Limnologica最新文献

{"title":"Determination of particle-bound nutrients and micropollutants concentrations and loads in small rivers – A novel sampling method","authors":"P. Flödl ,&nbsp;A. Amann ,&nbsp;S. Stelzer ,&nbsp;T. Mayer ,&nbsp;O. Zoboli ,&nbsp;C. Hauer","doi":"10.1016/j.limno.2022.125991","DOIUrl":"10.1016/j.limno.2022.125991","url":null,"abstract":"<div><p>Pollutants and excessive nutrient inputs into rivers pose a problem for aquatic ecosystems. Humans are also at risk when these substances enter the food chain via drinking water supplies and food. Water quality monitoring and research on pollutant transport are important components for protecting humans and endangered species. Since there are few ready and easy-to-use suspended sediment samplers for small streams and usually low pollutant concentrations, there is little information on pollutant transport in such small streams. However, research is essential to protect highly endangered species such as the freshwater pearl mussel “<em>Margaritifera margaritifera</em>”. This publication, therefore, aims to present a new method for collecting suspended sediments even in small rivers. The sampler presented corresponds to an adapted bed load trap, with a considerably reduced mesh size of the sampler, so that sediments smaller than 2 mm can be collected. After hydraulic pre-tests, sediment samples were collected at six sampling points with the new sampler over a time period of two weeks. In addition, sediments were taken from the river bed for a comparison between mobile sediments and deposits. The sediments were analysed for selected chemical micropollutants and phosphorus availability was checked by phosphorus fractionation. The observed mechanical-biological clogging of the mesh occurs in the first 72 h, depending on the river stretch. This effect can also be observed at other samplers and usually prevents the collection of suspended sediment. However, with this new sampler concept, clogging is advantageous. Due to the partial clogging of the mesh, water can continue to flow through, but finer sediment particles are retained in the sampler. Results show that the sampler collects sufficient sample volumes even in small rivers with low bed gradients and low flow velocities. The samplers also ensure sediment sampling over a defined time period (2 weeks in this study). The presented suspended sediment sampler method can help to understand nutrient and pollutant transport better, even in small streams. These findings can improve the knowledge on underlying processes, which will help to protect endangered species such as the 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":"43504992","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":"Visitor pressure in protected areas: Interactions between river tourists and freshwater pearl mussels in the Central European national park Šumava","authors":"Vojtěch Barák ,&nbsp;Christoph Hauer ,&nbsp;Ondřej Simon ,&nbsp;Peter Flödl","doi":"10.1016/j.limno.2022.126046","DOIUrl":"10.1016/j.limno.2022.126046","url":null,"abstract":"<div><p>The freshwater pearl mussel <em>Margaritifera margaritifera</em> (FPM) is an endangered bivalve species occurring in oligotrophic rivers. FPMs can be found in the Upper Vltava River in the Šumava National Park (Czech Republic, Central Europe), where suitable conditions exist for both adult and juvenile mussels. Non-consumptive human leisure activities are known to negatively affect wildlife in fragile aquatic ecosystems, and in the Vltava River boating tourism in particular may be a threat to local mussel populations. This study focused on an assessment of interactions between river tourists and the FPM, using “pseudo-mussels” in both field and lab experiments. In the field, fake concrete mussels were exposed at three rest sites for river tourists, and in the lab experiment glued shells were placed at the water-sediment interface in an aquarium tested for mechanical impacts of paddles (dislodgement and crushing). Interactions of river tourists with fake mussels were most frequent at low water levels (10–20 cm), and within 2 m from the nearest river bank. Mussel visibility and the presence/absence of a guide played an important role in people´s reactions, but site-specific effects were also found. Unintentional interactions (60–69%) were mostly observed at less-attractive sites (with a limited area of shallow water where people spent most time outside the river channel), whereas visual and manipulative interactions (76%) dominated at a more-attractive site (the confluence of two rivers where people move across and inspect the river channel). Crash tests revealed that 8.03 ± 1.37 (mean±SD) and 7.88 ± 1.13 (mean±SD) hits by paddles were needed for dislodgment and crushing, respectively. Those findings indicate that the direct effects of recreational boating might be less detrimental than those of accompanying activities (such as wading, bathing, and swimming). The role of trampling (and handling) disturbances should be investigated in more detail to help conserve FPM populations in protected areas.