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Akstinas V, Virbickas T, Meilutytė-Lukauskienė D, Šarauskienė D, Vezza P, Kriaučiūnienė J, Rakauskas V, Steponėnas A, Jurgelėnaitė A, Jakimavičius D, Nazarenko S. Multicomponent assessment of the impact of hydropower cascade on fish metrics. Sci Total Environ 2024; 906:167541. [PMID: 37797772 DOI: 10.1016/j.scitotenv.2023.167541] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Revised: 08/28/2023] [Accepted: 09/30/2023] [Indexed: 10/07/2023]
Abstract
The water sector is one of the priority areas of the European Union; therefore, legislation encourages the development of methods to protect the river ecosystem. The key to this is the characterization of the river's physical features with respect to ecological quality. Rivers are a complex system in which geomorphic conditions, hydrological regime, and ecological indicators interact. The group of hydropower plants (HPPs) that forms a hydropower cascade disturbs the natural continuity of river system components. Analysis of the spatial and temporal alterations in the river environment is important for understanding the potential impact of the hydropower cascade on ecological indicators. In a current study, the multicomponent assessment was used to evaluate the impact of the hydropower cascade of five HPPs on fish metrics as ecological indicators in the case study Varduva River. The research involved field surveys to collect hydrological data in highly affected ungauged river to estimate indicators of hydrologic alterations under HPPs operation, use of Unmanned Aerial Vehicles and digital photogrammetry to map geomorphic units, fish sampling to estimate composition of fish species and guilds, and fish habitat availability modelling based on the collected data and the conditional habitat suitability criteria using the MesoHABSIM modelling approach. Results revealed that the technical characteristics of HPPs determined their individual operation mode, which had a crucial impact on the hydrologic alterations of the river and, together with the distance between the dams, on the variation of fish metrics in the hydropower cascade. The intensive operation of the hydropower cascade created adverse effects for intolerant fish but was advantageous for tolerant fish species. The proposed HPP multimetric correlated with the fish metrics and showed similar tendencies between HPPs as habitat integrity index (IH), derived from MesoHABSIM modelling.
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Affiliation(s)
- Vytautas Akstinas
- Laboratory of Hydrology, Lithuanian Energy Institute, Kaunas, Lithuania.
| | - Tomas Virbickas
- Laboratory of Fish Ecology, Nature Research Centre, Vilnius, Lithuania
| | | | - Diana Šarauskienė
- Laboratory of Hydrology, Lithuanian Energy Institute, Kaunas, Lithuania
| | - Paolo Vezza
- Department of Environment, Land, and Infrastructure Engineering, Politecnico di Torino, Turin, Italy
| | | | | | | | | | | | - Serhii Nazarenko
- Laboratory of Hydrology, Lithuanian Energy Institute, Kaunas, Lithuania
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Skrodenytė-Arbačiauskienė V, Virbickas T, Lukša J, Servienė E, Blažytė-Čereškienė L, Kesminas V. Gut Microbiome of Wild Baltic Salmon (Salmo salar L.) Parr. Microb Ecol 2022; 84:1294-1298. [PMID: 34741645 DOI: 10.1007/s00248-021-01910-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Accepted: 10/25/2021] [Indexed: 06/13/2023]
Abstract
Gut microbiota of wild Baltic salmon (a sub-population of Atlantic salmon Salmo salar L.) parr was first analyzed using microbial profiling of the 16S rRNA gene (V3-V4 region) and high taxonomic richness was revealed. At the phylum level, the gut microbiota was dominated by Firmicutes, Actinobacteria, and Proteobacteria, the most numerous of which were Firmicutes. The phylum Tenericutes (mainly assigned to Mycoplasmataceae), which is common both in wild North- and East- Atlantic salmon parr, was not detected in Baltic salmon parr. Across all samples, unique amplicon sequence variants (ASVs) belonging to the unclassified Bacilli, Actinomycetales, and Rhizobiales were identified as the major taxa. Fifteen ASVs at the family level were found in all gut samples of Baltic salmon parr, the majority of which were Mycobacteriaceae, Cryptosporangiaceae, Microbacteriaceae, and Planctomycetaceae. At the genus level, Mycobacterium, Clostridium sensu stricto, and Hyphomicrobium were dominant but at low levels in all gut samples. Our study has revealed that the gut microbial community of wild Baltic salmon parr differs from those of wild North- and East-Atlantic salmon parr. This can be due to biogeographical differences or host-selective pressures, as the Baltic salmon population is believed to have split from the Atlantic salmon population in the Ancylian period.
