Limnologica最新文献

{"title":"Movement behaviour and fishway performance for endemic and exotic species in a large anthropized river","authors":"Michaël Ovidio,&nbsp;Arnaud Dierckx,&nbsp;Jean-Philippe Benitez","doi":"10.1016/j.limno.2023.126061","DOIUrl":"10.1016/j.limno.2023.126061","url":null,"abstract":"<div><p>Studies of fishway performance, at the multi-species level in large rivers, are scarce and this raises the question of the passage success of both endemic and exotic species in anthropised environments. The study was conducted in the downstream part of the River Meuse (average annual discharge = 400 m³.s^-1) on a 13 km transect between two successive fishways (M₀ and M₁). From 2015–2021, a total of 1065 adult individuals, representing 14 large potamodromous (including asp <em>Aspius aspius</em> and catfish <em>Silurus glanis</em> as exotics) and diadromous species, were captured at the trap of the Lixhe fishway (M₀), individually tagged (using biocompatible RFID tags-Radio Frequency Identification), and released upstream of M_0. To analyse the performance of the M₁ vertical slot fishway using standardised metrics, a RFID detection station was placed with one antenna at the entrance and one antenna at the most upstream pool of the M₁ fishway (5.7 m height 18 pools). With 456 individuals detected in the M₁ fishway, the ascending rate from M₀ to M₁ was 42.8% (the common bream, <em>Abramis brama</em> achieving the best performance with 85.7%); the exotic species (catfish and asp) reached 21.5% and 30.5%, respectively. The adjusted passage performance was the best for the exotic asp (94.9%) followed by the trout, <em>Salmo trutta</em> (90.0%). The median time to cross the M₁ fishway was shorter for the trout (median = 01h08) and longer for the eel <em>Anguilla anguilla</em> (median = 21h17); the exotic asp was also very fast (median = 1h31). The hourly passage time at M₁ was variable, with some species migrating during daylight, dark periods or the entire 24 h cycle. The multispecies vertical slot fishway studied presented the best performance, in terms of passage success, at an international level, associated with good transit times. It also allows the passage of exotic species, which will increase their expansion area.</p></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47720399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Community-level physiological profiles in biofilms from streams differently affected by a volcanic eruption","authors":"Verónica Díaz Villanueva,&nbsp;Uara Carrillo,&nbsp;Beatriz Modenutti","doi":"10.1016/j.limno.2023.126055","DOIUrl":"10.1016/j.limno.2023.126055","url":null,"abstract":"<div><p>Volcanic eruptions are catastrophic events that allow testing different impacts on the ecosystems. Inputs of volcanic sediments into stream water may lead to drastic changes in the biota; however, the effects on biofilm functional traits remain poorly understood. This field study aimed to evaluate differences in structural and functional traits in the biofilm of streams differentially affected by the eruption of the Puyehue-Cordón Caulle Volcanic Complex (PCCVC, Chile, 2011). We examined differences in the structure (chlorophyll concentration, bacterial abundance, and biofilm organic matter and phosphorus content) and metabolic capacities (by use of Biolog EcoPlate™) in rock and sand biofilms from six streams with different distances from the volcanic source. Biofilms from streams near the volcano had higher phosphorus content and bacterial abundance. The Biolog EcoPlate™ indicated that there were differences in the use of some particular organic molecules among streams. On one hand, the use of substrate by biofilms from rocks and sand differed only in the non-affected streams. On the other hand, the biofilms of streams nearest the volcano were characterized by the use of galacturonic acid and this higher consumption can be related to the dominance of cyanobacteria. Our results suggest that volcanic sediment inputs, still occurring three years after the eruption, change biofilm communities, leading to physiological differences among streams.</p></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46883041","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Eutrophication as a homogenizer process of phytoplankton β-diversity in lowland streams","authors":"Diego Frau ,&nbsp;Alfonso Pineda ,&nbsp;Gisela Mayora ,&nbsp;María Florencia Gutierrez","doi":"10.1016/j.limno.2023.126058","DOIUrl":"10.1016/j.limno.2023.126058","url":null,"abstract":"<div><p>Phytoplankton diversity was assessed in subtropical lowland streams in two regions (<em>Espinal</em> and <em>Islas</em>) with different land uses to determine if eutrophication homogenized diversity. We sampled phytoplankton and took relevant information on several environmental variables across twelve streams in two sampling periods (April and November). We partitioned the β-diversity into its components (richness difference and turnover) to describe the diversity variation. Furthermore, we performed redundancy analyses and regression models to approach the relevance of environmental and spatial variables (geographical distance) on such variation. We identified low β-diversity values, and turnover was the dominant component of β-diversity for both regions. In the most eutrophic region (<em>Espinal</em>), eutrophication (inferred from total phosphorus concentration) appeared as a homogenizing process of total β-diversity while in the less eutrophic (<em>Islas</em>), variations in soluble reactive phosphorus among sites appeared as the main driver. The turnover component at both regions was regulated by other processes (e.g., biological oxygen demand and temperature). We conclude that eutrophication acts as a homogenizing process of phytoplankton β-diversity in lowland streams linked to agriculture (<em>Espinal</em>). Still, it is not the same on <em>Islas</em>, where other factors not revealed in this study could determine low β-diversity values.