of 1.07. The parameters of the von Bertalanffy growth function were L? = 697.84, k = 0.08, and t0 = -1.72. The estimated phi-prime growth performance index (j') was 4.60. The lengths were back-calculated using the method of Monastyrsky, and the greatest relative growth increment was observed in the first and second year of life.
Key words: length-weight relationship, condition factor, length-at-age, back-calculation, allometric growth, large river

 

Ionelia Claudia Goga, Oana Mititelu-Ionuş:
Integrating protected area management and Ichthyo-faunal status for the Adunaţii de Geormane Lake (South-western Romania)
Geomorphologia Slovaca et Bohemica, 18, 2018, 1, 51 - 56.
3 figs., 1 tab., 12 refs.

The purpose of the research is to address current environmental challenges based on close collaboration between stakeholders in order to achieve the sustainable management of the Adunaţii de Geormane Lake. The main theme of study began in 1972, when the lake was populated with Ctenopharyngodon idella in order to capitalize the abundant macrophyte vegetation; this phenomenon led to the excessive multiplica-tion of the species and extension of the phytoplankton that generated “algal blooms”. As a result, the ich-thyofaunistic ratio changed and the numerical superiority of the Ctenopharyngodon idella species was ta-ken over by Carassius gibelio, a species resistant to the lack of oxygen in the water. The study area was declared a protected area in 2000, based on the presence of certain fish species such as Misgurnus fossilis, Umbra krameri, Romanogobio kessleri, Leucaspius delineatus, Rhodeus amarus. The results of the field research revealed the presence of 16 species, Carassius gibelio, Ctenopharyngodon idella, and Abramis brama being dominant species. Beside the ichthyofaunistic study, the importance of the research consists in the proposed measures for the sustainable management by reducing the activities with negative impact (uncontrolled expansion of the human habitat, recreational fishing, recreational activities, non-native inva-sive species and diffuse pollution) and even tourism promotion of the area.
Key words: ichthyofauna, environmental challenges, protected area, the Adunaţii de Geormane Lake

 

Martin T. Dokulil:
Climate warming affects water temperature in the River Danube and tributaries – present and future perspectives
Geomorphologia Slovaca et Bohemica, 18, 2018, 1, 57 - 63.
2 figs., 3 tab., 18 refs.

Global warming increasingly impacts rivers and streams worldwide. Long-term water temperature data from the River Danube and selected tributaries collected by the Austrian Hydrographic Survey were ana-lysed. To show trends unequivocal, monthly mean water temperature data are investigated from stations in the Austrian Danube covering the period 1901–2015. These data are related to air temperature, precipita-tion and discharge. Significant relations of air to water temperature are established at all stations. Results indicate a highly significant increase of about 1.4°C, equivalent to 0.01°C per year. Temperature trends are extrapolated to 2050 using multiple regression analyses and scenarios of future changes in air temperature and discharge.
Key words: climate change, rivers, long-term trend, surface water temperature, prediction