Aquatic Ecology最新文献

{"title":"Longitudinal gradients modulate the distribution, composition, and ecological risk of microplastics in a neotropical public water supply reservoir","authors":"Elizangela Alves dos Santos,&nbsp;Felipe Antonio dos Santos,&nbsp;Odete Rocha,&nbsp;João Carlos da Cunha Rangel,&nbsp;Flávio Montenegro de Andrade,&nbsp;Jacqueline Santos Silva-Cavalcanti","doi":"10.1007/s10452-026-10338-7","DOIUrl":"10.1007/s10452-026-10338-7","url":null,"abstract":"<div><p>Microplastics (MPs) contamination was assessed in the water and surface sediment in the upstream, dam, and downstream zones of the Tapacurá Reservoir, a tropical public water supply system in northeastern Brazil, over the course of four sampling campaigns. MPs were detected in all samples, with abundances ranging from 13,880 to 27,780 MPs m⁻³ in the water and 10,940 to 50,760 MPs kg⁻¹ in the sediment. Higher concentrations in the water occurred in the dam area, while accumulation in the sediment was greater downstream, reflecting contrasting transport and deposition dynamics along the longitudinal gradient. The composition of MPs differed significantly between compartments (PERMANOVA, <i>p </i>= 0.001), with fibers predominating in the water (73%) and fragments in the sediment (87%), and particles of 100–500 μm being the most common size class in both. Polypropylene and polyethylene were the dominant polymers, reflecting contributions from urban and agricultural sources in the watershed. Low degradation MPs prevailed in both compartments, while moderately to highly degraded particles were more frequent downstream, indicating progressive weathering throughout the system. Ecological risk indices indicated low to moderate risk in the water, but very high risk in the sediment, especially downstream (PLRI &gt; 2500; Class IV), associated with the accumulation of highly hazardous polymers, with implications for benthic organisms and the food chain. These results demonstrate that tropical reservoirs function simultaneously as conduits and sinks for MPs, reinforcing the need for systematic monitoring in public water supply systems under anthropogenic pressure.</p></div>","PeriodicalId":8262,"journal":{"name":"Aquatic Ecology","volume":"60 3","pages":""},"PeriodicalIF":2.2,"publicationDate":"2026-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10452-026-10338-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148751709","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}

{"title":"An exploratory multi-indicator assessment of freshwater ecosystem health in two South African reservoirs","authors":"Zamantungwa Thobeka Happiness Mnisi,&nbsp;Minah Mmakgonchane Matheta,&nbsp;Collins Nkotoloane Mashilwane,&nbsp;Willem Johannes Smit,&nbsp;Kedibone Masenya,&nbsp;Wilmien Jacoba Luus-Powell","doi":"10.1007/s10452-026-10335-w","DOIUrl":"10.1007/s10452-026-10335-w","url":null,"abstract":"<div><p>This study assessed freshwater ecosystem health by integrating chemical, biological, and microbial indicators. We conducted an exploratory comparison of Loskop Dam and Nwanedi-Luphephe Dam, South Africa, using water quality parameters, fish Health Assessment Index (HAI) scores, parasite assemblages, and 16S rRNA gut microbiota profiling. Sampling occurred between March and May 2025. Selected water parameters were measured <i>in situ,</i> with nutrient and metal analyses conducted from 1 L water samples. Nineteen fish (<i>Oreochromis mossambicus</i>, n = 10; <i>Clarias gariepinus</i>, n = 9) were examined for parasites, and gut microbial communities and the HAI scores calculated. The microbial functional prediction potential was inferred using PICRUSt2. Loskop Dam showed elevated total dissolved solids (272.75 mg/L vs. 40 mg/L), conductivity (41.07 vs. 6.0 mS/m), and pH (7.69 vs. 7.14) values compared with Nwanedi-Luphephe Dam. Fish from Loskop Dam exhibited a higher mean HAI score (45.0 ± 25.50) than Nwanedi-Luphephe Dam (34.4 ± 14.24) and greater endoparasite loads, particularly <i>Contracaecum</i> <i>spp.