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This study assessed the fish communities’ diversity and structure spatial dynamic in the Timiş River, in correlation with the biotope characteristics to establish management measures.
The results are based on quantitative fish samples from 21 stations of the Timiş River, situated between its sources and the Romanian-Serbian border (241 km). The sam...
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... Brebu Nou Stream (C2) (Fig. 4) and Lung Stream (C3) (Fig. 5), both flowing into the Trei Ape/Three Waters man-made lake, at a distance of few tens of meters, in the proximity of Brebu Village, with less mountainous geomorphological characteristics and a long lasting anthropogenic impact on banks and terraces (deforestation, grazing and colmatation) have strongly ...
Citations
... The last comprehensive survey of the fish fauna of freshwater habitats in Romania, including Transylvania, dates back to 1964 (Bănărescu 1964). In the recent decades, several surveys have been carried out on major rivers in Transylvania, including the Mureș (Nalbant 1995), Criș (Bănărescu et al. 1997), Someș , Olt (Bănăduc 1999), and Timiș (Bănăduc et al. 2013). However, surveys of smaller rivers, such as Tur, Bega, Crasna, Barcău, Ier, Lăpuș, Arieș, among others, are still scarce (Harka et al. 1998;Harka and Bănărescu 1999;Wilhelm et al. 2001Wilhelm et al. , 2002Wilhelm 2007Wilhelm , 2008b. ...
... We have observed a drastic reduction in the distribution of Gymnocephalus schraetser, as this species was not identified during our surveys, except a few records from other verified sources, although it was found in several rivers (Mureș, Crișul Repede, Crișul Negru, Crișul Alb Rivers) in the 1990s (Nalbant 1995;Bănărescu et al. 1999) and later in the Timiș River (Bănăduc et al. 2013). The species is still present in the Someș, Timiș, and Crișul Negru Rivers (single individuals were observed by local anglers; Suppl. ...
Freshwater fishes are in a serious state of decline across the world, making them one of the most threatened groups of vertebrates. The Danube River catchment area in Europe holds the richest freshwater fish community, but our knowledge of the current distribution of these species is limited. Transylvania, the largest region of Romania, is one of the important tributaries of the Danube, from where 77 fish and two lamprey species were recorded until now. Despite this large diversity of freshwater fishes, there is a lack of systematic survey of the fish fauna in this region for the past 50 years. In this study, we present data on the occurrence and distribution of fishes and lampreys collected in Transylvania from 2007 to 2022. This data covers 43% of Romania’s surface and includes all major rivers from Transylvania. 65 species of fish and three species of lampreys are recorded, and an additional nine fish species are also reported based on information from competent people. Of the 77 fish and lamprey species recorded 19 (24.7%) are non-native, although their relative abundance was low (5.1%) compared to other similar regions in Europe. The first records of Eudontomyzon mariae , Neogobius melanostomus , Piaractus brachypomus , Pygocentrus nattereri , and Salvelinus alpinus in Transylvanian rivers are presented, as well as the first record of Cobitis elongata outside the Nera River basin (from the Caraș River) and the detection of three new populations of the vulnerable Umbra krameri . Data on changes in distribution that have occurred since the last comprehensive survey 50 years ago are also provided and the importance of our results in conservation planning are discussed, including the designation of new protected areas for freshwater bodies and the compilation of the Romanian Red List of fishes.
... The Lower Timiş Basin wetlands are defined by a high human activities impact, mainly due to pollution, hydro-technical works, water accumulations, settlement works and construction of dikes and banks defense, agricultural and industrial development, and urbanization, inducing favorable habitat destruction of its fish fauna [283][284][285]. The impacts of climate change on this area's fish species have not yet been studied. ...
Throughout their history humans “tamed” not only the Danube River basin land, but also the river and its associated wetlands, drastically influencing their characteristic habitats, associations, communities, and species. One of these flagship endemic fish species in this respect is the European mudminnow (Umbra krameri Walbaum, 1792), influenced by Danube Basin geography, history, politics, and ecology. A study about this European community concern species in the context of long term human impact on its specific habitats, with potential synergic negative effects of climate change, was treated as highly needed, in an international researchers group initiative to support the efforts to provide hope for preserving this fish species and its ecosystems, and brought it back from the brink of extinction. All the characteristic inventoried wetlands which were or some of them still are natural, semi-natural, or accidental anthropogenic habitats, reveal an accentuated diminishing trend of this species areal continuity; fragmentation being the force which skewed it drastically untill now, and inducing diminishing the specific habitats quantitative and qualitative characteristics in the Danube Basin where these fish fight for survival. The main categories of human activities which impacted the climate changes in the context of this species’ habitats are: water regulation, pollution, dredging, draining, and introduction of non-native species. Overall, the diverse human impact in a climate changes in the context of this species’ habitats, Umbra krameri wetlands, creates serious perspectives on negatively influencing this at a very high scale and level. All the inventoried wetlands where Umbra krameri still survive can be considered an ecologically managed as a refuge and stepping stone wetlands, especially in the increasing climate change trend situation. Supplementary inventory studies in the field should be done for the identification of some may be unknown Umbra krameri habitats and populations.