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Affiliation(s)
| | - Tomas Virbickas
- Institute of Ecology, Nature Research Centre, Vilnius, Lithuania
| | - Juliana Lukša
- Institute of Botany, Nature Research Centre, Vilnius, Lithuania
| | - Elena Servienė
- Institute of Botany, Nature Research Centre, Vilnius, Lithuania
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Butrimienė R, Kalnaitytė A, Januškaitė E, Bagdonas S, Jurgelėnė Ž, Butkauskas D, Virbickas T, Montvydienė D, Kazlauskienė N, Skrodenytė-Arbačiauskienė V. Interactions of semiconductor Cd-based quantum dots and Cd 2+ with gut bacteria isolated from wild Salmo trutta fry. PeerJ 2022; 10:e14025. [PMID: 36128199 PMCID: PMC9482770 DOI: 10.7717/peerj.14025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Accepted: 08/16/2022] [Indexed: 01/19/2023] Open
Abstract
Background With the rapid development of nanotechnology, more and more nanoproducts are being released into the environment where they may both pose ecological risks and be toxic to living organisms. The ecotoxicological impact of quantum dots (QDs), a class of nanoparticles (NPs), on aquatic organisms is becoming an emerging issue, this due to their nano-specific properties, to the physico-chemical transformation in the environment and to the possible release of toxic metals from their structure such as Cd. Methods In this work, (i) spectroscopic measurements of commercially available Cd-based QDs (CdSe/ZnS-COOH) were made at various pH values (5.0 and 7.0) to study their interactions (at a concentration of 4 nm) with various strains of Gram-positive and Gram-negative gut bacteria after short-term exposure and (ii) the antibacterial efficacy of QDs and Cd2+ (at a concentration 0.09-3.56 mM) against gut bacteria isolated from wild freshwater Salmo trutta fry was studied at different temperatures (15 °C and 25 °C) and pH values (5.0 and 7.0) by applying a well-established disc diffusion assay. Results Twenty-six gut bacterial isolates from wild Salmo trutta fry were identified as Aeromonas spp., A. popoffii, A. salmonicida, A. sobria, Carnobacterium maltaromaticum, Buttiauxella sp., Listeria sp., Microbacterium sp., Shewanella putrefaciens and Serratia sp. Cd-based (CdSe/ZnS-COOH) QDs at a concentration of 4 nm were found to be stable in aqueous media (with pH 7.0) or starting to form aggregates (at pH 5.0), thus, apparently, did not release heavy metals (HMs) into the media over 48 h in conditions of light or dark and did not show antibacterial efficacy on the gut bacteria isolated from wild Salmo trutta fry after short-term (9 h and 48 h) incubations. Cd2+ was found to produce significant dose-dependent toxic effects on bacterial growth, and the size of the inhibition zones on some of the tested strains significantly correlated with temperature. The most sensitive and the most resistant to Cd2+ were the Gram-positive bacteria, for which the minimum inhibitory concentration (MIC) values of Cd2+ were 0.09-0.27 mM and 3.11-3.29 mM respectively and varied significantly between the tested temperatures (15 °C and 25 °C). The MIC values of Cd2+ for the Gram-negative bacteria (18 out of 22 strains) ranged from 0.44 to 0.71 mM and did not differ significantly between the tested temperatures. Among the selected Gram-positive and Gram-negative strains, those with the higher sensitivity towards Cd2+ also revealed relatively stronger signals of QDs photoluminescence (PL) when transferred after incubation into fresh medium without QDs. In addition, the formation of endogenous metalloporphyrins observed spectroscopically in some bacterial strains indicates certain differences in metabolic activity that may play a protective role against potential oxidative damage.