</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":"43948361","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":"Beyond the European Water Framework Directive: Challenges and future needs for the preservation and conservation of freshwater pearl mussel habitats","authors":"Christoph Hauer ,&nbsp;Sophie Stelzer ,&nbsp;Sarah Höfler ,&nbsp;Clemens Gumpinger ,&nbsp;Peter Flödl","doi":"10.1016/j.limno.2023.126063","DOIUrl":"10.1016/j.limno.2023.126063","url":null,"abstract":"","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":"47181141","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":"Communication with local community and stakeholders as a key activity to protect oligotrophic streams with freshwater pearl mussel","authors":"Ivana Tycova,&nbsp;Robert Ourednik,&nbsp;Ondrej Spisar","doi":"10.1016/j.limno.2022.126048","DOIUrl":"10.1016/j.limno.2022.126048","url":null,"abstract":"<div><p>A complex approach in nature and species conservation is crucial for a real and persisting success of the costly work and effort. A combination of both direct support of the endangered species together with habitat restoration, and cooperation with community members and authorities, present and active within the species’ habitat, is a must. Nevertheless, the latter is often missing in nature conservation work, resulting in a lack of awareness and interest regarding the targeted species among the local population. Here we describe a plan, practice, and results of a complex information campaign aimed at public, local/regional authorities and stakeholders conducted over the period of four years in the catchment of the Malše river (Czech Republic). The campaign focused on the conservation of a rare aquatic mollusc, the freshwater pearl mussel <em>Margaritifera margaritifera,</em> living in streams with high water quality. The species serves as an umbrella species for the conservation of oligotrophic river catchments. The main goal of the campaign was the transfer of knowledge and transition to good management practice in agriculture, forestry, water and fish management. In our experience, the vast majority of stakeholders took part in the educative campaign and showed willingness to adjust their management work in order to protect freshwater pearl mussels. The role of a contact person was crucial, they provided advice to stakeholders and helped channel the communication with local authorities. We compare our experiences with other recent educative campaigns held in Europe, their effects, and their future challenges. We propose key activities in communication with the local community and stakeholders to enhance the impact of nature conservation.</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":"42713730","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":"Nature-based solutions in freshwater pearl mussel rivers – A novel approach for self-dynamic desanding developed in a physical model test","authors":"S. Stelzer ,&nbsp;D. Worf ,&nbsp;P. Flödl ,&nbsp;C. Sindelar ,&nbsp;S. Höfler ,&nbsp;C. Hauer","doi":"10.1016/j.limno.2022.126032","DOIUrl":"10.1016/j.limno.2022.126032","url":null,"abstract":"<div><p>In rivers of the Bohemian Massif, an unbalanced sediment regime in the form of a sediment surplus constitutes a growing problem. The dominant weathering grain size fractions (1–10 mm) are unsuitable habitats for, among others, freshwater pearl mussels (<em>Margaritifera margaritifera</em>), which occur in remaining populations in the Austrian part of the Bohemian Massif, the so-called Gneiss and Granite Plateau. In addition to ecological degradation, the above sediment surplus can also increase the flood risk in certain river stretches, which in turn often leads to frequent riverbed interventions (e.g., riverbed dredging). To transition from purely technical mitigation measures to near-natural solutions, the concept of nature-based solutions (NbS) represents an opportunity to mitigate ecological and flood risk issues. However, a comprehensive process understanding is necessary for effective measure planning. This study addressed the deficits in process understanding via physical model tests, in which a technically optimized NbS was developed for the natural process of self-dynamic desanding (SDD). SDD describes the deposition of sand and fine gravel on riverbanks or floodplains under high-flow conditions. The model tests demonstrated that in-stream measures could promote SDD by increasing the sediment output discharged from the river onto the floodplain. In addition, a set of measures was developed on a lowered floodplain, which resulted in optimized floodplain sedimentation under one-year flood conditions. Up to 14.7 % of the total transported sediments could be discharged.