... The Lower Timiş Basin wetlands are defined by a high human activities impact, mainly due to pollution, hydro-technical works, water accumulations, settlement works and construction of dikes and banks defense, agricultural and industrial development, and urbanization, inducing favorable habitat destruction of its fish fauna [283][284][285]. The impacts of climate change on this area's fish species have not yet been studied. ...
Throughout their history humans “tamed” not only the Danube River basin land, but also the river and its associated wetlands, drastically influencing their characteristic habitats, associations, communities, and species. One of these flagship endemic fish species in this respect is the European mudminnow (Umbra krameri Walbaum, 1792), influenced by Danube Basin geography, history, politics, and ecology. A study about this European community concern species in the context of long term human impact on its specific habitats, with potential synergic negative effects of climate change, was treated as highly needed, in an international researchers group initiative to support the efforts to provide hope for preserving this fish species and its ecosystems, and brought it back from the brink of extinction. All the characteristic inventoried wetlands which were or some of them still are natural, semi-natural, or accidental anthropogenic habitats, reveal an accentuated diminishing trend of this species areal continuity; fragmentation being the force which skewed it drastically untill now, and inducing diminishing the specific habitats quantitative and qualitative characteristics in the Danube Basin where these fish fight for survival. The main categories of human activities which impacted the climate changes in the context of this species’ habitats are: water regulation, pollution, dredging, draining, and introduction of non-native species. Overall, the diverse human impact in a climate changes in the context of this species’ habitats, Umbra krameri wetlands, creates serious perspectives on negatively influencing this at a very high scale and level. All the inventoried wetlands where Umbra krameri still survive can be considered an ecologically managed as a refuge and stepping stone wetlands, especially in the increasing climate change trend situation. Supplementary inventory studies in the field should be done for the identification of some may be unknown Umbra krameri habitats and populations.
... Next, the retrieved scientific publications for Romania were used to collate a database containing information on 55 hydropower plants, detailing the presence and dominance of fish species both in the selected historic reference time [47] and after the construction of the hydropower plant (upstream and downstream) [18][19][20]22,[53][54][55][56][57][58][59][60][61][62][63][64][65][66][67][68]. The database was supplemented by original data provided by D.B. and A. C.-B. ...
... Concerning impacts on fish, Anderson, Moggridge [10] emphasised the need for studies on native communities and for long-term data that would enable a before-and-after assessment of temporal changes, instead of spatial comparison with "control" reaches, which could limit generalisability of the conclusions of the respective study [106]. Several of the Romanian studies reviewed provided very sound evidence of HP impacts by use of historic reference data [47,48] or long monitoring records [72,78], [21,[55][56][57]79,107,108] that had not been analysed in a synoptic way before that. They included several case studies from similar ichthyological zones coupled with long-term monitoring data of the hydrological regime of the rivers impacted by the HPPs, and thus reported valuable data on the links between hydromorphological alterations and specific biota. ...
Hydropower is currently experiencing a boom in southeast Europe. For Romania, the number of hydropower plants is estimated to be between 545 and 674, but little has been published about their environmental impact. We provide the first overview of the geographical distribution of hydropower plants in Romania, supplemented by a review of current knowledge about their environmental impact, and present case study evidence on the effects of small hydropower plants on fish in headwater streams of the Carpathian Mountains.
We show that 49% of the documented 545 hydropower plants in Romania are located in Natura 2000 or other protected areas, 5% are located in water bodies with ‘very good’ ecological status, and another 12% in water bodies with ‘good’ ecological status and ‘very good’ hydromorphological status according to the EU Water Framework Directive. Second, we demonstrate that hydropower plants significantly impact fish populations in several ways, both in upstream and downstream reaches, e.g. by water abstraction, dam construction and other hydromorphological alterations. Following the construction of hydropower plants in headwater streams, trout (Salmo trutta fario) and bullhead (Cottus gobio) populations often disappeared completely, and only remained in 38% of the stream reaches either upstream or downstream of the respective hydropower plants.