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Affiliation(s)
| | - Agnė Kalnaitytė
- Laser Research Center, Physics Faculty, Vilnius University, Vilnius, Lithuania
| | - Emilija Januškaitė
- Laser Research Center, Physics Faculty, Vilnius University, Vilnius, Lithuania
| | - Saulius Bagdonas
- Laser Research Center, Physics Faculty, Vilnius University, Vilnius, Lithuania
| | - Živilė Jurgelėnė
- Institute of Ecology, Nature Research Centre, Vilnius, Lithuania
| | | | - Tomas Virbickas
- Institute of Ecology, Nature Research Centre, Vilnius, Lithuania
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Rakauskas V, Virbickas T, Steponėnas A. Several decades of two invasive fish species (Perccottus glenii, Pseudorasbora parva) of European concern in Lithuanian inland waters; from first appearance to current state. Journal of Vertebrate Biology 2021. [DOI: 10.25225/jvb.21048] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Vytautas Rakauskas
- Laboratory of Fish Ecology, Nature Research Centre, Vilnius, Lithuania; e-mail: , ,
| | - Tomas Virbickas
- Laboratory of Fish Ecology, Nature Research Centre, Vilnius, Lithuania; e-mail: , ,
| | - Andrius Steponėnas
- Laboratory of Fish Ecology, Nature Research Centre, Vilnius, Lithuania; e-mail: , ,
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Makaras T, Stankevičiūtė M, Šidagytė-Copilas E, Virbickas T, Razumienė J. Acclimation effect on fish behavioural characteristics: determination of appropriate acclimation period for different species. J Fish Biol 2021; 99:502-512. [PMID: 33783817 DOI: 10.1111/jfb.14740] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2020] [Revised: 03/08/2021] [Accepted: 03/25/2021] [Indexed: 06/12/2023]
Abstract
In the present study, the authors investigated the effect of acclimation duration (up to 4 h) on behavioural characteristics of taxonomically and functionally different fish species, i.e., the migratory rheophilic salmonids rainbow trout (Oncorhynchus mykiss) and Atlantic salmon (Salmo salar), and the non-migratory eurytopic European perch (Perca fluviatilis) and three-spined stickleback (Gasterosteus aculeatus). Specifically, the authors explored fish behavioural patterns based on specific endpoints (average, maximum and angular velocity) during the acclimation period, and determined the acclimation period suitable for the tested fish species. The performed behavioural data analysis showed that the minimum time needed to adjust fish activity to a more stable (baseline) level should be at least 2 h for O. mykiss and S. salar and 1 h for G. aculeatus. Nonetheless, P. fluviatilis behaviour did not show significant changes during the 4 h acclimation. The results of this study revealed that the effect of the acclimation duration on such rheophilic species as O. mykiss and S. salar was greater than that on the eurytopic species P. fluviatilis and G. aculeatus, indicating that acclimation period is important in managing fish stress before behavioural observations. For all species, the highest variability was found in the endpoint of maximum velocity, and the lowest in that of angular velocity. This study showed that before starting actual toxicity testing experiments, it is important to determine an appropriate, species-specific acclimation period.