</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":"48258424","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":"Evidence of microplastics in the Chi River Basin, Thailand: Anthropogenic influence and potential threats to edible arthropods","authors":"Penkhae Thamsenanupap ,&nbsp;Tawatchai Tanee ,&nbsp;Jutamas Kaewsuk","doi":"10.1016/j.limno.2022.126030","DOIUrl":"10.1016/j.limno.2022.126030","url":null,"abstract":"<div><p><span><span>Microplastics (MPs) are an emerging pollutant in freshwater that have become a cause for concern among researchers around the world. In this study, MPs contamination in water, sediment and edible arthropods of the upper Chi River and Pong River was studied to analyze the influence of </span>anthropogenic activities on contamination in the river environments and arthropods. Five species of arthropods were observed to assess the impact of MPs contamination: </span><em>Caridina</em> sp, <span><em>Macrobrachium</em></span> sp., A<em>ethriamanta</em> sp., <em>Aciagrion</em> sp. and <em>Sphaerodema molestum</em>. MPs were found in water and sediment samples with an average of 141 items/m³<span><span> and 9.5 items/kg, respectively. Fibers were major MPs shape in water (63%) and sediment (81.9%). MPs with dark blue color were numerically dominant in water (28%) and sediment (39.6%). MPs in edible arthropods were in the range of 0.25 – 8.0 items/individual. A wider variety of polymer types was found in the rivers than in the edible arthropods. Overall, dark blue colored PP fibers were found to be the most abundant in water, sediment and edible arthropods with MPs mostly ranging 1000–2000 µm in size. MPs concentration in water correlated with community size (p-value &lt;0.05), and the abundance in sediment correlated with the number of roofs (p-value &lt;0.05) and the distance of the rivers from communities (p-value &lt;0.05). Anthropogenic activities significantly contributed to abundance of MP in water and sediment. Industrial, community and fish farming contributed to MP in water and </span>agriculture and community directly correlated with MP in sediment with p-value &lt;0.05 at 95% confidence. The results indicate the significant influence of anthropogenic activities on the amount of MPs in water and sediment, directly relating to contamination in edible arthropods. Domestic wastewater and plastic waste are likely to be the leading causes of existing MPs in the rivers and arthropods.</span></p></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48425351","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 ecology of the zooplankton in Mexican inland waters: What we know so far","authors":"Alcocer Javier ,&nbsp;Espinosa-Rodríguez Cristian Alberto ,&nbsp;Fernández Rocío ,&nbsp;Lugo-Vázquez Alfonso ,&nbsp;Macek Miroslav ,&nbsp;Maeda-Martínez Alejandro M ,&nbsp;Martínez-Jerónimo Fernando ,&nbsp;Ortega-Mayagoitia Elizabeth ,&nbsp;Oseguera Luis A","doi":"10.1016/j.limno.2022.126037","DOIUrl":"10.1016/j.limno.2022.126037","url":null,"abstract":"<div><p>The varied physiography and climate of the Mexican territory have produced a large mosaic of inland aquatic ecosystems<span><span><span>. However, zooplankton ecology has been studied mainly from the water bodies of Central (Trans Mexican Volcanic Belt), eastern (the Yucatán Peninsula), and southern Mexico. In contrast, the zooplankton from the Mesa Central water bodies has been insufficiently investigated. After a long history of zooplankton taxonomic studies, the first contributions to the zooplankton ecology dated to the 1990 s, rapidly increasing afterward. Most ecological information arises from field investigations and experiments under laboratory conditions, lacking mesocosms and whole-lake experiments. In the same way, the studies have been carried out in lentic, natural, and artificial water bodies, primarily eutrophic. Differently, the zooplankton ecology of </span>lotic ecosystems is largely unknown. Here we summarized the progress made in the study of the zooplankton ecology of Mexican </span>inland waters, revealing the most important research topics developed so far.</span></p></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44950556","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":"Hidden shelter-like associations of minute Alboglossiphonia leeches (Hirudinea: Glossiphoniidae) with sedentary animals and molluscs","authors":"Ivan N. Bolotov ,&nbsp;Tatyana A. Eliseeva ,&nbsp;Alexander V. Kondakov ,&nbsp;Ekaterina S. Konopleva ,&nbsp;Dmitry M. Palatov ,&nbsp;Agniya M. Sokolova ,&nbsp;Ilya V. Vikhrev ,&nbsp;Mikhail Y. Gofarov ,&nbsp;Galina V. Bovykina ,&nbsp;Nyein Chan ,&nbsp;Zau Lunn ,&nbsp;Than Win","doi":"10.1016/j.limno.2022.126028","DOIUrl":"10.1016/j.limno.2022.126028","url":null,"abstract":"<div><p><span>Freshwater leeches are a diverse group of annelid worms, some of which may serve as endosymbionts<span> of various freshwater invertebrates, being commensals and parasites. However, the nature of such hidden associations is poorly understood. Here, we describe the first record of a freshwater leech – sponge association ever discovered. A small fragment of an unidentified and probably new freshwater sponge species (Porifera: Spongillidae) from India was heavily infested by numerous juvenile leeches </span></span><em>Alboglossiphonia pahariensis</em><span> Nesemann &amp; Sharma, 2007 (Hirudinea: Glossiphoniidae), which were found in chironomid larvae (Diptera: Chironomidae: </span><em>Xenochironomus</em> sp.) burrows, penetrating the sponge’s body. The taxonomic identification of the leech was confirmed by means of an integrative approach combining morphological and DNA-based evidence. Furthermore, we present a finding of <em>Alboglossiphonia bhamoensis</em> <strong>sp. nov.