Limnologica最新文献

Cryptic invasion and intraspecific hybridisation in the freshwater snail Theodoxus fluviatilis in the river Rhine

IF 2 4区环境科学与生态学

Limnologica Pub Date : 2025-03-22 DOI: 10.1016/j.limno.2025.126247

Hans-Peter Rusterholz, Bruno Baur

{"title":"Cryptic invasion and intraspecific hybridisation in the freshwater snail Theodoxus fluviatilis in the river Rhine","authors":"Hans-Peter Rusterholz, Bruno Baur","doi":"10.1016/j.limno.2025.126247","DOIUrl":"10.1016/j.limno.2025.126247","url":null,"abstract":"<div><div>Intraspecific cryptic invasion involves the spread and establishment of non-native genetic lineages within the species’ native range. Individuals of non-native lineages can displace native individuals or hybridise with them. Hybridisation homogenises unique characteristics of geographically distinct populations and thus reduces the potential for future species diversity. In Europe, the freshwater snail <em>Theodoxus fluviatilis</em> has different haplotypes depending on the geographically separated water system. Since 2005, an upstream spread of <em>T. fluviatilis</em> with haplotype F31, which originates in the Ponto-Caspian region, has been recorded in the Danube and later in the river Rhine in Germany. Shortly after the invasion of snails with non-native haplotype, we collected 301 individuals of <em>T. fluviatilis</em> from 11 locations in the Upper and High Rhine. We used a mitochondrial marker (COI) for the determination of the snails’ haplotype: 19 individuals belonged to the native haplotype F28 (6.3 %), 159 (52.8 %) to the non-native haplotype F31 and 123 (40.9 %) to another non-native haplotype “euxinus” (also of Ponto-Caspian origin). Using eight microsatellites we examined whether individuals of the invading non-native haplotypes hybridise with individuals of the native haplotype F28. We found 12 hybrids (4.0 %) among the 301 snails examined. Hybrids occurred in 7 out of the 11 populations examined. We provide evidence that hybrids with the native haplotypes occur as early as the first 1–2 generations after the invasion of the non-native haplotypes. This indicates that the native haplotype of <em>T. fluviatilis</em> is unlikely to persist in the High Rhine in the long term.</div></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"112 ","pages":"Article 126247"},"PeriodicalIF":2.0,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143697337","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}

引用次数: 0

It’s getting tight – How colmation influences the sediment fauna and why we might fail in restoring our streams

IF 2 4区环境科学与生态学

Limnologica Pub Date : 2025-03-20 DOI: 10.1016/j.limno.2025.126246

Teresa Luftensteiner , Alcides Aybar Galdos , Markus Noack , Holger Schindler , Heide Stein , Hans Jürgen Hahn

{"title":"It’s getting tight – How colmation influences the sediment fauna and why we might fail in restoring our streams","authors":"Teresa Luftensteiner , Alcides Aybar Galdos , Markus Noack , Holger Schindler , Heide Stein , Hans Jürgen Hahn","doi":"10.1016/j.limno.2025.126246","DOIUrl":"10.1016/j.limno.2025.126246","url":null,"abstract":"<div><div>Restoration of streams to a good ecological status, as required by the European Water Framework Directive (WFD), has been slow, if not failing. Colmation, the clogging of hyporheic interstices by fine sediments, could be one cause for this failure by negatively influencing hyporheic invertebrates. Therefore, this study analysed the hyporheic communities in six German rivers representing all five ecological status classes using ecological, colmation- and grain size analysis. The study revealed that I) the amount of fine sediment and level of colmation had a significant impact on the taxa number and the abundance of hyporheic meiofauna, II) increased colmation led to a shift from coarse- to fine sediment dweller-dominated hyporheic communities, III) hyporheic communities were impacted most by land use in catchments, fine sediment levels, and colmation, and IV) faunal patterns associated with colmation corresponded to the ‘general degradation’ classification defined by the WFD. Presumably elevated fine sediment loads from open land use types, and thereby increasing colmation-levels, altered the porosity and the size of voids. This led to a loss of habitats within the sediments which influenced hyporheic invertebrates. While substrate conditions are important for benthic communities, they are especially critical for hyporheic fauna, which responds particularly strongly to changes in sediment structure. Oxygen and nutrient provision are influenced by sediment structure and further impact the hyporheic organisms. Consequently, the loss of functioning communities led to the deterioration of the ecological status of rivers. Colmation should therefore be considered when implementing the WFD.</div></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"112 ","pages":"Article 126246"},"PeriodicalIF":2.0,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143684448","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Differences in community structuring among planktonic bacterial and micro-eukaryotic phyla in Chilean freshwater lakes

