International Review of Hydrobiology最新文献

{"title":"Spatial and Temporal Patterns of Gammarus sp. in Lowland Streams Analyzed Through Amino Acid Isotope Analysis","authors":"Shaista Khaliq,&nbsp;Alexandra Schlenker,&nbsp;Steffen Kümmel,&nbsp;Daniel Höhn,&nbsp;Maik A. Jochmann,&nbsp;Klaus Kerpen,&nbsp;Patrick Fink,&nbsp;Markus Weitere,&nbsp;Torsten C. Schmidt","doi":"10.1002/iroh.70024","DOIUrl":"https://doi.org/10.1002/iroh.70024","url":null,"abstract":"<p>Understanding the trophic ecology and nutrient dynamics of freshwater invertebrates is crucial for evaluating the function and resilience of ecosystems. Although bulk stable isotope analysis is widely used to investigate food web structures, it lacks the resolution required to differentiate between carbon and nitrogen sources at a molecular level. Compound-specific isotope analysis (CSIA) of amino acids (AAs) offers a more detailed approach; however, its application in freshwater ecosystems, particularly across spatial and temporal gradients, remains limited. This study addresses this issue by applying AA-specific δ¹⁵N and δ¹³C analysis to the key detritivore Gammarus spp. across the North Rhine-Westphalia catchment in Germany over 4 years (2016, 2018, 2020, and 2022). Significant spatial variation in δ¹³C values was observed, while temporal trends were less pronounced. Nonessential AAs exhibited higher δ¹³C values than essential AAs, with glycine being the most enriched in ¹³C and lysine and phenylalanine the most depleted. Principal component analysis (PCA) of δ¹³C values revealed variability in carbon sourcing, reflecting shifts between primary producers, microbial inputs, and detrital material. Regarding δ¹⁵N, trophic AAs such as leucine and glutamic acid were enriched, whereas source AAs such as phenylalanine were depleted, confirming their roles in nitrogen metabolism. PCA of δ¹⁵N values revealed that some sites maintained stable nitrogen inputs from autotrophic sources, while others showed increasing contributions from microbial or detrital nitrogen over time. Trophic position (TP) estimates for Gammarus spp. were consistent across sites and years, ranging from 1.1 to 1.5 using the TP_Glu-Phe method and from 1.4 to 1.8 using the TP_5AA method. This confirms their role as primary consumers. These findings emphasize the ecological importance of Gammarus spp. in nutrient cycling and demonstrate the effectiveness of CSIA-AA in unraveling complex trophic interactions and food web dynamics.</p>","PeriodicalId":54928,"journal":{"name":"International Review of Hydrobiology","volume":"110 2","pages":"151-165"},"PeriodicalIF":2.3,"publicationDate":"2025-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/iroh.70024","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145761302","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Lake–Groundwater Biogeochemical Interactions in a River-Delimited System: The Groundwater and Lakes Urban Observatory (GLUO)","authors":"Marlene Dordoni,&nbsp;Andreas Musolff,&nbsp;Kay Knöller,&nbsp;Luisa Coder,&nbsp;Martin Krauss,&nbsp;Yvonne Rosenlöcher,&nbsp;Olaf Büttner,&nbsp;Jörg Tittel","doi":"10.1002/iroh.70025","DOIUrl":"https://doi.org/10.1002/iroh.70025","url":null,"abstract":"<p>Preservation of urban aquatic ecosystems is of primary importance for human well-being, biodiversity protection and the future of society. Lake–groundwater–river interactions within urban floodplains harbour intrinsic fragility, yet remain largely understudied. Appropriate environmental management can help assure the conservation of these sites through strategies that are based on physical, chemical and isotope constraints. Here we present the example of the Groundwater and Lakes Urban Observatory (GLUO) in Magdeburg, Germany, where monitoring has been carried out since 2022. Our database for the year 2023 includes data from the Elbe River, two lakes named Lake Salbker South and Lake Salbker North, and two groundwater wells. Major ion patterns point to the Elbe River and Lake Salbker South as the end-members for water compositions within the system, although contributions from the former appear less significant. Stiff plots suggest the existence of a more saline end-member that may receive inputs from the Zechstein Formation and drives the geochemistry of Lake Salbker South. Dissolved oxygen (DO) concentrations in Lake Salbker South during stratification show a marked depletion in the hypolimnion with values down to 1.8 mg L⁻¹ that we attribute to mineralization of organic matter as well as oxidation of sulphur compounds. This feature acknowledges Lake Salbker South as a natural hydrogen sulphide (H₂S) reactor. Water stable isotope compositions (δ²H_H2O and δ¹⁸O_H2O) of the water bodies within the GLUO outline a trend that is compatible with moderate evaporation. We discuss that dissolution of saline deposits may also play a role. These findings emphasize the need to implement the study of lake–groundwater–river interactions within floodplains, especially when hypertrophic or sulphur-rich water bodies are involved. Due to the inherent vulnerability and potential hazards associated to these environments, we stress the importance of establishing a multidisciplinary monitoring framework to evaluate their geochemical fluxes and ecological integrity.