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Affiliation(s)
- Tomas Makaras
- Nature Research Centre, Vilnius, Lithuania
- Life Sciences Center, Vilnius University, Vilnius, Lithuania
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Virbickas T, Vezza P, Kriaučiūnienė J, Akstinas V, Šarauskienė D, Steponėnas A. Impacts of low-head hydropower plants on cyprinid-dominated fish assemblages in Lithuanian rivers. Sci Rep 2020; 10:21687. [PMID: 33303845 PMCID: PMC7728750 DOI: 10.1038/s41598-020-78701-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Accepted: 11/23/2020] [Indexed: 11/17/2022] Open
Abstract
The meso-scale habitat simulation model MesoHABSIM was applied in three Lithuanian lowland rivers to study the effect of low-head hydropower plants (HPPs) on the fish habitats. Stream flow time series on a daily scale for the period 1970–2015 were used to describe flow regime downstream of HPPs for periods before and after their installation. Conditional habitat suitability criteria were developed for 4 species of cyprinid fish, schneider (Alburnoides bipunctatus), dace (Leuciscus leuciscus), roach (Rutilus rutilus) and vimba (Vimba vimba) to simulate their available habitat at different water discharges. Modelling results showed that HPPs have a significant impact on habitat availability in the low flow period in dry years below HPPs due to insufficient released flow. The environmental flow, as prescribed by the Lithuanian national law, is estimated between 80 and 95% exceedance probability of the mean minimum discharge of 30 days. This flow leads to a significant reduction in frequency and duration of available suitable habitats for vimba and schneider during low flow period. The roach habitat is the least affected. The results of habitat modelling are in line with the actual data on the occurrence and relative abundance of considered fish species in the studied river stretches. A general comparison of the relative abundance of modelled fish species in 42 natural river stretches and 20 stretches below the HPPs also showed that the relative abundance of roach is significantly higher, and that of schneider is significantly lower in river sections below the HPPs than the abundance in natural river sections. All results indicate that the current environmental flow does not secure survival of certain fish species. The applicability of the average low flow release during summer could be a plausible alternative to the current environmental flow in order to maintain ecosystem health and services.
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Affiliation(s)
- Tomas Virbickas
- Nature Research Centre, Akademijos 2, 08412, Vilnius, Lithuania.
| | - Paolo Vezza
- Department of Environment, Land and Infrastructure Engineering, Politecnico di Torino, Corso Duca degli Abruzzi, 24, 10129, Turin, Italy
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Kriaučiūnienė J, Virbickas T, Šarauskienė D, Jakimavičius D, Kažys J, Bukantis A, Kesminas V, Povilaitis A, Dainys J, Akstinas V, Jurgelėnaitė A, Meilutytė-Lukauskienė D, Tomkevičienė A. Fish assemblages under climate change in Lithuanian rivers. Sci Total Environ 2019; 661:563-574. [PMID: 30682609 DOI: 10.1016/j.scitotenv.2019.01.142] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2018] [Revised: 12/21/2018] [Accepted: 01/12/2019] [Indexed: 06/09/2023]
Abstract
Alterations of abiotic factors (e.g., river water temperature and discharge) will definitely affect the fundamental processes of aquatic ecosystems. The purpose of this study was to examine the impact of climate change on the structure of fish assemblages in fast-flowing rivers belonging to the catchment of the major Eastern European river, the Nemunas. Five catchments of semi-natural rivers were selected for the study. Projections of abiotic factors were developed for the near (2016-2035) and far future (2081-2100) periods, according to four RCP scenarios and three climate models using the HBV hydrological modelling tool. Fish metric projections were developed based on a multiple regression using spatial data. No significant changes in projections of abiotic and biotic variables are generally expected in the near future. In the far future period, the abiotic factors are projected to change significantly, i.e., river water temperature is going to increase by 4.0-5.1 °C, and river discharge is projected to decrease by 16.7-40.6%, according to RCP8.5. By the end of century, the relative abundance of stenothermal fish is projected to decline from 24 to 51% in the reference period to 0-20% under RCP8.5. Eurythermal fish should benefit from climate change, and their abundance is likely to increase from 16 to 38% in the reference period to 38-65% under RCP8.5. Future alterations of river water temperature will have significantly more influence on the abundance of the analysed fish assemblages than river discharge.
