Acta Oecologica-International Journal of Ecology最新文献

{"title":"Corrigendum to “High sensitivity of vessel size to climate, but decreasing potential hydraulic conductivity in a centennial Nothofagus obliqua remnant population of south-central Chile” [Acta Oecol. 132 (2026) 104194]","authors":"Mathias Legue, Rocío Urrutia-Jalabert, Moisés Rojas-Badilla, Álvaro González-Reyes, Tania Gipoulou-Zúñiga, Isadora Schneider-Valenzuela, Danny E. Carvajal, Carmen G. Rodríguez, Ariel Muñoz","doi":"10.1016/j.actao.2026.104195","DOIUrl":"10.1016/j.actao.2026.104195","url":null,"abstract":"","PeriodicalId":55564,"journal":{"name":"Acta Oecologica-International Journal of Ecology","volume":"132 ","pages":"Article 104195"},"PeriodicalIF":1.8,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148935042","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":"Ballistic dispersal and hydrochorous potential in Desmotes incomparabilis, a vulnerable endemic shrub of Coiba Island, Panama","authors":"Eloisa Lasso ,&nbsp;Alicia Ibáñez","doi":"10.1016/j.actao.2026.104176","DOIUrl":"10.1016/j.actao.2026.104176","url":null,"abstract":"<div><div>Islands are centers of endemism but are also among the most vulnerable ecosystems to climate change. Warming, altered precipitation regimes, and sea-level rise threaten island biodiversity, making dispersal a critical process for population persistence and colonization. Understanding dispersal mechanisms is essential for conservation, particularly in island endemics with narrow ranges. We documented fruit maturation, seed dispersal, and seed tolerance to freshwater and seawater exposure in <em>Desmotes incomparabilis</em>, a shrub that is classified as Vulnerable by the IUCN and the sole species of an endemic genus restricted to Coiba Island, Panama. Using video recordings and controlled laboratory observations, we documented seed release, dispersal distance and direction. In a separate experiment, we assessed the potential for secondary dispersal via hydrochory by exposing seeds to freshwater and seawater for one week and then evaluating germination. Seeds of <em>D. incomparabilis</em> were explosively ejected to distances between 0.05 and 4.6 m, with most falling within 1.5 m of the launch position. Dispersal was directionally biased toward northeast under fully controlled indoor conditions. Germination declined from 67% in control seeds to 52% after freshwater exposure and 40% after seawater exposure. This suggests that occasional water-mediated transport may extend dispersal distances beyond the ballistic shadow. Where water-mediated transport occurs, secondary hydrochory may help mitigate some of the demographic and genetic limitations associated with short-distance ballistic dispersal. By linking dispersal mechanism, dispersal distance, directionality, and tolerance to water exposure, this study provides a framework for evaluating conservation risks in narrowly endemic island plants exposed to sea-level rise and habitat fragmentation.</div></div>","PeriodicalId":55564,"journal":{"name":"Acta Oecologica-International Journal of Ecology","volume":"131 ","pages":"Article 104176"},"PeriodicalIF":1.3,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148183825","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":"Evaluating biotic interactions in a hard and fragile ecosystem: xerophilous land snails and epilithic cryptogram communities in rocky outcrops","authors":"Paula Gavarró ,&nbsp;Vicenç Bros ,&nbsp;Llorenç Sáez ,&nbsp;Xavier Santos ,&nbsp;Joan Real ,&nbsp;Daniel Pons ,&nbsp;Roger Puig-Gironès","doi":"10.1016/j.actao.2025.104153","DOIUrl":"10.1016/j.actao.2025.104153","url":null,"abstract":"<div><div>In biodiversity hotspots like rocky outcrops, species distribution is shaped by environmental factors at multiple scales, with microhabitat characteristics like substrate composition and shelter playing key roles. These fragile ecosystems host a rich diversity of species, including endemic and endangered taxa. However, they remain underexplored in conservation research, despite their crucial role in sustaining xerophilic biodiversity. This study investigates the environmental drivers of xerophilous communities, specifically on land snails and epilithic cryptograms, in a Mediterranean Natural Park. Specifically, we examine how substrate composition influences species assemblages and their biotic relationship. Our field data and statistical models reveal that substrate heterogeneity, comprising conglomerates, pebbles, and sand, creates microclimatic conditions that support diverse communities. Land snails are particularly associated with larger pebbles that provide shelter and moisture retention, while epilithic species thrive on conglomerates and finer materials that stabilize microhabitats. Minimal overlap in habitat preferences between