Limnologica最新文献

{"title":"Chironomid larvae bioturbation accelerates sediment carbon release and greenhouse gas emissions in macrophyte-dominated and algae-dominated shallow lakes","authors":"Mengyu Sun ,&nbsp;Mingjie Li ,&nbsp;Ying Zhang ,&nbsp;Yaling Su ,&nbsp;Wenming Yan ,&nbsp;Di Xu ,&nbsp;Chengpeng Lu ,&nbsp;Kuanyi Li ,&nbsp;You Zhang","doi":"10.1016/j.limno.2026.126320","DOIUrl":"10.1016/j.limno.2026.126320","url":null,"abstract":"<div><div>Aquatic eutrophication induces lake regime shifts, shifting sediment organic matter sources from macrophytes to algae, altering sediment-water interface (SWI) physicochemical properties and driving benthic macroinvertebrate communities toward pollution-tolerant taxa. Chironomid larvae, as a widespread pollution-tolerant benthic taxon, can influence sediment carbon mineralization and greenhouse gas (GHG) emission through bioturbation at the SWI. However, how different lake systems respond to benthic bioturbation remains unclear. This study, based on a 21-day microcosm experiment, investigated the impact of <em>Propsilocerus akamusi</em> bioturbation on SWI characteristics and GHG emissions in algae-dominated (ADS) and macrophyte-dominated (MDS) systems. ADS sediments exhibited lower organic matter and moisture content than MDS. Chironomid bioturbation enhanced sediment carbon mobilization and transformation, reduced SWI dissolved oxygen, and redistributed C, N, and P. The CO₂ fluxes in bioturbated MDS increased 1.25 × compared to untreated MDS controls and 1.12 × compared to bioturbated ADS. For CH₄ fluxes, in bioturbated ADS were 2.64 × higher than ADS controls, but 0.65 × lower than bioturbated MDS. Interactions between the macrophyte-to-algae trophic regime shift and chironomid bioturbation accelerated organic matter mineralization, likely diminishing carbon sequestration potential and amplifying carbon efflux in shallow lakes.</div></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"117 ","pages":"Article 126320"},"PeriodicalIF":2.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146190343","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":"Consumption of suspended microflora by rotifers and tardigrades in glacier cryoconite holes.","authors":"Miloslav Devetter ,&nbsp;Magdalena Střítecká ,&nbsp;Ludmila H. Houfková ,&nbsp;Michala Tůmová","doi":"10.1016/j.limno.2026.126312","DOIUrl":"10.1016/j.limno.2026.126312","url":null,"abstract":"<div><div>The glacial cryoconite holes are a unique environment inhabited by a community of metazoans, mainly rotifers and tardigrades. They are metazoan consumers of microflora that live at temperatures never exceeding 0–1°C. Using fluorescently labeled, polystyrene beads of bacterial size (0.5 µm diameter) and epifluorescence microscopy, we estimated the filtration activity and clearance rate of glacier populations of rotifers and tardigrades and compared their relative effect on suspended food in cryoconite holes on two glaciers with different load of nutrients. The uptake of particles by both metazoan groups was important. The mean clearance rate calculated for feeding rotifers was similar at the two glaciers, 0.33 and 0.36 µl ind⁻¹ h⁻¹ for the glacier with lower and higher load of nutrients, respectively. The clearance rate of feeding tardigrades on the glacier with lower load of nutrients was 0.69 µl ind⁻¹ h⁻¹ and significantly differ from the glacier with higher load of nutrients,0.15 µl ind⁻¹ h⁻¹. The community of both groups cleared less than 1 % of the cryoconite hole volume per day, resulting in a minor impact. This is the first study to quantitatively estimate the feeding rate in tardigrades.</div></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"117 ","pages":"Article 126312"},"PeriodicalIF":2.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146043329","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":"Development of benthic macroinvertebrates-based multimetric index for assessing the ecological health of Ethiopian Highland streams","authors":"Yared Worku ,&nbsp;Mengistu Asmamaw ,&nbsp;Argaw Ambelu","doi":"10.1016/j.limno.2026.126321","DOIUrl":"10.1016/j.limno.2026.126321","url":null,"abstract":"<div><div>Headwater streams in Ethiopia’s highlands are essential but increasingly threatened by human activities and environmental pressures. Effective conservation requires robust indices to assess ecological health. This study developed a macroinvertebrate-based multimetric index (MMI) for streams in the Dinki watershed, central Ethiopia. From 37 potential metrics, five core metrics were selected: percentage of Ephemeroptera-Odonata-Trichoptera (%EOT), percentage of Trichoptera (%Trico), Hemiptera abundance, Family Biotic Index (FBI), and Average Score Per Taxon (ASPT), based on their response to disturbances, Mann-Whitney U test, Spearman correlation, and boxplots. The MMI was calculated using the minimum and maximum sum scores of core metrics across impacted and reference sites. The lowest score (10.22), indicating poor health, occurred at most Dinki, Zego, and Dense sites, while the highest (22.43), indicating very good health, occurred at Gedamoch and selected Zego and Dense sites. Based on a potential range of 5–25, sites were classified into five ecological health categories. Validation using Spearman’s rs, RDA, boxplots, and Mann-Whitney U tests confirmed that both the core metrics and MMI effectively distinguish impacted from reference sites, highlighting its value as a practical tool for rapid ecological assessment of Ethiopian highland streams.