</strong><span> from the mantle cavity of a freshwater mussel species in Myanmar. These new records are discussed within a broader ecological and evolutionary context based on a review of the body of available literature on hidden shelter-like and parasitic associations of leeches with gastropods, bivalves, and sedentary animals in freshwater environments.</span></p></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45002773","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":"Analysis of multiple-pressure pattern in rivers and its effects on the structure of macroinvertebrate communities","authors":"Martin Hroch ,&nbsp;Karel Brabec","doi":"10.1016/j.limno.2022.126027","DOIUrl":"10.1016/j.limno.2022.126027","url":null,"abstract":"<div><p><span><span>Natural and anthropogenic factors form stream </span>macroinvertebrate communities depending on their combination, intensity, and spatial pattern. The study aimed to identify macroinvertebrate indicators that respond to land cover, hydromorphology, and wastewater releases individually and to their multiple-pressure pattern. Environmental and macroinvertebrate data from 36 sites were used in the study. Pressure parameters representing hierarchy of their complexity and spatial scale were included in analyses. Correlation analyses were used for evaluation of relationships among pressure characteristics and also pressure–macroinvertebrate relationships. The pressure-based and biological classification of sites was compared and indicator taxa were identified. The </span>arable land<span> in the sub-corridor extending 2–10 km upstream of an investigated site was the main pressure factor influencing the structure of macroinvertebrate communities in the studied streams. The biological effects of small-scale land cover were followed by catchment-scale land cover and hydromorphology. Almost no association of macroinvertebrates with the risk of point source pollution were detected. Classifications based on pressures and community composition corresponded only by the separation of most degraded sites from others. Among the macroinvertebrate indicators characterizing the severe impairment threshold, chironomids and oligochaetes dominated. Different responses of macroinvertebrates to hydromorphological degradation were observed under conditions of high small- and large-scale agricultural pressures (decrease in macroinvertebrate evenness and increase in oligochaete taxa richness, respectively). Linking biological indicators to pressure components and their combinations improves the efficiency of conservation and restoration strategies applied in fluvial ecosystems.</span></p></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44206649","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":"Cross boundary fluxes: Basal resource use by aquatic invertebrates matches fatty acid transfers from river to land","authors":"Sydney Moyo ,&nbsp;Nicole B. Richoux","doi":"10.1016/j.limno.2022.126035","DOIUrl":"10.1016/j.limno.2022.126035","url":null,"abstract":"<div><p><span><span>Emerging insects transfer valuable lipids originating in aquatic food sources to terrestrial consumers. The objective of this study was to determine how the export of physiologically important fatty acids from a river to adjacent land via insect emergence relates to the type and quality of the aquatic food consumed, and which emerging insects were primarily responsible for these fluxes. We ran mixing models and hypervolumes incorporating stable carbon isotope ratios<span> of basal resources and emergent invertebrates to determine the major contributors to insect larvae diets. Our data revealed that aquatic food sources (epiphyton, </span></span>epilithon<span> and suspended particulate matter) were the major organic matter sources (&gt; 50 %) supporting consumers (Diptera, Ephemeroptera, </span></span>Odonata<span><span> and Trichoptera), with allochthonous food sources (C3 plants) being of importance at upstream sites. We calculated fluxes of highly unsaturated fatty acids (HUFAs) via emerging insects and found that these corresponded with the spatial and temporal patterns in the nutritional quality of these same basal resources in the river (quality measured as concentrations of HUFAs). These patterns provide evidence of a direct coupling between food quality and trophic subsidy fluxes from water to land, particularly by emergent </span>dipterans and ephemeropterans.</span></p></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48595542","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}