IF 2 4区环境科学与生态学

Limnologica Pub Date : 2025-03-01 DOI: 10.1016/j.limno.2025.126233

Maxime Sweetlove , Bjorn Tytgat , Evelien Van de Vyver , Elie Verleyen , Sofie D‘hondt , Dagmar Obbels , Moritz Buck , Roberto Urrutia , Stefan Bertilsson , Wim Vyverman

{"title":"Differences in community structuring among planktonic bacterial and micro-eukaryotic phyla in Chilean freshwater lakes","authors":"Maxime Sweetlove , Bjorn Tytgat , Evelien Van de Vyver , Elie Verleyen , Sofie D‘hondt , Dagmar Obbels , Moritz Buck , Roberto Urrutia , Stefan Bertilsson , Wim Vyverman","doi":"10.1016/j.limno.2025.126233","DOIUrl":"10.1016/j.limno.2025.126233","url":null,"abstract":"<div><div>The effect of spatial factors reflecting dispersal potential between sites versus local environmental conditions on freshwater planktonic communities remains poorly understood. We assessed differences in the relative importance of local and seasonal environmental conditions versus spatial factors in explaining differences in community composition (i.e., beta-diversity patterns) in microbial plankton of 39 mid-latitude Chilean lakes spanning representative ecological gradients in altitude, mixing depth and water chemistry. The assemblages were taxonomically profiled by paired-end high throughput sequencing of the V3-V4 region of the 16S and the V4 region of the 18S rRNA genes. Variation partitioning analyses revealed that the explanatory power of environmental and seasonal factors versus spatial variables and their mutual overlap varied considerably among taxa and functional groups. More than 12 % of the variation in community structure was uniquely explained by environmental factors in the phytoplankton groups Dinophyta, Ochrophyta and Cyanobacteria, as well as in oligotrophic ultramicrobacteria, such as small rhodopsin containing Actinobacteria and LD12 Alphaproteobacteria. In phago-heterotrophic and saprotrophic groups, including heterotrophic micro-eukaryotes, and Bacteroidetes, environmental factors explained a smaller or even insignificant portion of the differences in the community structure. Our findings suggest that in Chilean lake microplankton, complex traits related to ecological and trophic strategy appear to affect the relative effect of local environmental properties on their community composition and hence the strength of species sorting along limnological gradients.</div></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"111 ","pages":"Article 126233"},"PeriodicalIF":2.0,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143511778","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}

引用次数: 0

Multi-year movements of potamodromous cyprinid species within a highly anthropized river assessed using RFID-equipped fishways

IF 2 4区环境科学与生态学

Limnologica Pub Date : 2025-02-28 DOI: 10.1016/j.limno.2025.126236

Stéphane Tétard , Anthony Maire , Michaël Ovidio , Jean-Philippe Benitez , Frédéric Schaeffer , Marie Coll , Romain Roy