</p>","PeriodicalId":54928,"journal":{"name":"International Review of Hydrobiology","volume":"110 2","pages":"135-150"},"PeriodicalIF":2.3,"publicationDate":"2025-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/iroh.70025","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145754558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of Nile Tilapia Fish Cage Farming on Macroinvertebrate Communities in Lake Kivu, Democratic Republic of the Congo","authors":"Sharon Indasi Lubembe,&nbsp;Jacques R. Walumona,&nbsp;Beni Lwikitcha Hyangya,&nbsp;Jean-Diste M. Kulimushi,&nbsp;Giséle A. Shamamba,&nbsp;Belinda H. R. Hounsounou,&nbsp;Isidore Maluzi,&nbsp;Sophie Ngayirwa,&nbsp;Mulongaibalu Mbalassa,&nbsp;Frank O. Masese,&nbsp;Mulungula Pascal Masilya","doi":"10.1002/iroh.70023","DOIUrl":"https://doi.org/10.1002/iroh.70023","url":null,"abstract":"<div>\u0000 \u0000 <p>This study analysed how macroinvertebrate communities in Lake Kivu responded to Nile tilapia cage farming. Macroinvertebrates were collected at two sampling stations impacted by fish farms and a control station without fish farming, and physicochemical variables were measured in situ. Water samples were analysed in the laboratory for nutrients and chlorophyll-a. Only turbidity, water transparency, dissolved oxygen, and phosphate significantly differed between the three stations. Three macroinvertebrate phyla (Arthropoda, Mollusca, and Annelida), nine orders (Gastropoda, Diptera, Decapoda, Annelida, Odonata, Ephemeroptera, Coleoptera, Heteroptera, and Hemiptera), and 37 families were identified. Three groups, Diptera, Gastropoda, and Odonata, were abundant and dominated both cage and control stations. Predators, collector-gatherers, and scavengers were more dominant than scrapers and shredders. The composition of macroinvertebrate communities significantly differed between the three stations, but not between the fish cage and control stations. Moreover, there were no significant seasonal differences in community composition. Accordingly, cage farming does not yet seem to pose a threat to Lake Kivu's ecological condition. Nonetheless, we recommend frequent monitoring of water and sediment quality to detect early signals and avoid fish farms impacting the ecosystem health of the lake.</p>\u0000 </div>","PeriodicalId":54928,"journal":{"name":"International Review of Hydrobiology","volume":"110 2","pages":"117-134"},"PeriodicalIF":2.3,"publicationDate":"2025-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145754611","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Coexistence and Fouling of Asian Clam Corbicula fluminea by Dreissenid Mussels at Two Transects in Upper Lake Constance","authors":"Sophia Trumpfheller,&nbsp;Kirstin Zang,&nbsp;Petra Teiber-Sießegger,&nbsp;Gerhard Maier","doi":"10.1002/iroh.70022","DOIUrl":"https://doi.org/10.1002/iroh.70022","url":null,"abstract":"<div>\u0000 \u0000 <p>The abundance and vertical distribution of <i>Dreissena polymorpha</i> (zebra mussel), <i>Dreissena rostriformis bugensis</i> (quagga mussel), and <i>Corbicula fluminea</i> (Asian clam) at two sites characterized by different dominant sediment types, and the fouling rate of <i>Corbicula</i> by dreissenids were studied. Sediment samples were taken, using a sediment grab (base area 22 × 25 cm = 550 cm²), at depths of 3, 6, 10, 15, 20, 50, and 100 m. The abundance of <i>Corbicula</i> was significantly higher at the sandy substrate site (Schussen Estuary) than at the site where coarse, gravelly substrate predominated (Nonnenhorn), whereas no difference in the abundance of quagga mussels was observed between the two sites. No living zebra mussels were found at either station. However, the quantification of dead zebra mussel, that is, their shells, revealed a much higher former abundance at Nonnenhorn than at the Schussen Estuary. Depth distribution revealed that <i>Corbicula</i> and quagga vertical distributions overlapped at the Schussen Estuary. Fouling rates on <i>Corbicula</i> were low when all individuals were considered: only 44 (5%) of the overall 871 living <i>Corbicula</i> individuals examined were fouled by quagga mussels. However, <i>Corbicula</i> larger than 1 cm showed a considerably higher fouling rate of 31%. Comparison of <i>Corbicula</i> abundances in the years 2016, 2021, and 2023 indicated that no overall decrease in abundance had occurred but a decrease of the proportion of large individuals relative to small ones had. Consequently, we recommend further investigations on the topic of <i>Corbicula</i> fouling by quagga mussels.