</div></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"117 ","pages":"Article 126321"},"PeriodicalIF":2.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147399665","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 redox discontinuity layer depth drives macroinvertebrate community structure and functional diversity in Tabasco wetlands","authors":"Juan Carlos Rubio-Polania ,&nbsp;Cinthia Trinidad-Ocaña ,&nbsp;Juan Juarez Flores ,&nbsp;Everardo Barba-Macías","doi":"10.1016/j.limno.2026.126309","DOIUrl":"10.1016/j.limno.2026.126309","url":null,"abstract":"<div><div>Wetlands are critically threatened ecosystems whose conservation requires understanding multi-faceted community assembly rules. This study presents a comprehensive assessment of macroinvertebrate communities across 16 wetlands in Tabasco, Mexico, integrating taxonomic, functional, and biomass-based perspectives. We reveal a fundamental decoupling between numerical abundance and biomass in units of ash-free dry weight (AFDW), with each metric responding to distinct environmental drivers. While abundance was shaped by local temperature and productivity gradients, biomass distribution was structured by broad-scale spatial patterns. This decoupling extended to functional organization, where abundance-based trait space was unidimensional, but biomass-based space was multidimensional, indicating multiple strategies for energy accumulation. We found exceptionally high beta diversity (&gt;0.91) dominated by species turnover, confirming these wetlands as a mosaic of unique habitats. Local Contribution to Beta Diversity (LCBD) analysis identified sites of high conservation value (e.g., CEN.S8) and others indicating potential degradation. Functionally, low diversity at sites dominated by pollution-tolerant species suggested anthropogenic stress, though weak links between functional indices and measured variables pointed to unquantified chemical filters. A key finding was the redox discontinuity layer (RDL) depth as a primary environmental driver, structuring communities across all metrics and highlighting sediment biogeochemistry as a master variable. Vegetation productivity (EVI) emerged as the main driver of compositional uniqueness. Our integrated approach demonstrates that effective conservation of these threatened ecosystems requires monitoring that combines abundance and biomass metrics, incorporates sediment redox conditions and vegetation structure, and advances toward direct quantification of industrial contaminants to diagnose true ecosystem health.</div></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"116 ","pages":"Article 126309"},"PeriodicalIF":2.0,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146022710","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":"Nematode assemblages associated to littoral submerged aquatic vegetation at the Bacalar Lake, Quintana Roo, Mexico","authors":"Alberto de Jesús-Navarrete ,&nbsp;Abel Abraham Vargas-Espósitos","doi":"10.1016/j.limno.2026.126310","DOIUrl":"10.1016/j.limno.2026.126310","url":null,"abstract":"<div><div>We investigated composition, distribution, diversity, and functional traits associated with submerged vegetation of nematode assemblages at Bacalar Lake, southeastern Mexico. Six different submerged vegetation species were found at eight sample sites of the Bacalar Lake. The nematode community was composed of 25 families and 46 genera. Dorylaimidae was the most diverse in genera with <em>Ischiodorylaimus</em> as the most abundant. <em>Eleocharis cellulosa</em> showed the highest genus richness in November (27 genera). <em>Chara</em> sp. showed the highest Shannon-Wiener diversity values in March (3.97). The highest Pielou's evenness index values were found for <em>Vallisneria</em> sp. (0.88) in March. There was a dominance of suction feeders in most types of vegetation (46.4 %) and nematodes c-p4 (50.79 %). Some genera were shown to be affected by environmental variables, such as <em>Ischiodorylaimus</em> by water temperature. The diversity and composition did not show significant differences between vegetation types, only between sampling events, while trophic groups and strategy life only between sites. There were more nematode genera at vegetation species (46) than reported in sediments (29). Hence, we conclude that the aquatic macrophytes in Bacalar Lake harbour a distinct nematode community with specific adaptations.