{"title":"Multi-year movements of potamodromous cyprinid species within a highly anthropized river assessed using RFID-equipped fishways","authors":"Stéphane Tétard , Anthony Maire , Michaël Ovidio , Jean-Philippe Benitez , Frédéric Schaeffer , Marie Coll , Romain Roy","doi":"10.1016/j.limno.2025.126236","DOIUrl":"10.1016/j.limno.2025.126236","url":null,"abstract":"<div><div>Movements of potamodromous fish are poorly understood, especially in large rivers, because studies often focus on fishway evaluation and diadromous species. Here, we assessed the movements of 808 fish of five potamodromous species (Barbel, <em>Barbus barbus</em>; Common bream, <em>Abramis brama</em>; Nase, <em>Chondrostoma nasus;</em> Asp, <em>Leuciscus aspius</em> and chub <em>Squalius cephalus</em>) over 14 years in a highly anthropized river system, the Rhine River, where hydropower plants were progressively equipped with fishways including RFID antennas. The objectives of the study were 1) to characterize long-term and large-scale individual movement patterns of five potamodromous fish species 2) to assess inter- and intra-specific variations based on quantitative movement metrics and 3) to create a typology of individuals based on their movements. Results showed that, despite high intra-specific variability, the inter-specific differences were strong enough to highlight long-term and large-scale species-specific behaviors. Breams exhibited movements that occurred essentially during spawning migration period and at the reach scale. In contrast, barbels were more active, with more movements outside their spawning migration period, showed more large-scale and downstream movements, and used navigation locks more often than other species. For this species, the maximum distance between the two furthest recorded positions at the basin scale was exceptionally high (max = 155 km). We conclude that potamodromous species undoubtedly perform large-scale movements, which are characterized by both species-specific and common features. Therefore, efforts need to be made to better consider their ecological needs and swimming capabilities when planning and designing effective fishways for the diverse range of species that move within river systems.</div></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"112 ","pages":"Article 126236"},"PeriodicalIF":2.0,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143592541","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Stable isotope analysis reveals inter- and intraspecific trophic relationships of the endangered Central American river turtle in southern Mexico

IF 2 4区环境科学与生态学

Limnologica Pub Date : 2025-02-26 DOI: 10.1016/j.limno.2025.126238

Eduardo Reyes-Grajales , Matteo Cazzanelli , Nora P. López-León , Alejandra Sepúlveda-Lozada , Luis Antonio Muñoz Alonso , Miriam Soria-Barreto , Rocío Rodiles-Hernández

{"title":"Stable isotope analysis reveals inter- and intraspecific trophic relationships of the endangered Central American river turtle in southern Mexico","authors":"Eduardo Reyes-Grajales , Matteo Cazzanelli , Nora P. López-León , Alejandra Sepúlveda-Lozada , Luis Antonio Muñoz Alonso , Miriam Soria-Barreto , Rocío Rodiles-Hernández","doi":"10.1016/j.limno.2025.126238","DOIUrl":"10.1016/j.limno.2025.126238","url":null,"abstract":"<div><div>Trophic ecology studies enhance our understanding of species relationships within communities and ecosystems, providing critical information for conservation programs targeting endangered species. The Central American river turtle (<em>Dermatemys mawii</em>) is one of the most critically endangered testudine species worldwide, yet its trophic ecology has been scarcely studied. Based on stable isotope analysis (<em>δ</em><sup>13</sup>C and <em>δ</em><sup>15</sup>N), we applied community-wide metrics and stable isotope mixing models to assess the intraspecific variation in the isotopic niche of <em>D. mawii</em> among different age and sex categories, its interspecific relationships with dominant fish species, and the relative contribution of basal resources to selected aquatic consumers in an oxbow lake in southern Mexico. The community-wide metrics suggested that <em>D. mawii</em> juveniles consumed a greater variety of food resources and/or had access to a wider variety of habitats than adults, regardless of sex. Through the mixing models we detected that the aquatic plant <em>Pistia stratiotes</em> was the main dietary source for adult females, while riparian plants were more important for juveniles and adult males, suggesting intraspecific niche partitioning. We also identified distinct energy pathways for <em>D. mawii</em> and fish, with turtles relying on vascular plants (both riparian and aquatic) while fish primarily depended on seston. Our findings suggest that <em>D. mawii</em> may play an important role in nutrient cycling and potentially regulate the presence of the free-floating macrophyte <em>P. stratiotes</em> at the study site.</div></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"112 ","pages":"Article 126238"},"PeriodicalIF":2.0,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143551493","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}