</p></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44873230","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hydromorphological preferences of freshwater pearl mussel (Margaritifera margaritifera) in upland streams of the Bavarian Forest – A case study","authors":"Marco Denic ,&nbsp;Michael Kuehneweg ,&nbsp;Thomas Schmidt","doi":"10.1016/j.limno.2022.126034","DOIUrl":"10.1016/j.limno.2022.126034","url":null,"abstract":"<div><p>The freshwater pearl mussel is a highly specialized freshwater bivalve. In four pearl mussel streams located in the Bavarian Forest, hydromorphological microhabitat conditions were investigated in mussel colonized and adjacent non-colonized river stretches to describe hydromorphologic preferences of freshwater pearl mussel. For that purpose, tachymetry, flow velocity and substratum composition were investigated. Hydraulic-numerical models were calculated to predict flow velocities, maximal shear stress and substratum stability under different discharge scenarios. Results indicate that pearl mussels prefer river stretches with certain minimal currents during low flow but at the same time stable substrata even during bankfull discharge. Implications for habitat restoration and release of juvenile mussels from breeding programs are discussed.</p></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48209462","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fish ecology and sediment conditions in freshwater pearl mussel (M. margaritifera) habitats","authors":"Sarah Höfler ,&nbsp;Clemens Gumpinger ,&nbsp;Ondřej Spisar ,&nbsp;Robert Ouřednik ,&nbsp;Christoph Hauer","doi":"10.1016/j.limno.2023.126060","DOIUrl":"10.1016/j.limno.2023.126060","url":null,"abstract":"<div><p>Stable, healthy populations of locally adapted brown trout (<em>Salmo trutta</em>) are crucial for the reproduction of the freshwater pearl mussel (<em>Margaritifera margaritifera</em>), as they serve as host fish in its life cycle. In the Interreg project Malšemuschel at the river Maltsch/Malše the hydro-morphology and sediment conditions were analysed regarding their influence on the biocoenoses of rhithral waters on granitic bedrock. In this paper, the fish fauna is highlighted in particular. It could be shown that sand on the one hand and finer fractions on the other impair watercourses and their fish fauna in different ways. While an increase in fine sediments (clay, silt) causes shifts in species compositions and leads to a steady decrease in abundances, sand rather influences the hydromorphology by reducing pools, flattening out the river bed and covering structures. Thus, sand seems to more directly influence the biomass and to cause a sharp deterioration of the fish fauna when a certain threshold is exceeded. Furthermore, it could be shown that brown trout populations are strongly related to the presence of natural structures e.g. large boulders or riparian vegetation.</p></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44297846","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design and functionality of sedimentation areas – Targeted lowering of floodplains to improve the habitat quality and flood safety by removing high loads of fine sediments","authors":"Stefan Auer,&nbsp;Sarah Höfler,&nbsp;Daniel Daill,&nbsp;Clemens Gumpinger","doi":"10.1016/j.limno.2022.126050","DOIUrl":"10.1016/j.limno.2022.126050","url":null,"abstract":"<div><p>In many rivers of the Bohemian Massif in Northern Upper Austria, an increase in sediment loads can be observed, which has a negative impact on food safety and the habitat quality for aquatic organisms. To protect endangered species, measures must be taken to preserve natural aquatic habitats. Nature-based measures are well suited for improving the sediment balance of streams. Sediment deposition can be forced through the targeted lowering of a riparian plain. On these so-called sedimentation areas, sand and fine sediments in particular are removed from the watercourse. This locally improves the composition and morphology of the riverbed and restores important structures for aquatic organisms. The present work deals with the implementation of nine sedimentation areas and the verification of their functionality. The implementation of sedimentation areas requires technical requirements and the involvement of property owners, operators and authorities. To investigate the sediment budget, the removals from the sedimentation areas were documented. For the evaluation of the riverbed structure, surveys of the substrate composition and the morphology were carried out in several transects. The results show that even on small sedimentation areas significant amounts of sand and fine sediments are deposited. Furthermore sedimentation areas locally lead to an improvement of habitat conditions in the watercourse and can thus contribute to the conservation of endangered species. As the positive effects of sedimentation areas are locally limited, for far-reaching effects the implementation of several sedimentation areas in a watercourse section is required.</p></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45033145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Association of landscape and environmental variables with the recruitment of the freshwater pearl mussel (Margaritifera margaritifera) in Norway","authors":"Marie-Pierre Gosselin ,&nbsp;Sebastian Wacker ,&nbsp;Jon H. Magerøy ,&nbsp;Anders Foldvik ,&nbsp;Bjørn M. Larsen","doi":"10.1016/j.limno.2022.126031","DOIUrl":"10.1016/j.limno.2022.126031","url":null,"abstract":"<div><p>Using data from 309 localities with freshwater pearl mussel, <em>Margaritifera margaritifera</em>, in Norway, we analyzed the effect of several landscape and environmental variables on this species’ recruitment. Median summer air temperature and, to a lesser extent, percentage wetland cover in the catchment were the strongest (negative) influences on recruitment. This is the first study to show an effect of air temperature on recruitment across a wide range of populations. The results are of importance for the conservation of the species, particularly in the context of climate change.