</i>, whereas fish from Nwanedi-Luphephe Dam harboured more ectoparasitic monogeneans. Gut microbiota was dominated by the phyla Fusobacteriota, Bacillota, Pseudomonadota and Planctomycetota, while classified genera were primarily represented by <i>Cetobacterium, Romboutsia, Clostridium, Bacteroides</i> and <i>Sediminibacterium</i>. In the final multivariable model, fish weight was the only significant predictor of HAI score (p = 0.03), whereas dam and fish species were not significant. PICRUSt2 identified ten metabolic pathways differing between dams, with nine core pathways enriched in Nwanedi-Luphephe Dam; PWY01479, PWY042, PWY-5747, PWY-5856, PWY-5857, PWY-5855, PWY-6708, UBISYN-PWY, and PWY-5920, while the nucleotide salvage pathway (PWY-6609) was enriched in Loskop Dam. Results reveal that Loskop Dam exhibits moderate anthropogenic impact, whereas Nwanedi-Luphephe Dam represents a relatively undisturbed ecosystem. Integrating water chemistry, fish health, parasite assemblages, and gut microbiota may offer a sensitive framework for monitoring freshwater ecosystem integrity and detecting early ecological disturbance.</p></div>","PeriodicalId":8262,"journal":{"name":"Aquatic Ecology","volume":"60 3","pages":""},"PeriodicalIF":2.2,"publicationDate":"2026-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10452-026-10335-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148750980","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}

{"title":"Common and rare stream diatoms respond differently to local, catchment and spatial drivers","authors":"Maria Gabrielle Rodrigues-Maciel,&nbsp;Ana Paula Tavares Costa,&nbsp;Isabela Menezes Pinzón,&nbsp;Claudio Rossano Trindade Trindade,&nbsp;Ricardo Hideo Taniwaki,&nbsp;Fabiana Schneck","doi":"10.1007/s10452-026-10336-9","DOIUrl":"10.1007/s10452-026-10336-9","url":null,"abstract":"<div><p>The relative importance of environmental selection, dispersal, and demographic stochasticity in structuring aquatic communities remains poorly resolved, especially in human-impacted Neotropical regions. Using diatoms, we assessed how local environmental conditions, catchment land use, and spatial factors shape community richness and composition in subtropical streams, and whether responses differ among common, rare, and very rare species. Diatoms were sampled in 50 streams of the Ibicuí river basin (Pampa biome, Brazil). Species were identified and categorized as common, rare, or very rare based on abundance quartiles. We measured local variables, land use, and spatial predictors (PCNM). Richness was modeled by multiple linear regression, while composition was analyzed via pRDA and variation partitioning. Local environmental variables were primary predictors of species richness across all groups, with canopy openness as a key filter. Conversely, community composition showed a strong spatial signature for the total assemblage and common species, where PCNM accounted for most variation; land use effects were minimal. The composition of rare species was explained only by water velocity, while very rare species were structured exclusively by fine-scale spatial predictors. These results indicate that metacommunity structuring mechanisms for benthic diatoms in the studied streams depend on the evaluated attribute and species rarity. Environmental gradients govern richness in all groups, but spatial processes dominate compositional changes, especially for common and very rare taxa. Rare species are filtered by hydrodynamic conditions, whereas very rare species reflect spatial configuration more than the measured environmental gradients. This study integrates multi-scale predictors and explicitly separates species by rarity, clarifying metacommunity organization in subtropical grassland streams. Ultimately, our findings suggest that diatom species rarity should be considered for effective biomonitoring and biodiversity conservation strategies in subtropical grassland streams.</p></div>","PeriodicalId":8262,"journal":{"name":"Aquatic Ecology","volume":"60 3","pages":""},"PeriodicalIF":2.2,"publicationDate":"2026-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10452-026-10336-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148750530","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}