引用次数: 0

Aquatic macroinvertebrates as indicators of water quality in the wetlands of the Chimborazo Wildlife Reserve – Ecuador

IF 2 4区环境科学与生态学

Limnologica Pub Date : 2025-02-25 DOI: 10.1016/j.limno.2025.126234

Juan Carlos Carrasco-Baquero , Veronica Caballero-Serrano , Daisy Carolina Carrasco-López , Fernando Romero-Cañizares , David Alejandro León-Gualán , Jorge Daniel Córdova-Lliquin , Rufino Vieira-Lanero , Fernando Cobo-Gradín

{"title":"Aquatic macroinvertebrates as indicators of water quality in the wetlands of the Chimborazo Wildlife Reserve – Ecuador","authors":"Juan Carlos Carrasco-Baquero , Veronica Caballero-Serrano , Daisy Carolina Carrasco-López , Fernando Romero-Cañizares , David Alejandro León-Gualán , Jorge Daniel Córdova-Lliquin , Rufino Vieira-Lanero , Fernando Cobo-Gradín","doi":"10.1016/j.limno.2025.126234","DOIUrl":"10.1016/j.limno.2025.126234","url":null,"abstract":"<div><div>The Chimborazo Wildlife Reserve (CR), located in central Ecuador, is home to 16 wetlands distributed in the provinces of Bolivar (7), Tungurahua (4) and Chimborazo (5), with altitudes ranging between 3 825 and 4 240 m above sea level (m.a.s.l.). The objective of the study was to analyse the ecological quality of the reserve's wetlands. Sampling units were established at three points per wetland to measure the physico-chemical variables of the water, which helped to validate the results obtained through macroinvertebrates, since if these organisms determine the ecological state of the wetlands, the physico-chemical analyses determine the reasons for pollution. Two methods were used to collect macroinvertebrates: direct capture and Surber net sampling. Three indices were calculated: Biological Monitoring Working Group for Colombia (BMWP/Col), Ephemeroptera, Plecoptera and Trichoptera (EPT), and Multimetric Index of Ecological Status for High Andean Rivers (IMEERA). A total of 8664 individuals belonging to 7 Classes, 12 Orders and 23 Families were identified, with the Family Hyalellidae being the most abundant. The physico-chemical variables indicated that the wetland water is suitable for agricultural irrigation and livestock use, but definitely not for human consumption. Similarly, the results of the 3 biological indices suggest that the waters should be classified as polluted and that therefore the catchment areas supplied by these ecosystems also constitute polluted aquatic systems. Hence the importance of adopting urgent and decisive measures for the conservation of these ecosystems, which constitute the main source of water supply for the communities that cohabit them.</div></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"112 ","pages":"Article 126234"},"PeriodicalIF":2.0,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143578629","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}

引用次数: 0

Adsorption performance and mechanism of HFO/pumice composites for phosphate in water

IF 2 4区环境科学与生态学

Limnologica Pub Date : 2025-02-21 DOI: 10.1016/j.limno.2025.126237

Jian Huang , Xianjin Qiu , Hua Zhang , Chenxi Zhang , Zhuoyi Lu , Tao Luo , Chunhua He , Jiamei Zhang , Zichen Shuai