snails and epilithic suggests niche partitioning and complex biotic interactions, highlighting the importance of substrate diversity in sustaining biodiversity. From a conservation perspective, we propose conservation strategies focussed on preserving substrate structural diversity within rocky outcrops to maintain vital habitat features for xerophilous species. Management policies should integrate microhabitat-scale considerations to enhance ecosystem resilience and mitigate disturbances from human and wildlife activities. This research not only advances our understanding of invertebrate ecology in extreme habitats but also offers valuable insights for the conservation of other biodiversity-rich ecosystems facing similar challenges.</div></div>","PeriodicalId":55564,"journal":{"name":"Acta Oecologica-International Journal of Ecology","volume":"130 ","pages":"Article 104153"},"PeriodicalIF":1.3,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145841355","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":"Soil seed bank diversity and physicochemical properties in the Dichrostachys cinerea-encroached savanna: Implications for vegetation restoration in the semi-arid of central Tanzania","authors":"Paulo C. Athumani,&nbsp;Naza E. Mmbaga,&nbsp;Francis Chebby","doi":"10.1016/j.actao.2025.104149","DOIUrl":"10.1016/j.actao.2025.104149","url":null,"abstract":"<div><div>Bush encroachment poses significant threats to African rangelands. Restoring these ecosystems effectively requires understanding the interaction between vegetation cover, soil seed bank (SSB), and soil properties. This study investigates the influence of <em>Dichrostachys cinerea</em>-dominance on the SSB, aboveground vegetation, and soil properties in a semi-arid region, central Tanzania. We hypothesized that <em>Dichrostachys cinerea</em> encroachment affects SSB and understory vegetation diversity through competitive exclusion and alters soil chemistry, while maintaining sufficient reserves for passive restoration. Aboveground vegetation cover was visually estimated, SSB composition and abundance were assessed using the seedling-emergence method, while soil properties were measured following standard procedures. Plant and SSB diversity were calculated using the Shannon-Wiener index. One-way ANOVA and NMDS compared Shannon-Weiner's diversity between aboveground vegetation and the SSB, while Welch's two-sample <em>t</em>-test compared Shannon-Weiner's diversity between the <em>Dichrostachys cinerea</em>-dominated portion and the open patches. Pearson's correlation explored relationships between aboveground vegetation, SSB abundance, and soil chemical variables. Results revealed a grass-dominated SSB (71.3 % abundance, 4 seedlings m⁻²) with nine species absent aboveground, indicating latent diversity for restoration. Soil fertility was moderate (pH 6.35, CEC 20.5 cmol/kg). High soil salinity and potassium negatively correlated with SSB abundance (r = −0.67 and −0.64, respectively, p &lt; 0.05), while organic carbon positively correlated with aboveground vegetation (r = 0.53, p &lt; 0.05). Shannon-Wiener diversity differed significantly between seasons and SSB (F = 95.66, p &lt; 0.05), while also varied between the <em>Dichrostachys cinerea</em>-dominated area and open patches (<em>t</em> (20.21) = 6.96, p &lt; 0.05). These findings suggest that while passive restoration is feasible due to the diverse SSB and moderate soil fertility, active interventions like targeted fertilisation and herbivore reintroduction may enhance grass recovery and prevent re-encroachment. This study highlights the importance of integrating SSB and soil property assessments for effective savanna restoration, offering insights for global rewilding initiatives.</div></div>","PeriodicalId":55564,"journal":{"name":"Acta Oecologica-International Journal of Ecology","volume":"130 ","pages":"Article 104149"},"PeriodicalIF":1.3,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145718905","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":"Mesohabitat structure may be as important as stream riparian habitats in driving the variation in functional diversity of Neotropical stream fish","authors":"Dyego Leonardo Ferraz Caetano ,&nbsp;Edson Fontes de Oliveira ,&nbsp;Cláudio Henrique Zawadzki","doi":"10.1016/j.actao.2025.104150","DOIUrl":"10.1016/j.actao.2025.104150","url":null,"abstract":"<div><div>The aim of this study was to investigate the influence of riffle and pool mesohabitats and riparian habitats on the functional traits of fish assemblages in Neotropical streams. Sampling of the physical and chemical factors of streams and fish took place in July and August 2016, in 24 sections of 20 streams located in the basins of the Ash River and Paranapanema 1. 