In conclusion, the significant environmental impacts of each individual hydropower plant combined with the large number of them as well as the relative lack of effort to mitigate environmental impacts together represent a significant threat to aquatic biodiversity in Romania. The impacts exerted by hydropower plants are often unjustifiable by public interest according to EU directives, as small hydropower plants account for only around 3% of Romania's total electricity production. Better availability and access to environmental monitoring data are needed, as this would greatly support the development of more integrative management approaches to Romanian rivers.
... In Romania, spirlin was mentioned in some studies (Bănăduc et al., 2013;Curtean-Bănăduc and Bănăduc, 2007;Györe et al., 2013), but few scientific papers include detailed information about the spirlin (Bănărescu, 1964;Papadopol and Cristofor, 1980;Cocan et al., 2015). The aim of this study is to present the morphometric profile of the spirlin from four rivers from Transylvania, as well as to produce more data regarding this species in Romania. ...
Spirlin (Alburnoides bipunctatus) is found in great numbers in most Transylvanian rivers. The species has an important role in the ecosystems in which it is found in terms of feeding and habitat occupation. The morphmetric characthers of this species vary between different habitats, outlining morphometric plasticity. Morphometric profiles were made for different populations of Spirlin, to evaluate differences in body shape. Considering that different environmental conditions influence the morphology of Spirlin populations, morphometric characteristics were determined. In order to assess differences in spirlin body shape, specimens from the four major Transylvanian catchments were collected by angling techniques. The specimens were preserved and transported to the University of Agricultural Sciences and Veterinary Medicine, Cluj-Napoca, where morphometric measurements and weight determinations were conducted in the Physiology of Aquatic Organisms Laboratory. Spirlin from Mures, Somes, Cris and Viseu catchments were studied, as it follows: 21 specimens from Aries River (Mures catchment), 61 specimens from the river Crisul Repede (Cris catchment), 21 specimens from Somesul Mic River (Somes catchment) and 20 specimens from Viseu River. A number of 39 determinations were made. The obtained results reflect the morphometric differences among populations of Spirlin from some Transylvanian main rivers.
... The species is vulnerable to water pollution and ambient temperature changes, and alteration in its proper habitat (Holcik 1999). On the Romanian national territory the range of the Rhodeus amarus becomes more fragmented, especially in the last half of the century, due to the human impacts, which are different from one basin/basin sector to another and even in some protected areas (Ardelean and Wilhelm, 2007b, Battes et al., 2003, 2005, Bănăduc, 2001, 2005, 2007, 2008a Bănăduc and Curtean-Bănăduc, 2013, Bănăduc et al., 2013, Bănărescu, 1964, Bănărescu and Bănăduc, 2007, Costiniuc and Gorgan, 2004, Costiniuc et al., 2006a Florea and Contoman, 2014a, b, Oţel, 2007, Pintileasa et al., 2011, Radu et al., 2008, Simalcsik et al., 2004, Telcean, 1999, Telcean and Bănărescu, 2002, Telcean and Cupșa, 2009a, b, Meșter et al., 2003, Momeu et al., 2009, Năstase et al., 2008, Năvodaru, 2004, Năvodaru and Năstase, 2006, Ureche, 2008, Ureche et al., 2010, Vornicu et al., 2006). The current structural composition of the fish communities, including Rhodeus amarus, in the Natura 2000 site Oltul Mijlociu – Cibin – Hârtibaciu (ROSCI0132) shows decreased numbers as a result of historical continuous human impact. ...
... The species is vulnerable to water pollution and ambient temperature changes, and alteration in its proper habitat (Holcik 1999). On the Romanian national territory the range of the Rhodeus amarus becomes more fragmented, especially in the last half of the century, due to the human impacts, which are different from one basin/basin sector to another and even in some protected areas (Ardelean and Wilhelm, 2007b, Battes et al., 2003, 2005, Bănăduc, 2001, 2005, 2007, 2008a Bănăduc and Curtean-Bănăduc, 2013, Bănăduc et al., 2013, Bănărescu, 1964, Bănărescu and Bănăduc, 2007, Costiniuc and Gorgan, 2004, Costiniuc et al., 2006a Florea and Contoman, 2014a, b, Oţel, 2007, Pintileasa et al., 2011, Radu et al., 2008, Simalcsik et al., 2004, Telcean, 1999, Telcean and Bănărescu, 2002, Telcean and Cupșa, 2009a, b, Meșter et al., 2003, Momeu et al., 2009, Năstase et al., 2008, Năvodaru, 2004, Năvodaru and Năstase, 2006, Ureche, 2008, Ureche et al., 2010, Vornicu et al., 2006). The current structural composition of the fish communities, including Rhodeus amarus, in the Natura 2000 site Oltul Mijlociu – Cibin – Hârtibaciu (ROSCI0132) shows decreased numbers as a result of historical continuous human impact. ...