</div></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"116 ","pages":"Article 126310"},"PeriodicalIF":2.0,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146022711","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":"Digestive tract morphology, feeding habits, and diet composition of Hyporhamphus limbatus from Southwest Vietnam","authors":"Vinh Quoc Nguyen,&nbsp;Vuong Van Ly,&nbsp;Phuc Le Hoang Nguyen,&nbsp;Lam Thi Thao Vo,&nbsp;Anh Ngoc Tran,&nbsp;Ton Huu Duc Nguyen,&nbsp;Quang Minh Dinh","doi":"10.1016/j.limno.2025.126308","DOIUrl":"10.1016/j.limno.2025.126308","url":null,"abstract":"<div><div>This study investigated the trophic morphology, feeding habits, and natural diet of <em>Hyporhamphus limbatus</em> in Bac Lieu and Ca Mau province, Southwest Vietnam. A total of 960 individuals were sampled monthly from August 2023 to July 2024 at two sites, Vinh Phuoc, Bac Lieu and Dam Doi, Ca Mau (∼40 fish per site per month). Morphological assessments included mouth orientation, dentition, tongue structure, gill arch anatomy, and intestinal configuration. The mean relative gut length (RGL) was 0.34, consistent with carnivory. Gut content analyses were performed on the subset of fish with non-empty guts (n = 703). Small fishes dominated the diet (58.65 %), followed by ants (13.64 %) and shrimp (12.46 %); other items each contributed &lt; 10 %. PERMANOVA indicated a significant seasonal effect on diet composition (df = 1, F = 11.24, p &lt; 0.001), with fish biomass in guts higher during the wet season, whereas ants increased markedly during rainfall events. No significant dietary differences were detected between sexes or sampling sites. The morphology and diet demonstrate a specialized, primarily piscivorous strategy, which has implications for fisheries resource management and the potential development of aquaculture in Southwest Vietnam.</div></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"116 ","pages":"Article 126308"},"PeriodicalIF":2.0,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145840885","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":"Seasonal river connections modulate community structure in (sub) tropical temporary pools","authors":"Grite Nelson Mwaijengo ,&nbsp;Bram Vanschoenwinkel ,&nbsp;Luc Brendonck","doi":"10.1016/j.limno.2025.126298","DOIUrl":"10.1016/j.limno.2025.126298","url":null,"abstract":"<div><div>In natural river systems in arid and semi-arid lands, surrounding floodplains may contain temporary pools. Some of these may be mainly rain-filled (endorheic systems) while others may be partly rain-fed but connect to the flooding river during a good rainy season (river-connected pools). However, how seasonal river flooding affects the community structure in temporary floodplain pools is not well understood, particularly in the Afro-tropical region. Here, we studied the role of seasonal river connections in modulating water quality and benthic macroinvertebrate community structure and functional feeding groups in a set of endorheic versus river-connected temporary pools in a river-floodplain ecosystem in northeastern Tanzania. Benthic macroinvertebrate communities from the two habitats were significantly differentiated. Spatial species turnover (β-diversity) was higher in river-connected pools, but endorheic ones supported a higher taxon richness (alpha diversity). Benthic macroinvertebrate community dissimilarity between pools was largely determined by turnover rather than by nestedness. Hydrological connectivity was positively associated with electric conductivity and negatively associated with nutrient concentrations in the river-connected pools. In addition, the river facilitated fish dispersal, which likely excluded predation sensitive taxa such as the large branchiopod crustaceans <em>Streptocephalus bourquinii</em> and <em>Streptocephalus wirminghausi</em>. Taxon richness of collector-gatherers and scrapers was significantly different between pool types. Indicator species analysis revealed no specific fauna unique to river-connected pools. This study illustrates that land management schemes that aim to preserve temporary-pool biodiversity should strive to include both endorheic and river-connected pools to support high regional biodiversity, potentially with a priority for the more diverse endorheic systems.