</p>\u0000 </div>","PeriodicalId":54928,"journal":{"name":"International Review of Hydrobiology","volume":"110 2","pages":"109-116"},"PeriodicalIF":2.3,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145754572","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Trophic Status and Ecosystem Functioning of Tropical Lake Tinshu Abaya, Ethiopia: A Mass-Balance Modeling Approach","authors":"Yordanos Getachew,&nbsp;Million Tesfaye,&nbsp;Demeke Kifle,&nbsp;Mathewos Hailu,&nbsp;Tadesse Fetahi","doi":"10.1002/iroh.70018","DOIUrl":"https://doi.org/10.1002/iroh.70018","url":null,"abstract":"<div>\u0000 \u0000 <p>Freshwater ecosystems are highly susceptible to degradation, underscoring the importance of assessing their health using ecological indicators. In this study, we developed an Ecopath mass-balance model for Lake Tinshu Abaya, Ethiopia, and analyzed its trophic structure and energy flows. The model integrated seven functional groups using data on fish catch, diet composition, and plankton biomass collected from March to August 2022. The seven functional groups were detritus, phytoplankton, herbivorous zooplankton, carnivorous zooplankton, zoobenthos, Nile Tilapia (<i>Oreochromis niloticus</i>), and birds. Four trophic levels were determined, ranging from 1.00 for primary producers and detritus to 3.56 for birds of prey. The calculated values for the EE of the primary producers (phytoplankton: 0.87; detritus: 0.75) indicated that they were highly exploited compared to the secondary producers, the herbivorous zooplankton (0.40), the carnivorous zooplankton (0.065), and the zoobenthos (0.60). The computed primary production to total respiration (<i>P</i>/<i>R</i>) ratio of 1.19 suggested that the ecosystem is in a developing, net autotrophic state. The ecosystem exhibited a high degree of internal recycling (Finn's Cycling Index = 15.2%), reflecting efficient energy and nutrient utilization. The trophic connectivity index of 0.56 suggested a moderately interconnected food web. Collectively, these metrics indicate that Lake Tinshu Abaya is a developing ecosystem in a transitional stage, not yet having reached full ecological maturity.</p>\u0000 </div>","PeriodicalId":54928,"journal":{"name":"International Review of Hydrobiology","volume":"110 2","pages":"100-108"},"PeriodicalIF":2.3,"publicationDate":"2025-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145761280","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Increase in CH4 Emissions in a Pantanal Wetland Lagoon Due to Extreme Drought and Sediment Exposure","authors":"João Paulo Mariano Godinho,&nbsp;Ricardo Hideo Taniwaki,&nbsp;André Renan Costa-Silva,&nbsp;Célia Regina Montes,&nbsp;Adolpho José Melfi,&nbsp;Janaina Braga do Carmo","doi":"10.1002/iroh.70021","DOIUrl":"https://doi.org/10.1002/iroh.70021","url":null,"abstract":"<p>The Pantanal, one of the largest wetlands on Earth, stores substantial carbon in its diverse ecosystems but faces increasing threats, such as fires, poor soil management, deforestation, and climate change impacts that may elevate CH₄ emissions. Given the importance of this ecosystem, we investigated methane (CH₄) emissions from the limnetic zone and marginal soils in a drying lagoon in the Pantanal during a drought period unprecedented in over 75 years. To this end, CH₄ flux measurements were conducted along a transect with three replicates in each of the evaluated compartments, with four samples collected per day during both a dry-season and a wet-season campaign (2019–2020). The highest emissions occurred during the drying event, primarily in the aquatic compartment (7.43 mg ± 5.51 CH₄ m⁻² day⁻¹, mean ± SD, <i>n</i> = 20), representing a 56-fold increase in CH₄ emissions compared to the wet season, and along the margins (3.43 ± 3.55 mg CH₄ m⁻² day⁻¹, <i>n</i> = 12). This indicates that the lowering of the water column and exposed sediments became a significant source of CH₄ emissions. Our results suggest that these environments can become large CH₄ emitters during drying events. Accordingly, current CH₄ emission models underestimate their contribution due to neglecting sediment exposure effects. With the expected increase in drying events in the Pantanal, CH₄ emissions will likely rise in the coming years, exacerbating global warming and intensifying climate change.