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Affiliation(s)
- J Kriaučiūnienė
- Laboratory of Hydrology, Lithuanian Energy Institute, Kaunas, Lithuania
| | - T Virbickas
- Laboratory of Fish Ecology, Nature Research Centre, Vilnius, Lithuania
| | - D Šarauskienė
- Laboratory of Hydrology, Lithuanian Energy Institute, Kaunas, Lithuania.
| | - D Jakimavičius
- Laboratory of Hydrology, Lithuanian Energy Institute, Kaunas, Lithuania
| | - J Kažys
- Department of Hydrology and Climatology, Vilnius University, Vilnius, Lithuania
| | - A Bukantis
- Department of Hydrology and Climatology, Vilnius University, Vilnius, Lithuania
| | - V Kesminas
- Laboratory of Fish Ecology, Nature Research Centre, Vilnius, Lithuania
| | - A Povilaitis
- Institute of Water Resources Engineering, Vytautas Magnus University, Kaunas-Akademija, Lithuania
| | - J Dainys
- Laboratory of Fish Ecology, Nature Research Centre, Vilnius, Lithuania
| | - V Akstinas
- Laboratory of Hydrology, Lithuanian Energy Institute, Kaunas, Lithuania
| | - A Jurgelėnaitė
- Laboratory of Hydrology, Lithuanian Energy Institute, Kaunas, Lithuania
| | | | - A Tomkevičienė
- Laboratory of Hydrology, Lithuanian Energy Institute, Kaunas, Lithuania
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Stankevičiūtė M, Sauliutė G, Makaras T, Markuckas A, Virbickas T, Baršienė J. Responses of biomarkers in Atlantic salmon (Salmo salar) following exposure to environmentally relevant concentrations of complex metal mixture (Zn, Cu, Ni, Cr, Pb, Cd). Part II. Ecotoxicology 2018; 27:1069-1086. [PMID: 29987536 DOI: 10.1007/s10646-018-1960-2] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 06/25/2018] [Indexed: 06/08/2023]
Abstract
The aim of this research was to assess interactions between metals at low exposure concentrations (Maximum-Permissible-Concentrations accepted for the inland waters in EU) and to assess possible influence of background exposure (10-times reduced concentration of a single metal) on toxicological significance of selected biomarkers in Salmo salar after treatment with metal mixture (Zn - 0.1, Cu - 0.01, Ni - 0.01, Cr - 0.01, Pb - 0.005 and Cd - 0.005 mg/L). The tissue-specific bioaccumulation, genotoxicity and cytotoxicity responses (erythrocytic nuclear abnormalities assay) in peripheral blood, kidneys, gills and liver erythrocytes of fish to metal mixtures were assessed after 14 days treatment. Treatment with primary mixture (MIX) or two variants of this mixture (Cr↓ (10 times reduced Cr6+ concentration) and Cu↓ (10 times reduced Cu2+ concentration)) induced the strongest responses in genotoxicity and cytotoxicity endpoints. Exposure to these mixtures highly affected Zn, Cu and Cd bioaccumulation in liver tissue. The highest amount of Ni accumulated was measured after Cd↓ treatment in all tissues. Treatments with reduced concentration of non-essential metal resulted in an increased accumulation of Pb, Ni, or Cd; treatments with reduced concentration of essential metal resulted in a reduced accumulation of certain metals (especially Cd and Pb) in tissues compared between treatments. Glucose content in blood and behavioural endpoints were evaluated after short-term exposure to metal mixtures (MIX, Cr↓, Cu↓). Significant increase in blood glucose concentration was measured after all treatments. These metal mixtures elicit significant behavioural alterations in fish. Consequently, this research revealed a significant influence of background exposure considering mixture toxicity.