{"title":"Managing zoosporic infections in microalgae production systems: ecology, detection, risk factors, and biosecurity strategies","authors":"Maja Berden Zrimec,&nbsp;Narcis Ferrer-Ledo,&nbsp;Pietro Marchese,&nbsp;Belen Villarreal Toribio,&nbsp;Ana Gavrilović,&nbsp;Alena S. Gsell,&nbsp;Hans-Peter Grossart,&nbsp;Antonio Ida,&nbsp;Mélissa José,&nbsp;Jurica Jug-Dujaković,&nbsp;Silke van den Wyngaert,&nbsp;Mohamed Abady,&nbsp;Fusun Akgul,&nbsp;Agnés Attard,&nbsp;Selene Chinaglia,&nbsp;Laura Garzoli,&nbsp;Eman M. Fakhry,&nbsp;Esraa E. Fawzy,&nbsp;Thijs Frenken,&nbsp;Daniel Kurpan,&nbsp;Nagwa Mohammady,&nbsp;Amani M. W. Nasser,&nbsp;Dina M. Osman,&nbsp;Cristina Paulino,&nbsp;Serena Rasconi,&nbsp;Ana Sanchez Zurano,&nbsp;Jörg Ullmann,&nbsp;Ghada Youssef,&nbsp;Joāo Varela,&nbsp;Gabriel Acien","doi":"10.1007/s10452-026-10326-x","DOIUrl":"10.1007/s10452-026-10326-x","url":null,"abstract":"&lt;div&gt;&lt;p&gt;Zoosporic parasites represent a pervasive and structurally embedded biosecurity challenge in large-scale microalgae cultivation systems. These fungal and fungal-like organisms, characterised by motile zoospores, combine active host localisation, rapid intracellular development, and long-term persistence through resistant resting stages. Under the high-density, monoculture conditions typical of industrial production, such life-history traits facilitate rapid transmission, nonlinear outbreak dynamics, and recurrent culture collapse. Despite their demonstrated impact on productivity, economic performance, and operational continuity, zoosporic parasites remain insufficiently integrated into routine monitoring frameworks and risk management strategies, with control practices still largely reactive.&lt;/p&gt;&lt;p&gt;This review synthesises current knowledge on the diversity, infection strategies, and life-cycle dynamics of zoosporic parasites affecting microalgae, and links these biological mechanisms to environmental and operational drivers, including irradiance, temperature, nutrient stoichiometry, and pH regulation. A central conclusion emerging from this synthesis is that infection controllability is fundamentally time-dependent. Preventive and containment measures are most effective during early infection stages, when parasite prevalence is low and before intracellular amplification and resting-stage formation dominate system dynamics. Once critical prevalence thresholds are exceeded, management options narrow substantially, shifting from containment to damage limitation through salvage harvesting, system shutdown, and restart.&lt;/p&gt;&lt;p&gt;To address this constraint, we propose a layered, stage-aware diagnostic framework that aligns monitoring tools with their functional role in outbreak detection and response. System-level early-warning indicators provide continuous surveillance but limited specificity; microscopy enables rapid confirmation; flow cytometry supports quantitative assessment of infection prevalence; and molecular tools, including metabarcoding and digital PCR, offer high-resolution taxonomic identification. Emerging digital diagnostics and AI-assisted analytics further enable integration of multi-parametric sensor data and anomaly detection, creating opportunities for anticipatory, data-driven decision support.&lt;/p&gt;&lt;p&gt;Evidence from the ParAqua Survey indicates that late detection and recurrent outbreaks remain common across research and industrial facilities, underscoring a persistent gap between mechanistic understanding and operational implementation. We argue that effective management of zoosporic infections requires an integrated framework combining biosecurity-oriented system design, early-warning diagnostics, quantitative modelling of host–parasite dynamics, and predefined response strategies. Shifting from reactive contamination control toward resilience-oriented, model-informed management is essential for achieving stable, scalable, a","PeriodicalId":8262,"journal":{"name":"Aquatic Ecology","volume":"60 3","pages":""},"PeriodicalIF":2.2,"publicationDate":"2026-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148750551","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":"Single-cell genomics, metagenomics, and transcriptomics of Rhizophydium megarrhizum, an obligate fungal parasite of Planktothrix agardhii","authors":"Katelyn McKindles,&nbsp;Kensuke Seto,&nbsp;Steven Ahrendt,&nbsp;Asaf Salamov,&nbsp;Mansi Chovatia,&nbsp;Mei Wang,&nbsp;Kerrie Barry,&nbsp;Igor V. Grigoriev,&nbsp;R. Michael McKay,&nbsp;Timothy Y. James","doi":"10.1007/s10452-026-10329-8","DOIUrl":"10.1007/s10452-026-10329-8","url":null,"abstract":"<div><p>Chytrids (phylum <i>Chytridiomycota</i>) are zoosporic fungi that play key roles as parasites of aquatic microorganisms, yet they are understudied and genomic resources for algal-infecting chytrids remain scarce. Here, we present the first comparative genomic analysis of multiple isolates of a single chytrid species (order <i>Rhizophydiales</i>) infecting the cyanobacterium <i>Planktothrix agardhii</i>. Isolates were collected from Sandusky Bay, Lake Erie, across two bloom years (2018 and 2019). Using