{"title":"Adsorption performance and mechanism of HFO/pumice composites for phosphate in water","authors":"Jian Huang , Xianjin Qiu , Hua Zhang , Chenxi Zhang , Zhuoyi Lu , Tao Luo , Chunhua He , Jiamei Zhang , Zichen Shuai","doi":"10.1016/j.limno.2025.126237","DOIUrl":"10.1016/j.limno.2025.126237","url":null,"abstract":"<div><div>Excessive phosphorus is a principal cause of water eutrophication. Adsorption is an effective method for phosphorus removal. Yet there is little research on the adsorption performance and mechanism of phosphorus with HFO (hydrous ferric oxide)/pumice composites. In this study, the HFO/pumice composites were prepared, and the adsorption performance and mechanism of HFO/pumice composites for phosphorus were researched. The results indicated that the phosphorus adsorption performance reached a maximum value of 5.69 mg·g<sup>−1</sup> when the pH was 7. The adsorption performance increased with temperature. Moreover, when Cl<sup>-</sup>, SO<sub>4</sub><sup>2-</sup> and HCO<sub>3</sub><sup>-</sup> coexisted, HCO<sub>3</sub><sup>-</sup> had a greater effect on the adsorption performance of the HFO/pumice composites for phosphorus, and the adsorption performance decreased gradually with the increase of HCO<sub>3</sub><sup>-</sup> concentration. The adsorption isotherms indicated that the Langmuir isotherm model was more suitable to describe the adsorption behavior of the HFO/pumice composites for phosphorus, and the correlation coefficient was 0.9785. In addition, the pseudo-second-order kinetic was more consistent with the adsorption mechanism of HFO/pumice composites for phosphorus. The internal diffusion model showed that the combination of external mass transfer and internal diffusion controlled the adsorption rate of the HFO/pumice composites for phosphorus. The experimental results showed that the adsorption mechanisms of HFO/pumice composites for phosphorus mainly involved pore filling, electrostatic interaction, and surface complexation.</div></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"111 ","pages":"Article 126237"},"PeriodicalIF":2.0,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143471190","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}

引用次数: 0

Adaptation of the biotic index for macroinvertebrates in tributaries of the Itacaiúnas River

IF 2 4区环境科学与生态学

Limnologica Pub Date : 2025-02-21 DOI: 10.1016/j.limno.2025.126239

J.S. Oliveira , M.E.C. Liberal , C.P. Leão , M. Cruz , J. Martins , R.M. Siqueira , B.S. Godoy

{"title":"Adaptation of the biotic index for macroinvertebrates in tributaries of the Itacaiúnas River","authors":"J.S. Oliveira , M.E.C. Liberal , C.P. Leão , M. Cruz , J. Martins , R.M. Siqueira , B.S. Godoy","doi":"10.1016/j.limno.2025.126239","DOIUrl":"10.1016/j.limno.2025.126239","url":null,"abstract":"<div><div>The streams in the Amazon region play a pivotal role in maintaining biodiversity and providing ecosystem services, but they are vulnerable to a range of anthropogenic impacts. The objective of this study is to develop a biotic index based on macroinvertebrate communities for the purpose of assessing the ecological integrity of streams in the Tapirapé-Aquiri National Forest, an area that is threatened by mining and livestock activities. Sampling was conducted in 16 streams with varying degrees of impact over the course of two dry seasons in years of 2022 and 2023. Macroinvertebrates were collected from leaf litter habitats using a kick-net collector. Environmental conditions were evaluated through the adapted habitat integrity protocol and the calculation of integrated disturbance indices. The final index was composed of: genus richness, percentage of predators, and percentage of scrapers. No stream was classified as \"preserved\", with seven streams rated as \"acceptable\", eight as \"impacted\", and one as \"severely impacted\". The analysis indicated that activities such as mining and livestock farming are strongly associated with environmental degradation of high-altitude streams in the Amazon. Although the index showed moderate accuracy in cross-validation, it proved to be a promising tool for monitoring environmental quality in tropical regions. Future studies should consider integrating additional factors, such as habitat connectivity and hydrological dynamics, to enhance the index's sensitivity and support conservation policies.</div></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"111 ","pages":"Article 126239"},"PeriodicalIF":2.0,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143473933","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}

引用次数: 0

An approach towards the quantification of the dynamics of a lacustrine bay based on blue economy investments

IF 2 4区环境科学与生态学

Limnologica Pub Date : 2025-02-21 DOI: 10.1016/j.limno.2025.126235

Christopher Mulanda Aura , Collins Onyango Ongore , Safina Musa , Francis Kimani Njonge , Micheni Japhet Ntiba