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Affiliation(s)
| | - Gintarė Sauliutė
- Nature Research Centre, Akademijos str. 2, Vilnius, 08412, Lithuania
| | - Tomas Makaras
- Nature Research Centre, Akademijos str. 2, Vilnius, 08412, Lithuania
| | - Arvydas Markuckas
- Department of Biochemistry and Molecular Biology, Life Sciences Center, Vilnius University, Saulėtekio av. 7, Vilnius, 10223, Lithuania
| | - Tomas Virbickas
- Nature Research Centre, Akademijos str. 2, Vilnius, 08412, Lithuania
| | - Janina Baršienė
- Nature Research Centre, Akademijos str. 2, Vilnius, 08412, Lithuania
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Poikane S, Ritterbusch D, Argillier C, Białokoz W, Blabolil P, Breine J, Jaarsma NG, Krause T, Kubečka J, Lauridsen TL, Nõges P, Peirson G, Virbickas T. Response of fish communities to multiple pressures: Development of a total anthropogenic pressure intensity index. Sci Total Environ 2017; 586:502-511. [PMID: 28214116 PMCID: PMC6461715 DOI: 10.1016/j.scitotenv.2017.01.211] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2016] [Revised: 01/27/2017] [Accepted: 01/27/2017] [Indexed: 05/26/2023]
Abstract
Lakes in Europe are subject to multiple anthropogenic pressures, such as eutrophication, habitat degradation and introduction of alien species, which are frequently inter-related. Therefore, effective assessment methods addressing multiple pressures are needed. In addition, these systems have to be harmonised (i.e. intercalibrated) to achieve common management objectives across Europe. Assessments of fish communities inform environmental policies on ecological conditions integrating the impacts of multiple pressures. However, the challenge is to ensure consistency in ecological assessments through time, across ecosystem types and across jurisdictional boundaries. To overcome the serious comparability issues between national assessment systems in Europe, a total anthropogenic pressure intensity (TAPI) index was developed as a weighted combination of the most common pressures in European lakes that is validated against 10 national fish-based water quality assessment systems using data from 556 lakes. Multi-pressure indices showed significantly higher correlations with fish indices than single-pressure indices. The best-performing index combines eutrophication, hydromorphological alterations and human use intensity of lakes. For specific lake types also biological pressures may constitute an important additional pressure. The best-performing index showed a strong correlation with eight national fish-based assessment systems. This index can be used in lake management for assessing total anthropogenic pressure on lake ecosystems and creates a benchmark for comparison of fish assessments independent of fish community composition, size structure and fishing-gear. We argue that fish-based multiple-pressure assessment tools should be seen as complementary to single-pressure tools offering the major advantage of integrating direct and indirect effects of multiple pressures over large scales of space and time.
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Affiliation(s)
- Sandra Poikane
- European Commission Joint Research Centre, Directorate for Sustainable Resources, Water and Marine Resources Unit, I-21027 Ispra, VA, Italy.
| | - David Ritterbusch
- Institute of Inland Fisheries, Im Königswald 2, 14469 Potsdam-Sacrow, Germany
| | - Christine Argillier
- Irstea, UR RECOVER, 3275 Route de Cézanne CS 40061, 13182 Aix en Provence Cedex 5, France
| | - Witold Białokoz
- Inland Fisheries Institute, Oczapowskiego 10-719, Olsztyn, Poland
| | - Petr Blabolil
- Institute of Hydrobiology, Biology Centre of the Czech Academy of Sciences, Na Sádkách 7, 370 05 České Budějovice, Czech Republic; Faculty of Science, University of South Bohemia, Branišovská 31, 370 05 České Budějovice, Czech Republic
| | - Jan Breine
- Research Institute for Nature and Forest, Dwersbos 28, B-1630 Linkebeek, Belgium
| | | | - Teet Krause
- Centre for Limnology, Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 5, 51014 Tartu, Estonia
| | - Jan Kubečka
- Institute of Hydrobiology, Biology Centre of the Czech Academy of Sciences, Na Sádkách 7, 370 05 České Budějovice, Czech Republic
| | - Torben L Lauridsen
- Department of Bioscience, Aarhus University, Vejlsøvej 25, 8600 Silkeborg, Denmark
| | - Peeter Nõges
- Centre for Limnology, Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 5, 51014 Tartu, Estonia
| | | | - Tomas Virbickas
- Nature Research Centre, Akademijos 2, LT-08412 Vilnius-21, Lithuania
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Virbickas T, Stakėnas S, Steponėnas A. Impact of beaver dams on abundance and distribution of anadromous salmonids in two lowland streams in Lithuania. PLoS One 2015; 10:e0123107. [PMID: 25856377 PMCID: PMC4391911 DOI: 10.1371/journal.pone.0123107] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2014] [Accepted: 02/27/2015] [Indexed: 11/24/2022] Open
Abstract
European beaver dams impeded movements of anadromous salmonids as it was established by fishing survey, fish tagging and redd counts in two lowland streams in Lithuania. Significant differences in abundancies of other litophilic fish species and evenness of representation by species in the community were detected upstream and downstream of the beaver dams. Sea trout parr marked with RFID tags passed through several successive beaver dams in upstream direction, but no tagged fish were detected above the uppermost dam. Increase in abundances of salmonid parr in the stream between the beaver dams and decrease below the dams were recorded in November, at the time of spawning of Atlantic salmon and sea trout, but no significant changes were detected in the sections upstream of the dams. After construction of several additional beaver dams in the downstream sections of the studied streams, abundance of Atlantic salmon parr downstream of the dams decreased considerably in comparison with that estimated before construction.