22 ecomorphological indices and functional traits related to diet, feeding tactics, preferred habitat and biomass were used to compose the functional diversity matrices. The influences of environmental factors and the similarities and dissimilarities of fish assemblages between mesohabitats and between stretches with different riparian habitats were verified. There were significant differences between the mesohabitats in the indices of functional diversity. The parameters of the mesohabitats were considered more important descriptors related to functional diversity than the factors related to the constitution of the riparian habitats. However, it is important to conserve the riparian habitats of a body of water throughout its entire length, and not just a few stretches, as seen in this study, which may have reflected in the similarity between stretches with conserved and impacted riparian habitats. The results show the influence of multiple mesohabitat factors on the functional structure of fish communities in streams, emphasizing the importance of aquatic habitat heterogeneity in ecological research.</div></div>","PeriodicalId":55564,"journal":{"name":"Acta Oecologica-International Journal of Ecology","volume":"130 ","pages":"Article 104150"},"PeriodicalIF":1.3,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145799001","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":"Formicides application in eucalyptus plantations and their temporal effects on composition of ground-dwelling ants in adjacent forest fragments","authors":"Kênia A. dos Santos Mateus ,&nbsp;Willian L.S. Paiva ,&nbsp;Daniele de L. Braga ,&nbsp;Carla R. Ribas ,&nbsp;Antônio C.M. Queiroz ,&nbsp;Ronald Zanetti","doi":"10.1016/j.actao.2025.104148","DOIUrl":"10.1016/j.actao.2025.104148","url":null,"abstract":"<div><h3>Justification/objective</h3><div>Ants perform important functions in natural environments such as soil structuring, nutrient cycling, herbivory, predation, and dispersal of diaspores. However, some ants, like the leaf-cutting ants, are the main eucalyptus pests and are the targets of formicide baits, when ingested, has a lethal effect. These baits are considered non-selective for ants in general. Therefore, we aimed to assess the effects over time of the formicide baits on the ant richness and composition of non-target ground-dwelling ants and on the seed dispersal rate in forest fragments adjacent to eucalyptus plantations.</div></div><div><h3>Methods</h3><div>We applied the formicide baits inside the eucalyptus plantations and on the edge of forest fragments. We evaluated the richness and composition of ground-dwelling ants and the seed dispersal rate into adjacent forest fragments 30 days before and 30, 120, and 180 days after the application of the formicide baits.</div></div><div><h3>Results</h3><div>The application of ant bait in eucalyptus plantations did not affect the ant species richness in adjacent forest fragments, and this variable remained stable over time after treatment. However, the application of ant bait altered seed removal rates both when applied within eucalyptus plantations and in forest fragments, indicating functional impacts on ant-mediated ecological processes. Furthermore, the application of bait in forest fragments resulted in a temporary change in the composition of ant communities compared to fragments where bait application occurred only in eucalyptus, with noticeable changes detected 30 days after application. In these areas, after 120 days of application, the species composition returned to conditions similar to those observed before the bait application. The application of ant bait affected the composition of the ant community, with species exclusivity varying between environments: 38.5 % of the species were found only in the area without bait, 16.9 % at the edge of the forest with bait and 17.7 % in the eucalyptus area with bait.</div></div><div><h3>Conclusion</h3><div>The formicide baits application does not change ant richness by ground-dwelling ants but modify the ground-dwelling ant community composition and seed removal rates in adjacent forests fragments. Additionally, species losses, temporary appearances, and changes in occurrence frequency were observed, indicating both immediate and long-term impacts on community structure, especially in forest fragments and eucalyptus areas with formicide baits application. Therefore, we recommend baits application only inside the eucalyptus plantations and not into forest fragments edges around plantations, as it can affect species composition.