The main threats to the Rhodeus amarus (Bloch, 1782) populations in the Natura 2000 site Oltul Mijlociu – Cibin – Hârtibaciu are the hydro technical modifications of the riverbeds, chemical pollution and poachery. ADONIS:CE is used in general for modeling business processes, but here was used in ecology/biology domain. The authors obtained a Rhodeus amarus model which included all the habitat species requirements, the indicators that provide favourable conservation status and the existing threats and pressures. The maintaining of the minor riverbed morphodynamics is very important – the meanders presence is very important for the local molluscs which are living in the inner U shape parts of the river. The places, where the sediments (sand, mud) are relatively stable, provide suitable habitats for molluscs important for the breeding of Rhodeus amarus. The maintaining of the actual regimes of liquid flows and oxygenation, and the avoidance of increasing of the sediments deposition rate in the water are necessary also for those molluscs species presence conservation. The extraction of sediments in these rivers should be made in correspondence with their natural rate of refilling and at sites at a distance of minimum five kilometres from each other.
ABSTRACT: 26 fish species were affected by the Coştei historical diversion hydrotechnical system build in 1758. In order to mitigate the negative effects produced by this hydrotechnical work on the fish, a migration system, of nature-like meandering by pass type was proposed. The dimensions of this channel and the slope of about 2% allow fish, and other aquatic organisms to move upstream and downstream of the spillway. RÉSUMÉ: Le noeud de dérivation hydrographique de Coştei, une qualité historique de l'environnement et l'accessibilité aux ressources biologiques changent la donne; problèmes anthropiques induits et solutions durables-une perspective ichtyologique. 26 espèces de poissons ont été affectées par le Coştei système hydrotechnique de dérivation historique construit en 1758. Afin d'atténuer les effets négatifs produits par ces travaux hydrotechniques sur les poissons, un système de migration, de méandres par type de passe, de nature similaire a été proposé. Les dimensions de ce chenal et la pente d'environ 2% permettent aux poissons et à d'autres organismes aquatiques de se déplacer en amont et en aval du déversoir.
REZUMAT: Nodul hidrografic deversor Coştei, un modificator istoric al calităţii mediului şi a accesibilităţii resurselor biologice; probleme induse antropic şi soluţii durabile o perspectivă ihtiologică. 26 specii de peşti au fost afectate de nodul hidrotehnic deversor Coştei construit în 1758. Pentru a atenua efectele negative produse de această lucrare hidrotehnică asupra peştilor, s-a propus un sistem de migraţie, de tip by pass meandrat. Dimensiunile acestui canal şi panta de aproximativ 2% permit peştilor şi altor organisme acvatice să se deplaseze în amonte şi în aval de deversor.
The probability of occurrence, distribution, and abundance of bleak, common spirlin, and sunbleak in 316 small rivers of the Republic of Tatarstan were studied. The studied region has a high geographical and environmental heterogeneity. The impact of environmental factors on species occurrence was analyzed with generalized linear models. Among the selected fish, sunbleak had the highest probability of occurrence, and bleak had the highest abundance. Elevation was the only environmental variable significantly affecting the probability of occurrence of all three species. With an increase in elevation, the probability of occurrence of bleak, common spirlin, and sunbleak significantly decreased. Optimum values and niche breadth differed significantly between fish species for some of the environmental variables.
ADONIS:CE has been used as a base to create a support-system management decision-making model for Alburnus alburnus (Linnaeus, 1758) and Alburnoides bipunctatus (Bloch, 1782) species. Investigation of the habitat necessities and the identification of the necessary elements for a good status of conservation of these two fish species populations has revealed the pressures and threats to these congener species, for which specific management activities have been finally recommended.
There are many obstacles in rivers that prevent or hinder passage of fish past barriers. Here, we present a specially designed solution for juvenile and adult brown trout so that they may to swim past discharge-regulating weirs in the upper Caraş River in both the upstream and downstream directions. The proposed solution relies on gravity flow and will have current velocities that will not inhibit weak swimmers swimming upstream to pass the weirs. Corrosion-resistant materials and the absence of components that could potentially injure the fish will be used in the construction of these technical solutions. Although testing of the functionality of this solutions for upstream-downstream and downstream-upstream passage of weirs is needed, we believe that if implemented, it should improve connectivity especially for brown trout and consequently conserve within-stream genetic diversity in the Caraş River and where appropriate in alike other Carpathian lotic systems with similar types of weirs.