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Affiliation(s)
- Tomas Virbickas
- Department of Freshwater Biology, Nature Research Centre, Vilnius, Lithuania
| | - Saulius Stakėnas
- Department of Freshwater Biology, Nature Research Centre, Vilnius, Lithuania
| | - Andrius Steponėnas
- Department of Freshwater Biology, Nature Research Centre, Vilnius, Lithuania
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11
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Affiliation(s)
- Tomas Virbickas
- a Institute of Ecology , Akademijos 2, 2600 , Vilnius , Lithuania
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Affiliation(s)
- Vytautas Kesminas
- a Institute of Ecology of Vilnius University , Akademijos 2, 2600 , Vilnius , Lithuania
| | - Tomas Virbickas
- a Institute of Ecology of Vilnius University , Akademijos 2, 2600 , Vilnius , Lithuania
| | - Rimantas Repečka
- a Institute of Ecology of Vilnius University , Akademijos 2, 2600 , Vilnius , Lithuania
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Affiliation(s)
- Tomas Virbickas
- a Institute of Ecology of Vilnius University , Akademijos 2, LT-08412 , Vilnius-21 , Lithuania
| | - Gaudenta Sakalauskienė
- b Environmental Protection Agency , Ministry of Environment , Juozapavičiaus 9, LT-09311 , Vilnius-2 , Lithuania
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Affiliation(s)
- Gražina Balkuvienė
- a Institute of Ecology of Vilnius University , Akademijos 2, 2600 , Vilnius , Lithuania
| | - Vytautas Kesminas
- a Institute of Ecology of Vilnius University , Akademijos 2, 2600 , Vilnius , Lithuania
| | - Tomas Virbickas
- a Institute of Ecology of Vilnius University , Akademijos 2, 2600 , Vilnius , Lithuania
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Kesminas V, Virbickas T, Stakėnas S. The State and Morphological Characteristics of Vimba (Vimba Vimba L.) Subpopulation in the Middle Nemunas. ACTA ACUST UNITED AC 2012. [DOI: 10.1080/13921657.1999.10512271] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Abstract
Reproductive interaction between sympatric lampreys and salmonids was studied. The superimposition of brown trout Salmo trutta redds by spring-spawning river lamprey Lampetra fluviatilis and brook lamprey Lampetra planeri was examined in a small lowland stream of western Lithuania. A high superimposition rate of S. trutta redds by both L. fluviatilis (up to 83%) and L. planeri (up to 48%) was found, when the spawning intensity of Lampetra spp. was high. The occurrence of this phenomenon is the result of the overlap in the spawning habitat preferences at the reach-scale and at the microhabitat scale for the three species. One of the main requirements for Lampetra spp. spawning site selection was the negative streambed slope, an essential trait of the pool-riffle transitional zone. The structure of the salmonid redd created a considerable negative microhabitat slope suitable for Lampetra spp. spawning, which put the redds under a higher susceptibility to be superimposed. The timing of Lampetra spp. spawning overlapped closely with the emergence of S. trutta fry, suggesting a probable ecological effect of superimposition on S. trutta in the pre-emergent and emerging stages.
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Affiliation(s)
- N Nika
- Coastal Research and Planning Institute, Klaipėda University, H. Manto 84, LT-92294, Klaipėda, Lithuania.
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