single cell sequencing and metagenomic assembly, we generated individual genomes averaging 15.36 ± 0.12 Mbp in size with ~ 75% completeness, and a pangenome. Gene ontology analyses highlighted the presence of categories related to cellular structure, biosynthetic regulation, and interspecies interactions. As a preliminary exploration of gene expression during infection, we also performed RNA sequencing on a subset of size-sorted samples. These data suggest that chytrids consistently express high levels of cytoskeletal genes, alongside numerous hypothetical proteins, and that zoospores may upregulate carbohydrate-binding proteins implicated in host recognition. On the host side, <i>P. agardhii</i> showed transcriptional shifts in pathways associated with buoyancy and nutrient acquisition, patterns that could represent defensive adjustments or parasite-driven manipulation. Together, this study generates reference genomes for <i>Planktothrix</i>-infective chytrids, identifies conserved gene content across isolates from different bloom years, and provides preliminary transcriptomic insights into parasite and host responses. These resources lay the foundation for deeper investigations into chytrid genome evolution, infection biology, and their ecological roles in shaping cyanobacterial bloom dynamics.</p></div>","PeriodicalId":8262,"journal":{"name":"Aquatic Ecology","volume":"60 3","pages":""},"PeriodicalIF":2.2,"publicationDate":"2026-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13391722/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148576911","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}

{"title":"The sea anemone Aulactinia marplatensis as microhabitat: structure and variation of its associated community","authors":"Stefanía M. Erralde,&nbsp;Agustín Garese,&nbsp;Fabián H. Acuña","doi":"10.1007/s10452-026-10334-x","DOIUrl":"10.1007/s10452-026-10334-x","url":null,"abstract":"<div><p>This study describes the community associated with the exogenous material covering the column of the sea anemone <i>Aulactinia marplatensis</i>, analyzes its composition and diversity, and compares it between two intertidal zones-Las Delicias and Punta Cantera- along the coast of Mar del Plata, Argentina. Over a two-year period, ten individuals of <i>A. marplatensis</i> were seasonally collected at each site; the seasons considered were summer, autumn, winter and spring. The exogenous covering was removed and the associated organisms were identified under a stereoscopic microscope. MDS, PERMANOVA and SIMPER analyses were used to assess differences in community composition, and a two-way ANOVA was applied to compare Simpson’s diversity index between sites and seasons. A total of 22 species were recorded, with syllid polychaetes, mytilids, amphipods and nemerteans as dominant groups. While overall diversity did not differ significantly between sites or seasons, species composition varied both spatially and seasonally. Spatial differences may be due to the higher organic enrichment and contamination exhibited by Las Delicias. Seasonal variations are consistent with previous studies conducted in the study sites and could respond to the reproductive cycles of the species. Our findings support the hypothesis that <i>A. marplatensis</i> functions as an autogenic ecosystem engineer by providing habitat and shelter for a diverse array of associated fauna, including juvenile stages, and highlight its potential role in facilitating habitat complexity within the intertidal zone.</p></div>","PeriodicalId":8262,"journal":{"name":"Aquatic Ecology","volume":"60 3","pages":""},"PeriodicalIF":2.2,"publicationDate":"2026-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148613563","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 mainstream: exploring the spread of Ponto-Caspian gobies into the tributary network of the Dnipro River","authors":"Yuliia Kutsokon,&nbsp;Anatolii Roman,&nbsp;Yuriy Kvach,&nbsp;Oleksii Marushchak,&nbsp;Ladislav Pekárik","doi":"10.1007/s10452-026-10331-0","DOIUrl":"10.1007/s10452-026-10331-0","url":null,"abstract":"<div><p>Ponto‑Caspian gobies are among the most successful freshwater invaders in Europe and North America. Here, we evaluate the spatiotemporal dynamics of these species within the Dnipro River system and place the findings in the context of continental‑scale invasions. Classical sampling surveys were combined with a comprehensive literature synthesis and citizen science data to