</div></div>","PeriodicalId":55564,"journal":{"name":"Acta Oecologica-International Journal of Ecology","volume":"130 ","pages":"Article 104148"},"PeriodicalIF":1.3,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145841356","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":"Role of biomass allocation strategy in enhancing the invasiveness of Croftonweed (Ageratina adenophora) across diverse habitats of Kumaun Himalaya","authors":"Kavita Khatri ,&nbsp;Kiran Bargali ,&nbsp;Surendra S. Bargali","doi":"10.1016/j.actao.2025.104152","DOIUrl":"10.1016/j.actao.2025.104152","url":null,"abstract":"<div><div>Biomass allocation is one of the important functional traits responsible for resources attainment, and plasticity in biomass allocation reflects a plant's response to varying environmental conditions. This study compared in-situ biomass allocation to different plant parts of an invasive weed <em>Ageratina adenophora</em> in different populations growing across different altitudinal ranges and habitats. Two altitudinal ranges viz., low altitudinal range (1000–1500 m) and high altitudinal range (1500–2000 m) invaded by <em>A. adenophora</em> were selected and at each altitude, six habitats common to both altitudinal ranges were identified. During the reproductive period of <em>A. adenophora</em> i.e., in the months of March and April, twenty-four quadrats of 1 × 1 m size were randomly laid and three plants from each quadrat were carefully dug out without disturbing the roots. Plants were transported to the laboratory, washed to remove soil particles, separated into different components, oven dried and weighed. The results indicated that at each site, <em>A. adenophora</em> allocated maximum biomass to the stem. ANOVA showed significant differences in biomass allocation between the two altitudinal ranges indicating the high adjustment capacity of <em>A. adenophora</em>. High altitude populations allocated more biomass to roots and inflorescence while, low altitude populations allocated more biomass to stems and leaves. Across habitats, allocation to leaves, stem and reproductive parts showed significant differences. High allocation of photosynthates to the shoot portion is a key trait that directs invasive plant development and enables endurance under changing plant densities. <em>A. adenophora</em> possesses plastic biomass partitioning behavior which helps this weed to establish highly dense stands in different habitats.</div></div>","PeriodicalId":55564,"journal":{"name":"Acta Oecologica-International Journal of Ecology","volume":"130 ","pages":"Article 104152"},"PeriodicalIF":1.3,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145841357","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":"Variation in bird diversity and composition between elevations and human land-use types in a seasonally dry tropical forest","authors":"Andrea Nieto ,&nbsp;Lea Kerwer ,&nbsp;Boris A. Tinoco ,&nbsp;Eike Lena Neuschulz ,&nbsp;Matthias Schleuning","doi":"10.1016/j.actao.2025.104154","DOIUrl":"10.1016/j.actao.2025.104154","url":null,"abstract":"<div><div>Climate seasonality and human land-use are major pressures shaping biodiversity in tropical dry regions and both are expected to intensify in the near future. Therefore, understanding the interplay of these factors is crucial for mitigating biodiversity loss in these rapidly changing ecosystems. We examined the effects of seasonality (i.e., wet and dry seasons) and human land-use types (i.e., natural forests and silvopastures) on taxonomic and functional diversity, and community composition of birds in a seasonally dry tropical forest in southern Ecuador. We repeatedly recorded birds in 12 1-ha plots across natural forests and silvopastures at two elevations (600 and 1200 m a.s.l.) using point counts, and classified the bird community into primary (i.e., nectarivores, frugivores, granivores and omnivores) and secondary (i.e., invertivores) consumers. Functional bird diversity based on four morphological traits was not affected by human land-use type or seasonality, while taxonomic diversity of the overall community and of secondary consumers increased with elevation. The taxonomic diversity of primary consumers was higher in silvopastures compared to natural forests. The composition of the overall bird community and that of primary and secondary consumers differed between elevations. Seasonality had no effect on diversity nor on composition. Our study shows that elevation is a major driver of bird diversity and community composition in seasonally dry tropical forests, indicating that even short elevational gradients shape bird communities in these ecosystems. Protecting continuous elevational transects of dry tropical forests is therefore essential to maintain their high bird diversity under current and future conditions.