</p>","PeriodicalId":54928,"journal":{"name":"International Review of Hydrobiology","volume":"110 2","pages":"90-99"},"PeriodicalIF":2.3,"publicationDate":"2025-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/iroh.70021","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145761265","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Insights Into the Distribution of Two Bloom-Forming Dinoflagellates of Phytosanitary Concern Using Regional and Global Temperature Data","authors":"Rafael L. Macêdo,&nbsp;Odete Rocha,&nbsp;Betina Kozlowsky-Suzuki","doi":"10.1002/iroh.70019","DOIUrl":"https://doi.org/10.1002/iroh.70019","url":null,"abstract":"<p>Large bloom-forming dinoflagellates can alter aquatic biodiversity and impact human use, posing conservation challenges. We used the maximum entropy (MaxEnt) model to predict the potential distribution of two <i>Ceratium</i> congeners, <i>C. hirundinella</i> and <i>C. furcoides</i> and reviewed known temperature tolerances across their introduced ranges in the American continent. MaxEnt models performed well, predicting 59% global environmental suitability for <i>C. furcoides</i> and 19% for <i>C. hirundinella</i>, with a 22% overlap in suitable areas. Reported co-occurrences in the literature occurred within these predicted overlap areas. Model response curves reflected patterns consistent with the observed water temperature distributions, with <i>C. furcoides</i> associated with higher mean temperatures than <i>C. hirundinella</i>. Future research should integrate bloom event records with quantitative measures of cell density and biomass, as the correspondence between high-suitability areas and reported impacts indicates that such data could enhance risk assessments and support more effective mitigation of the ecological impacts caused by the continuing spread of <i>Ceratium</i>.</p>","PeriodicalId":54928,"journal":{"name":"International Review of Hydrobiology","volume":"110 2","pages":"83-89"},"PeriodicalIF":2.3,"publicationDate":"2025-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/iroh.70019","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145754472","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"From Saline to Freshwater: Ecological Shifts, Emerging Fisheries, and Health Risks in Lake Nakuru","authors":"C. S. Nyamweya,&nbsp;C. M. Aura,&nbsp;E. Waithaka,&nbsp;J. M. Njiru,&nbsp;N. K. Momanyi,&nbsp;F. J. Awuor,&nbsp;R. Kundu","doi":"10.1002/iroh.70020","DOIUrl":"https://doi.org/10.1002/iroh.70020","url":null,"abstract":"<div>\u0000 \u0000 <p>Lake Nakuru, historically a hypersaline lake in Kenya's Rift Valley, has undergone a significant ecological transformation due to a sustained saline–freshwater inversion driven by increased rainfall, catchment degradation, and anthropogenic inputs. This study provides a spatially resolved assessment of the lake's current physico-chemical status, biological structure, and socioeconomic dynamics. Results show a dramatic decline in salinity from historical levels of 20–40 to 2.58–2.6 g/kg, weakening the lake's buffering capacity and altering nutrient stoichiometry. Molar TN/TP ratios across all sites were exceptionally low (0.09–0.19), indicating persistent nitrogen limitation and conditions conducive to cyanobacterial dominance. <i>Microcystis</i> comprised 27.58% ± 3.78% of the mean dietary contribution of <i>Oreochromis niloticus</i>, whose proliferation reflects a major shift in the lake's food web. Flamingo populations have declined, likely due to the collapse of their specialized food base. Microbial contamination was highest at river inflow sites. Further, we found elevated concentrations of arsenic and lead in fish tissue, raising critical public health concerns. The emergence of an informal tilapia fishery, driven by ecological changes and declining tourism, has introduced new economic opportunities but also sparked conflict due to its illegality within the protected national park. Vulnerable groups, particularly women, face heightened exposure to both economic instability and health risks. The findings indicate that Lake Nakuru has moved beyond early pollution symptoms into a phase of advanced ecological disruption, underscoring the need for urgent, multisectoral interventions.</p>\u0000 </div>","PeriodicalId":54928,"journal":{"name":"International Review of Hydrobiology","volume":"110 2","pages":"70-82"},"PeriodicalIF":2.3,"publicationDate":"2025-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145761361","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Benthic Diatom Distribution Along a Salinity Gradient in Southeast Caspian Sea Watersheds, Northeast Iran","authors":"Jamileh Panahy Mirzahasanlou,&nbsp;Mojtaba G. Mahmoodlu,&nbsp;Mostafa K. Gharavi,&nbsp;Haniyeh Yusefi,&nbsp;Arsalan Bahalkeh,&nbsp;Mohsen Ghalandar","doi":"10.1002/iroh.70017","DOIUrl":"https://doi.org/10.1002/iroh.70017","url":null,"abstract":"<div>\u0000 \u0000 <p>In coastal areas, salinity is an important variable structuring diatom composition. The Caspian Sea is the world's largest enclosed water body. Variations in benthic diatom composition along salinity gradients were investigated in two important