assess (i) the chronology of colonisation, (ii) upstream spread rates, (iii) habitat associations, and (iv) the Dnipro’s role as a source for other basins. Colonisation of the upper Dnipro tributaries by the monkey goby (<i>Neogobius fluviatilis</i>) dates back to the early 1930s. Subsequent surveys reveal that the monkey goby has now penetrated ~ 70% of the total length of the main tributary network. The western tubenose goby (<i>Proterorhinus semilunaris</i>) and racer goby (<i>Babka gymnotrachelus</i>) are abundant in medium-sized tributaries. In contrast, the round goby (<i>Neogobius melanostomus</i>) and bighead goby (<i>Ponticola kessleri</i>) mainly occur in sites near the Dnipro River mainstream. The findings underscore the need for integrated monitoring and barrier management in regulated river systems to curb further spread of Ponto‑Caspian gobies. Thus, other basin-wide studies in other river systems are required to understand the invasion of Ponto-Caspian gobies.</p></div>","PeriodicalId":8262,"journal":{"name":"Aquatic Ecology","volume":"60 3","pages":""},"PeriodicalIF":2.2,"publicationDate":"2026-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148613312","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":"One hundred years of Ceriantharia (Cnidaria): a mixed-methods review of research trends, biases, and knowledge gaps in tube-dwelling anemones","authors":"Marcela Aparecida de Barros,&nbsp;Gustavo R. de Brito,&nbsp;Sérgio N. Stampar","doi":"10.1007/s10452-026-10333-y","DOIUrl":"10.1007/s10452-026-10333-y","url":null,"abstract":"<div><p>The subclass Ceriantharia comprises tube-dwelling anemones that play important roles in energy flow and the structural organization of marine benthic ecosystems. Although ceriantharians function as habitat-forming organisms and support diverse associated fauna, current knowledge of the group remains fragmented and uneven. We conducted a mixed-methods literature review integrating bibliometric and systematic approaches to synthesize research trends, thematic focus, and knowledge gaps across 89 peer-reviewed studies on Ceriantharia retrieved from the Web of Science Core Collection and Scopus, spanning publications from 1900 to 2024. Our principal research questions were: (1) how has research output on Ceriantharia changed over time; (2) what thematic, geographic, taxonomic, and methodological biases characterize the existing literature; and (3) what environmental information is currently available to characterize the environmental niche of Ceriantharia. Our results reveal pronounced temporal, geographic, taxonomic, and methodological biases. Early research was largely descriptive and taxonomically oriented, whereas recent decades have been characterized by a marked expansion of molecular and phylogenetic studies. Research effort is concentrated in a limited number of ocean basins and taxa, particularly within the family Cerianthidae, while several marine regions and lineages remain poorly investigated. We also identified substantial Wallacean and Grinnellian shortfalls: only 18% of studies reported geographic coordinates for specimen collection, and more than 56% failed to describe habitat characteristics or report environmental variables associated with the sampled organisms. Despite these limitations, the available literature provides a broad overview of the environmental conditions occupied by Ceriantharia, although this characterization remains strongly influenced by geographic and taxonomic sampling biases. We conclude that future progress will depend on expanding ecological investigations across underrepresented species and regions, improving the reporting of spatial and environmental data, and adopting integrative approaches that explicitly link taxonomy, molecular biology, ecology, and biogeography.</p></div>","PeriodicalId":8262,"journal":{"name":"Aquatic Ecology","volume":"60 3","pages":""},"PeriodicalIF":2.2,"publicationDate":"2026-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10452-026-10333-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148466415","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}