</div></div>","PeriodicalId":55564,"journal":{"name":"Acta Oecologica-International Journal of Ecology","volume":"130 ","pages":"Article 104154"},"PeriodicalIF":1.3,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145841358","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":"Ecology of photosynthetic pathways in contrasting Venezuelan plant communities","authors":"Nelson Ramírez,&nbsp;Herbert Briceño","doi":"10.1016/j.actao.2026.104156","DOIUrl":"10.1016/j.actao.2026.104156","url":null,"abstract":"<div><div>The frequency distribution of species with C₃, C₄ and CAM carbon metabolic pathways and their relationship with climate (temperature and precipitation), altitude, functional groups (life forms, epiphytism, succulence and parasitism) and habitat type (disturbed or undisturbed) were evaluated for 27 plant communities. The frequency of C₄ species only tended to increase with temperature, and the frequency of CAM species tended to decrease with the increase in precipitation. The C₃ species were prevalent across all life forms, but C₄ species were restricted to perennial and annual herb life forms. CAM species occurred over all life forms, but was positively associated with perennial herbs. The frequency of C₄ species was generally higher in disturbed habitats, while CAM species were more abundant in undisturbed habitats. The frequency of C₄ species differed significantly according to vegetation type, being higher in meadows and shrublands, and lower in dry and wet forests. By using the frequencies of the photosynthetic pathways as a grouping variable, communities were sorted into heterogeneous sets. Thus, the mesothermic shrublands, riparian wet forest and savanna–forest ecotone had 3–7.5 % of C₄ species and between 1 and 4 % of CAM species, and secondary deciduous forest, dwarf cloud forest and cloud forest with 1–8 % of C₄ and 7–9 % CAM species. Communities with no C₄, and 6.7–9.8 % of CAM species were the dry forest, riparian dry forest and sub–páramo; and mangrove, páramo, gallery forest and cloud forest (Altos de Pipe) with no or very low frequencies of C₄ and CAM species. Herbaceous communities were separated into those with high frequencies of C₄ species (11.1–16.7 %), and those (herbaceous communities and xerophytic shrublands) with high frequencies of both C₄ (9.4–27.1 %) and CAM (0–21.9 %) species. Our results show that the frequency distribution of species with different photosynthetic pathway types is associated with functional groups, altitude, climatic, and disturbance at the community level.</div></div>","PeriodicalId":55564,"journal":{"name":"Acta Oecologica-International Journal of Ecology","volume":"130 ","pages":"Article 104156"},"PeriodicalIF":1.3,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147396698","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":"Influence of abiotic variables on the diversity and co-occurrence of fish assemblages in streams of the paranapanema basin, Brazil","authors":"Dyego Leonardo Ferraz Caetano ,&nbsp;Edson Fontes De Oliveira ,&nbsp;Maria Gabriela Utida ,&nbsp;Cláudio Henrique Zawadzki","doi":"10.1016/j.actao.2025.104155","DOIUrl":"10.1016/j.actao.2025.104155","url":null,"abstract":"<div><h3>Aim</h3><div>This study investigated the relationship between the structure and co-occurrence patterns of the fish fauna and the physical and chemical characteristics of three streams in southern Brazil, evaluating the effects of spatial and temporal scales on these relationships.</div></div><div><h3>Methods</h3><div>Abiotic data and fish fauna were sampled quarterly from October 2012 to July 2013 in three sampling units of each stream (Água dos Anjos, Monjolinho, and Ubá, upper Paraná River basin). The structure of the assemblage was analyzed using α, β, and γ diversity indices, and the co-occurrence patterns were assessed through the null model C-score. Species abundance patterns were related to abiotic variables through Spearman's Correlation and Canonical Correlation Analysis.</div></div><div><h3>Results</h3><div>The diversity patterns of the fish assemblages were influenced by physical, chemical, and hydrological characteristics, showing a positive effect of conductivity and flow on diversity patterns. The general assemblages showed structure patterns different from those observed randomly. The results were influenced by the structure of the Água dos Anjos stream, indicating the interference of physical and chemical parameters, biotic interactions, and seasonality in the fish assemblages.</div></div><div><h3>Conclusions</h3><div>This study indicates that interactions between fish assemblages and the environment significantly affect species distribution, diversity, and co-occurrence, providing evidence that environmental factors such as ion concentration, conductivity, and flow influence the formation of spatiotemporal structure patterns.</div></div>","PeriodicalId":55564,"journal":{"name":"Acta Oecologica-International Journal of Ecology","volume":"130 ","pages":"Article 104155"},"PeriodicalIF":1.3,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145884847","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}