rivers flowing into the southeast Caspian Sea, Gorganroud and Atrak. Epipelic diatom samples were collected from 11 sites from November 2020 to April 2021, along with water samples. One hundred three taxa belonging to 34 genera were identified, of which 47 taxa (≥ 1% relative abundance in ≥ 5 samples were used to model optima and tolerance). The results revealed a shift from freshwater to brackish taxa in dominant and subdominant diatoms with increasing salinity (from 0.02 to 6.64 g.L⁻¹). Taxa such as <i>Amphora inariensis and Cymbella excisa</i> dominated low-salinity sites, while <i>Navicula salinarum, Nitzschia cf. thermaloides</i>, and <i>Haslea spicula</i> increased downstream. Salinity significantly affected the diatom distribution and separated brackish taxa from freshwater ones. However, ammonium and temperature were equally important in Atrak, and phosphate and dissolved oxygen also contributed. However, salinity was not the only factor determining diatom distribution, as nutrients and thermal regime modulated assemblages where salinization was less extreme. Shannon diversity and evenness declined at intermediate salinities (5–7 g.L⁻¹), reflecting Remane's species-poor zone. These findings underscore diatom's value for monitoring salinization and nutrient impacts in Caspian tributaries and support their use in catchment management and long-term ecological assessments.</p>\u0000 </div>","PeriodicalId":54928,"journal":{"name":"International Review of Hydrobiology","volume":"110 2","pages":"57-69"},"PeriodicalIF":2.3,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145761108","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Catchment-Scale Eucalyptus Plantation Effects on Tropical Streams","authors":"Alessandra Peil,&nbsp;Guilherme Sena,&nbsp;Raiane S. Rabelo,&nbsp;Renan de Souza Rezende,&nbsp;Verónica Ferreira,&nbsp;Alan M. Tonin,&nbsp;José Francisco Gonçalves Junior","doi":"10.1002/iroh.70016","DOIUrl":"https://doi.org/10.1002/iroh.70016","url":null,"abstract":"<div>\u0000 \u0000 <p>Forestry plantations occur across the globe, and they are important in many tropical countries for timber supply. Plantations of non-native species, such as those of <i>Eucalyptus</i> species, may greatly affect the functioning of detritus-based ecosystems. However, despite eucalyptus plantations covering about 20 million hectares in tropical and subtropical regions (from a total of about 25 million hectares globally), there is scarce information about their effects on forest stream functioning. Our aim was to assess the effects of catchment-scale eucalyptus plantations (with native riparian buffers) on the functioning of tropical streams in the Cerrado biome. For that, three streams in catchments with eucalyptus plantations (eucalyptus streams) and three streams in catchments with native vegetation (native streams) were compared regarding water characteristics, litter inputs (vertical and lateral), decomposition of leaf litter (from a common native species, an eucalyptus species used in plantations, and a palatable exotic species) and litter-associated aquatic communities. We hypothesized that catchment-scale <i>Eucalyptus</i> plantations negatively affect stream characteristics (reduced water flow, heightened water acidity), litter inputs, aquatic communities, and litter decomposition in streams because dense, even-aged monocultures of eucalyptus trees have higher water consumption rates and produce recalcitrant litter. We also hypothesized that the effects of plantations would be stronger on shredders, as they are directly influenced by changes in litter input compared to other functional feeding groups. Finally, we hypothesized that plantation impacts on leaf litter decomposition would be stronger for palatable leaf litter, where invertebrate shredders play a major role, than for more recalcitrant and less palatable leaf litter. We found lower dissolved oxygen concentrations, lateral litter inputs, and litter decomposition in eucalyptus streams than in native streams. Conversely, fungal biomass on decomposing litter did not differ between eucalyptus streams and native streams. <i>Eucalyptus</i> plantations reduced overall invertebrate densities but did not affect shredder densities. Our study shows that catchment-scale eucalyptus plantations can change water characteristics and litter inputs to streams, thus slowing down litter decomposition in tropical streams, even when a native buffer is present. Increasing the width of the native buffer vegetation may contribute to increasing its protective role.</p>\u0000 </div>","PeriodicalId":54928,"journal":{"name":"International Review of Hydrobiology","volume":"110 2","pages":"42-56"},"PeriodicalIF":2.3,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145754625","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}