{"title":"An approach towards the quantification of the dynamics of a lacustrine bay based on blue economy investments","authors":"Christopher Mulanda Aura , Collins Onyango Ongore , Safina Musa , Francis Kimani Njonge , Micheni Japhet Ntiba","doi":"10.1016/j.limno.2025.126235","DOIUrl":"10.1016/j.limno.2025.126235","url":null,"abstract":"<div><div>The article presents a possible translational approach for the quantification of the changes that may occur in a lakescape following increased blue economy investments. The methodology used available literature, data and information from blue economy strategies implemented in a very active shoreline and rapidly growing Kisumu Bay of Lake Victoria, Kenya, as well as other publicly available online information. The study aimed to investigate the possible dynamics that may have socio-ecological effects on the environment. Six in-situ data collection locations were chosen based on the monthly sampling which occurred between 2018 and 2023. All parameters and investigation sites demonstrated stochastic temporal and geographical shifts. However, using this novel conceptual framework, the data revealed a mixed picture of the effects of blue economy investments on lacustrine health following the revamping of most shoreline activities. Based on nutrient and light transparency data, the lake water was found to be eutrophic to hypereutrophic, which was exacerbated by the start of these initiatives. The socio-ecological assessment showed that the bay had experienced continued variety of blue economy investments ranging in size and proximity to the lake. The parameters used showed varied patterns based on the proposed geographical scaling paradigm. Most of the identified blue economy investments had large variations in magnitude and their closeness to lacustrine ecosystems. This study provides a more practical, focused and localised technique of analysing the socio-ecological and limnological status of a potential hot spot for blue economy investment that is applicable to other lacustrine environments.</div></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"111 ","pages":"Article 126235"},"PeriodicalIF":2.0,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143473932","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}

引用次数: 0

Environmental preservation leads to greater beta diversity of periphytic algae in Amazonian streams

IF 2 4区环境科学与生态学

Limnologica Pub Date : 2025-01-01 DOI: 10.1016/j.limno.2024.126221

Ellen Guimarães Amaral Trindade , Bárbara Dunck

{"title":"Environmental preservation leads to greater beta diversity of periphytic algae in Amazonian streams","authors":"Ellen Guimarães Amaral Trindade , Bárbara Dunck","doi":"10.1016/j.limno.2024.126221","DOIUrl":"10.1016/j.limno.2024.126221","url":null,"abstract":"<div><div>Changes in land use modify the structure of forests and the dynamics of streams. They cause changes in the chemical and physical environments, directly affecting the composition of the local aquatic biota. Our research sought to answer whether species composition is different between streams with different land uses; whether density is higher in locations with lower environmental integrity values; whether the richness and diversity of periphytic species are related to higher values of environmental integrity indices; and whether beta diversity is greater in streams in preserved areas. 18 streams were sampled in the Tapajós River basin, in a range of at least 100 km in the stretch that comprises the banks of the Amazon National Park and its surroundings, located in the southwest region of the State of Pará. Samples of periphytic algae were obtained from the <em>Nymphaea amazonum</em> Mart. & Zucc macrophyte. Our study demonstrated that streams located in preserved areas (national forest) differed environmentally from streams with agricultural land use and presented higher environmental integrity values. Species composition differed between different land uses. Environmental integrity had no effect on species diversity, richness and density. Beta diversity responded to different land uses, and the highest values were observed in streams from more intact environments. Our results showed that environmental variables had a greater influence on the structuring of the periphytic community than landscape variables. Preserved areas were important in environmental heterogeneity and in the formation of the structure of periphytic communities. Our study demonstrated that streams located in preserved areas differ from surrounding streams with different land uses, mainly because they present greater environmental integrity and greater variation in the beta diversity of periphytic algae.</div></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"110 ","pages":"Article 126221"},"PeriodicalIF":2.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143129956","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}

引用次数: 0