</div></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"116 ","pages":"Article 126298"},"PeriodicalIF":2.0,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145665410","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":"Food web modeling and network analysis unravel contrasting ecosystem functions in Ethiopian Rift Valley lakes","authors":"Mathewos Hailu ,&nbsp;Seyoum Mengistou ,&nbsp;Tadesse Fetahi","doi":"10.1016/j.limno.2025.126297","DOIUrl":"10.1016/j.limno.2025.126297","url":null,"abstract":"<div><div>Ecosystem-based management is an integrated approach that recognizes biodiversity, the complexity of social ecological systems, and the importance of ecosystem connections. To support this approach, we compared the food web structure and function of three Ethiopian Rift Valley lakes, Lake Ziway, Hawassa, and Chamo, using Ecopath with Ecosim models. A linear inverse modeling approach was employed to estimate unmeasured flows and quantify model uncertainty. The total system throughput was lowest in Lake Ziway (13.9 kt/km²/yr) compared with Lake Chamo (28.8 kt/km²/yr) and Lake Hawassa (36.8 kt/km²/yr), likely reflecting impacts of high turbidity on primary production. Network analysis suggests Lake Chamo has a more mature and organized structure, whereas Lakes Hawassa and Ziway appear more constrained by fisheries exploitation, with Lake Ziway also impacted by high sediment loads. While Lake Chamo showed greater stability, Lake Ziway exhibited the highest nutrient recycling (Finn’s Cycling Index), a potential indicator of system stress. Simulation scenarios exploring perturbations revealed that decreased primary production could increase overall food web efficiency, while recovery of fish biomass may enhance system resilience. This study highlights the value of a holistic, modeling approach in developing tailored, ecosystem-based management strategies for lake ecosystems facing distinct anthropogenic pressures.</div></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"116 ","pages":"Article 126297"},"PeriodicalIF":2.0,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145685687","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":"Climate change increases functional richness and shifts trait composition of benthic macroinvertebrate assemblages along the river continuum","authors":"Marie Zhai,&nbsp;Michal Janáč,&nbsp;Michal Horsák,&nbsp;Jindřiška Bojková","doi":"10.1016/j.limno.2025.126307","DOIUrl":"10.1016/j.limno.2025.126307","url":null,"abstract":"<div><div>The recently observed massive reorganisations of macroinvertebrate assemblages in streams are usually attributed to the combined effects of changes in water quality and climate. The consequences of the associated functional changes for ecosystem services and future development are still unknown. In this study, we try to disentangle the effects of climate change on the functional structure from other anthropogenic effects. To do so, we examine functional richness and composition of biological traits in macroinvertebrate assemblages, coming from 65 near-natural streams in the Czech Republic, where anthropogenic stressors apart from those due to climate change were minimal. We sampled the macroinvertebrates using a standardized biomonitoring sampling protocol during three periods from 1997 to 2015. To understand the patterns along the river continuum, we covered a substantial gradient of source distance (3–260 km). The assemblages previously showed a high increase in total species richness and abundances of many native species. As functional richness directly depends on species richness by virtue of probability, we introduced a novel concept of rarefied functional richness, where assemblages of the species richer period were rarefied to equal the number of species in the less species rich period at each site. We found a significant functional enrichment, predominantly independent of the higher number of species and tending towards a unimodal pattern along the source distance. The functional composition overall shifted to that of downstream sections in all source distance intervals, based mainly on life cycle, body size, locomotion, representation of several feeding groups, and dispersal abilities. The shift was mostly indicative of the substantial effects of lower flow conditions associated with fine sediment deposition, increased temperature and an increase in resources, mainly for collectors/gatherers and predators.</div></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"116 ","pages":"Article 126307"},"PeriodicalIF":2.0,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145840884","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":"A technique to monitor growth and spread of early-stage variable-leaf watermilfoil in a shallow impoundment","authors":"Noah Bohl ,&nbsp;Michael R. Twiss ,&nbsp;Diana T. White","doi":"10.1016/j.limno.2025.126291","DOIUrl":"10.1016/j.limno.2025.126291","url":null,"abstract":"<div><div>We describe an approach to measure the invasiveness of <em>Myriophyllum heterophyllum</em> (variable leaf watermilfoil) in a shallow dystrophic impoundment at the early stages of an invasion. Over an eight-week observation period, dry weight measurements show a biomass specific rate growth rate of 0.0048·day⁻¹, consistent with other studies of invasive watermilfoil growth, and a diffusion rate (biomass spread) of D = 9.2 cm²·d⁻¹, which describes the horizontal encroachment into plant-free sediment.</div></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"115 ","pages":"Article 126291"},"PeriodicalIF":2.0,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145097893","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}