A potential engineering solution to facilitate upstream movement of fish in mountain rivers with weirs: Southern Carpathians, the Azuga River

Voicu, Răzvan; Radecki‐Pawlik, Artur; Tymiński, Tomasz; Mokwa, Marian; Sotir, Robbin B.; Voicu, Liliana

doi:10.1007/s11629-019-5572-y

Cited by 6 publications

(4 citation statements)

References 25 publications

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“…This trend could be consistent with the impact of these anthropogenic structures on fish diversity, probably hindering the movements of some species along the river axis. In some cases, the impacts of the dam were compensated by building channels for lifts that bypass the barrier ( Harris et al, 2017 ; Voicu et al, 2020 ).…”

Section: Discussionmentioning

confidence: 99%

The diet of otters (Lutra lutra) on the Agri river system, one of the most important presence sites in Italy: a molecular approach

Buglione

Petrelli

Troiano

et al. 2020

PeerJ

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Background The Eurasian otter (Lutra lutra) underwent a strong decline in large areas of the Central-Western part of its distribution range, during the second half of the twentieth century. In Italy, only residual fragmented nuclei survive in the Central-Southern part of the peninsula. Nowadays, the otter is one of the most endangered mammals in Italy, and increasing the knowledge about the ecology of this species is a key step in defining fitting management strategies. Here we provide information about the diet of otter on the Agri river system, one of the most important presence sites in Italy, to understand both the species’ food requirements and the impact on fish communities. Methods DNA metabarcoding and High Throughput Sequencing were used on DNA extracted from spraints. We amplified DNA with a primer set for vertebrates, focusing efforts on the bulk of the otter’s diet (fishes and amphibians). Results Our findings showed that the diet of the otter was dominated by cyprinids (97.77%, and 99.14% of fishes), while amphibians represented 0.85% of the sequences analyzed. Results are in general accordance with previous studies based on morphological characterization; however, molecular analyses allow the resolving of some morphological uncertainties. Although the study area offers a very wide range of available prey, the diet of the otters shows marked selectivity. We highlighted a variation in prey consumed, in accordance with the typology of water system (i.e., river, lake, tributary). Some of the preys found in the diet were alien species introduced by man for sport fishing. Our findings could help define strategies useful for the conservation of the otter population in Southern Italy, suggesting management actions directed at avoiding fish community alterations through illegal stockings without severe controls on their taxonomic status. These introductions could result in a general reduction in the diversity of the otter’s preys, affecting its predatory behavior.

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Section: Discussionmentioning

confidence: 99%

The diet of otters (Lutra lutra) on the Agri river system, one of the most important presence sites in Italy: a molecular approach

Buglione

Petrelli

Troiano

et al. 2020

PeerJ

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“…Its sources are located on a lake area 10 km north-east of Gniezno, and the total length of this river is 118 km [50]. The area of the Wełna catchment area reaches 2621.1 km 2 , while the average surface runoff from its area is 4.08 dm 3 •s −1 •km −2 . On the analyzed section of the river, eight constructions were evaluated: Seven weirs and one sill.…”

Section: Methodsmentioning

confidence: 99%

“…In such cases, Tyrolean weirs are often used [2]. However, it should be remembered that the construction of artificial river dams is also connected with several negative consequences for the natural environment, such as: Hindering the migration of fish, loss of the natural character of the river, destruction of habitats, changing environmental flows, and reduction of the diversity of the bottom and shoreline [3][4][5][6][7]. The construction of weirs also affects the flow rate, transport of substances, and changes in the chemical quality of water [8,9].…”

Section: Introductionmentioning

confidence: 99%

AHP as a Useful Tool in the Assessment of the Technical Condition of Hydrotechnical Constructions

2021

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The key challenge for sustainable water management is to carry out a proper assessment of the technical condition of hydrotechnical constructions. Maintaining them in a good state is a prerequisite for ensuring the safety of objects, as well as adjacent areas. This paper compares the results of field research obtained by three methods to assess the technical condition of structures located on the Wełna River. The main objective is to determine the differences between the methods and to indicate the most important assessment elements and criteria. Moreover, it was checked if the Analytic Hierarchy Process (AHP) can be used to carry out the correct assessment of hydrotechnical construction. An assessment that will be based on the hierarchy of factors, which is not often used in other methods. The AHP was applied for the first time to assess the technical condition of hydrotechnical constructions. Based on AHP, three variants of different weights for factors, including exploitation problems and damage to construction elements, were selected. The new variants developed by the authors allow for a more accurate, multifactor assessment. The use of scales to determine the importance of individual elements contributes to the actual representation of the technical condition of the object, which is often over- or underestimated by other assessment methods. The analysis shows that the AHP method is a useful tool to support the assessment of the technical condition of hydrotechnical construction. The use of AHP as a universal assessment method will compare the technical condition of hydrotechnical constructions located all over the world.

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“…for determining water resources, water engineering and management, energy use of watercourses, environmental flow determination issues, but also when a watercourse is used as a receiver of treated wastewater [CUPAK et al 2017]. Low flows are also important for economic purposes, for the use of surface water for agricultural irrigation, electricity production and for the protection of the ecosystem and its biodiversity [JURIK 2020;JURIK et al 2016;ŠTEVKOVÁ et al 2012;VOICU et al 2020;ZIERNICKA-WOJTASZEK, KACZOR 2013].…”

Section: Introductionmentioning

confidence: 99%

Journal of Water and Land Development

Cupak,

Michalec

2022

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The aim of the study was to compare two grouping methods for regionalisation of watersheds, which are similar in respect of low flow and chosen catchments parameters (physiographic and meteorological). In the study, a residual pattern approach and cluster analysis, i.e. Ward's method, were used. The analysis was conducted for specific low flow discharge q 95 (dm 3 •s -1 •km -2 ). In the analysis, 50 catchments, located in the area of the upper and central Vistula River basin, were taken. Daily flows used in the study were monitored from 1976 to 2016. Based on the residual pattern approach (RPA) method, the analysed catchments were classified into two groups, while using the cluster analysis method (Ward's method) -into five. The predictive performance of the complete regional regression model checked by cross-validation R 2 cv was 47% and RMSE cv = 0.69 dm 3 •s -1 •km -2 . The cross validation procedure for the cluster analysis gives a predictive performance equal to 33% and RMSE cv = 0.81 dm 3 •s -1 •km -2 . Comparing both methods, based on the cross-validated coefficient of determination (R 2 cv ), it was found that the residual pattern approach had a better fit between predicted and observed values. The analysis also showed, that in case of both methods, an overestimation of specific low flow discharge q 95 was observed. For the cross-validation method and the RPA method, the PBIAS was -10%. A slightly higher value was obtained for the cross-validation method and models obtained using cluster analysis for which the PBIAS was -13.8%.

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A potential engineering solution to facilitate upstream movement of fish in mountain rivers with weirs: Southern Carpathians, the Azuga River

Cited by 6 publications

References 25 publications

The diet of otters (Lutra lutra) on the Agri river system, one of the most important presence sites in Italy: a molecular approach

The diet of otters (Lutra lutra) on the Agri river system, one of the most important presence sites in Italy: a molecular approach

AHP as a Useful Tool in the Assessment of the Technical Condition of Hydrotechnical Constructions

Journal of Water and Land Development

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