{"title":"Warming-induced shifts in phytoplankton dissolved organic carbon release are species-dependent","authors":"Israel Cassiano-Oliveira,&nbsp;Inessa Lacativa Bagatini,&nbsp;Hugo Sarmento","doi":"10.1007/s10452-026-10325-y","DOIUrl":"10.1007/s10452-026-10325-y","url":null,"abstract":"<div><p>Dissolved organic matter (DOM) comprises one of the most abundant forms of carbon in aquatic environments and plays a central role in the global carbon cycle. Phytoplankton is an important DOM source-however, a comprehensive understanding of how global warming impacts the quality, production and accumulation of phytoplankton-derived DOM (DOMp) is still a challenge. Here we subjected axenic cultures of the bloom-forming cyanobacterium <i>Microcystis aeruginosa</i> and the diatom <i>Cyclotella</i> sp. to warming assays (+ 4 °C), with and without acclimation. Samples at different growth stages were analyzed for dissolved organic carbon (DOC) concentration, cell counts by flow cytometry and DOM characterization by fluorescence spectroscopy. Short-term (non-acclimated) warming almost doubled DOC release rates in both species, but returned to baseline levels in <i>M. aeruginosa</i> cultures with long-term (acclimated) warming, while for <i>Cyclotella</i> sp. acclimated cultures these rates varied from baseline to increased values, probably reflecting the known negative effects of sustained temperature increase on many diatom species. Bioavailability proxies consistently increased with warming in <i>M. aeruginosa</i> exudates. In contrast, <i>Cyclotella</i> sp. showed a decline in bioavailability proxies with rising temperature. Coefficients of variation for fluorescent DOM in response to temperature and growth stage are similar, revealing that both factors may contribute equally for the observed shifts in DOMp. These findings indicate that warming can alter the quantity and composition of DOMp, a key resource with potential consequences for community structure and functioning under changing climate scenarios.</p></div>","PeriodicalId":8262,"journal":{"name":"Aquatic Ecology","volume":"60 3","pages":""},"PeriodicalIF":2.2,"publicationDate":"2026-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10452-026-10325-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148466214","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}

{"title":"eDNA metabarcoding reveals spatial differentiation of Arthropoda and Annelida along a coastal urbanization gradient in tropical Indonesia","authors":"Ismail Maqbul,&nbsp;Hawis Madduppa,&nbsp;Dining Nika Alina","doi":"10.1007/s10452-026-10332-z","DOIUrl":"10.1007/s10452-026-10332-z","url":null,"abstract":"<div><p>This study investigates the spatial variability of Arthropoda and Annelida communities across a disturbance gradient in Jakarta Bay and the Thousand Islands, Indonesia, using environmental DNA (eDNA) metabarcoding. Water samples were collected from four sites, Pramuka, Harapan, Untung Jawa, and Tanjung Priok, representing a continuum from protected marine areas to heavily urbanized coasts. Amplicon sequencing of the COI gene region recovered a total of 324 genera, with the highest genus richness at Harapan (119) and Pramuka (107), intermediate richness at Untung Jawa (100), and the lowest at Tanjung Priok (40). Alpha diversity indices (Observed, Chao1, Shannon, Simpson, Fisher) consistently indicated higher diversity at the less-disturbed sites. Community clustering distinguished Pramuka–Harapan from Untung Jawa–Tanjung Priok, with the former dominated by copepods (e.g., <i>Paracalanus</i>, <i>Stephos</i>) and the latter showing a higher proportion of annelids (e.g., <i>Phyllodoce</i>, <i>Ampharete</i>). Because all multivariate and univariate analyses were based on four site-level observations, they were treated as exploratory and not tested for statistical significance; exploratory redundancy analysis (RDA) indicated that salinity and dissolved oxygen were the environmental variables most strongly associated with genus-level differences among sites, and site-level correlations described genus–environment associations (e.g., for <i>Oithona</i>). Visualization tools—including Sankey diagrams, dendrograms, and bar plots, illustrated spatial differentiation in community composition. Our findings demonstrate that eDNA metabarcoding can capture among-site biodiversity differences and environmental gradients in tropical coastal systems, supporting its application as a complementary tool for biodiversity monitoring and marine spatial planning under urbanization pressure.</p></div>","PeriodicalId":8262,"journal":{"name":"Aquatic Ecology","volume":"60 3","pages":""},"PeriodicalIF":2.2,"publicationDate":"2026-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148466122","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}