</p></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42911666","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Wullowitz-Lakes theory: Periglacial impacts on river morphology and habitat suitability for the endangered freshwater pearl mussel","authors":"C. Hauer ,&nbsp;P. Flödl ,&nbsp;S. Stelzer ,&nbsp;T. Mayer ,&nbsp;S. Höfler ,&nbsp;F. Ottner","doi":"10.1016/j.limno.2022.126007","DOIUrl":"10.1016/j.limno.2022.126007","url":null,"abstract":"<div><p>The Malše River, on the border between Austria and the Czech Republic, contains one of the last remaining freshwater pearl mussel (<em>Margaritifera margaritifera</em>) populations on the Bohemian Massif. Evidence from field studies indicated that landscape evolutionary processes changed the boundary conditions for river channel formations, especially in those parts where the remaining mussels, probably also self-reproducing to a limited extent, were documented. The aim of the present work was to study these possible palaeo-impacts through (i) the analysis of the terrain data and accompanying hydrodynamic-numerical modelling and (ii) sediment sampling of the main channel and the surrounding floodplains at the reach and catchment scales. The results indicated that solifluction caused a historic blockage in the drainage area with consequent formation of lakes in the upstream part of these obstructions. At least two sites where this “Wullowitz-Lakes Theory” can be applied were identified. The occurrence of these lakes was validated by sediment analysis. The findings further indicated that the later fluvial processes in these deposits of a former stagnant water body forced the formation of an anabranching channel in the system, which would not have occurred in a solely freely developed fluvial system. In conclusion, it could be determined that the consideration of palaeo-processes might be important even for present onsite assessments of aquatic habitats and species such as the endangered freshwater pearl mussel.</p></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43594828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ecological assessment of high sediment loads based on macroinvertebrate communities in the Bohemian Massif in Austria – A sensitivity analysis","authors":"P. Leitner ,&nbsp;W. Graf ,&nbsp;C. Hauer","doi":"10.1016/j.limno.2021.125941","DOIUrl":"10.1016/j.limno.2021.125941","url":null,"abstract":"<div><p>Sediment dynamics and composition in streams are key factors influencing the habitat quality of aquatic organisms, consequently playing an important role in terms of river restoration. The superposition of the river-bed with fine sediments is an increasing global stressor affecting local habitat diversity and leading to changes of benthic communities. We analysed benthic macroinvertebrates in five streams of the Bohemian Massif from morphologically unaffected reference sites, and impacted sites influenced by fine sediment deposition (D = 1 mm – 10 mm) of different intensity. Siltation resulted in a gradually decline in biodiversity, abundance and biomass of macroinvertebrates linked with increasing fine sediment deposition. While for reference sites, dominated by coarse substrates, a specific community was allocated, no characteristic fauna was identified for the impacted sites. However, the results of the EU Water Framework Directive compliant Austrian national method for assessing the ecological status did not react accordingly. Solely streams highly impacted by fine sediment deposition in combination with low river-bed heterogeneity and non-natural riparian conditions indicated status shifts. Based on positive faunal responses to micro-habitats such as woody debris we recommend to support the introduction of small-scaled river restorations and anthropogenic initiated river-type specific stable structural elements (e.g. large stones) serving as refugial habitats, which can result in a significant improvement of macroinvertebrate diversity and composition.</p></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44106630","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Meadows and mussels – The relationship between historical irrigation systems and the habitat of the freshwater pearl mussel Margaritifera margaritifera (L.)","authors":"Julia Sattler,&nbsp;Sabine Fischer,&nbsp;Peter Poschlod","doi":"10.1016/j.limno.2022.125994","DOIUrl":"10.1016/j.limno.2022.125994","url":null,"abstract":"<div><p>Conceptual meadow irrigation is a historically prominent land use practice, that contributed decisively to the landscape. It enhances land-water-connectivity and might directly interact with habitats of <em>Margaritifera margaritifera</em> (L.). The aim of the presented study was to investigate, if there is a spatial correlation in the distribution of conceptual meadow irrigation and <em>M. margerigtifera</em>. We therefore digitalized the distribution of both in the German Federal Republic in GIS. This revealed a 68% overlap of map quarters with records of the Freshwater Pearlmussel with those, where conceptual meadow irrigation was practiced. With our findings we want to draw the readers attention to the potential of this land use practice for ecosystem functioning.</p></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43381728","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}