Eutrophication increases the similarity of cyanobacterial community features in lakes and reservoirs

Water Research, Год журнала: 2023, Номер 250, С. 120977 - 120977

Опубликована: Дек. 6, 2023

Язык: Английский

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Shaping beta diversity in arid landscape through native plant species contributions: synergy of climate, soil, and species traits

Frontiers in Plant Science, Год журнала: 2025, Номер 16

Опубликована: Март 10, 2025

Understanding how species traits, climate aridity, and soil resources interact to influence beta diversity is critical for predicting changes in plant community composition. This study aims investigate these interactions shape contributions spatial turnover diversity, focusing on the unique dryland ecosystems of Saint Katherine Protectorate (SKP) Egypt. To address this, we analyzed data from 84 vegetation plots, considering direct indirect effects climatic resources, traits (e.g., height, leaf production, specific area), as well relative abundance C3 plants phylogenetic contribution (SCBDeff). Using Generalized Linear Models (GLMs) Structural Equation Modelling (SEMs), results revealed complex aridity SCBDeff mediated by traits. was positively influenced particularly with greater distance, taller plants, high a higher plants. Conversely, area (SLA) had negative effect. Phylogenetic emerged significant driver distantly related contributing more due functional differentiation niche partitioning. The findings emphasize role environmental conditions shaping diversity. These insights can inform conservation strategies aimed at enhancing ecosystem stability under shifting conditions, environments where adaptive play pivotal role.

Язык: Английский

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Ecological uniqueness of fish assemblages and species contributions to beta diversity are affected by river-lake disconnection

Reviews in Fish Biology and Fisheries, Год журнала: 2025, Номер unknown

Опубликована: Фев. 5, 2025

Язык: Английский

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Local environment and fragmentation by drought and damming shape different components of native and non-native fish beta diversity across pool refuges

The Science of The Total Environment, Год журнала: 2024, Номер 930, С. 172517 - 172517

Опубликована: Апрель 17, 2024

Pool refuges are critical for maintaining stream fish diversity in increasingly intermittent streams. Yet, the patterns and drivers of beta native non-native pool remain poorly known. Focusing on Mediterranean streams, we decomposed into richness difference (RichDiff) species replacement (Repl), local (LCBD, LCBD

Язык: Английский

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Local environmental and spatial factors are associated with multiple facets of riverine fish β‐diversity across spatial scales and seasons

Freshwater Biology, Год журнала: 2023, Номер 68(12), С. 2197 - 2212

Опубликована: Окт. 10, 2023

Abstract Disentangling the factors governing community structure across various spatial and temporal scales is a core task in ecology biogeography, because it could provide valuable insights into biodiversity conservation management. The relative role of environmental (a proxy for niche‐based mechanism) dispersal) effects shaping ecological communities depends on diversity facets, network positions, seasonality biological characteristics focal organisms. However, such patterns are not well understood fish large river systems, especially if all these examined simultaneously. We investigated taxonomic, functional phylogenetic total β ‐diversity (and their turnover nestedness phenomena) at different (basin vs. section scales) seasons (wet dry seasons) subtropical system (the Chishui River basin, China). also quantified importance variables by using generalised dissimilarity modelling. At basin scale, taxonomic mainly reflected turnover, yet contributed likewise to ‐diversity. Taxonomic were strongly correlated ( r from 0.39 0.87), whereas both facets relatively weakly 0.27 0.65). Generalised modelling suggested that phenomena consistently more influenced 16.1%, 22.4%) than 6.7%, 4.8%). (turnover 13.8%, 6.4%) 4.3%, 9.4%) accounted greater proportion variations nestedness, respectively. only as significantly differed between headwater downstream sections. Furthermore, primarily explained (15.7%) (12.7%) wet season, while (25.9%; 7.7%) dominated season. By contrast, (17.9%; 8.3%) (11.0%) (11.5%) Our results highlight that, compared with ‐diversity, accounting helps reveal distinct patterns, potential controls. Given community–environment relationships contribution varied scales, our study underlines long‐term dynamics metacommunity studies. findings suggest maintaining heterogeneity adequate hydrological connectivity would be essential diversity. Overall, advances current knowledge maintenance mechanisms adding multi‐faceted seasonality, which has rarely been done rivers.

Язык: Английский

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Elevational patterns of fish functional and phylogenetic community structure in a monsoon climate river basin

Diversity and Distributions, Год журнала: 2024, Номер 30(4)

Опубликована: Фев. 13, 2024

Abstract Aim Understanding the patterns and drivers of biodiversity across space time is commonly based on species diversity, which may ignore species' functional role evolutionary history result in an incomplete understanding community assembly. It suggested that integrating species, functional, phylogenetic diversity could provide a more holistic assessment assembly natural ecosystems. This study aimed to explore elevational environmental multiple facets fish structure subtropical river during wet dry seasons. Location The Chishui River basin, China. Methods We investigated responses richness, elevation different Moreover, we compared dispersion mean pairwise distance with those obtained from null models infer mechanisms shaping structure. Additionally, examined (e.g. water chemistry, temperature, size) Results Fish showed negative relationship basin. communities tended be average functionally random but phylogenetically clustered. Furthermore, exhibited decreasing pattern along gradient. Despite no significant seasonal changes for (except diversity), became overdispersed clustered at low high elevations season. variables were not synchronous. Conclusions At basin scale, filtering was prevalent structure, whereas stochasticity likely important ecological individual switched limiting similarity as increased, underlying forces two ends gradient prominent

Язык: Английский

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Integrating spatiotemporal hydrological connectivity into conservation planning to protect temporary rivers

Aquatic Conservation Marine and Freshwater Ecosystems, Год журнала: 2024, Номер 34(3)

Опубликована: Март 1, 2024

Abstract Temporary rivers (TRs) have been largely overlooked in conservation assessments. Because TRs are such dynamic ecosystems, spatial and temporal aspects of their hydrology ecology need to be taken into account when designing plans. The aim this paper is propose a set recommendations that could useful for managers do this, using seasonal diatom macroinvertebrate data from north‐eastern Spain as case study. Beta diversity was partitioned local species contributions beta (LCBD SCBD). Additionally, priority sites covering the distribution all were identified Marxan selection frequency (MSF) served measure relative irreplaceability each site. Using both approaches (beta Marxan), effects changing spatiotemporal connectivity habitat heterogeneity on prioritization conserved assessed. It found LCBD MSF ranged widely space time. However, weakly related. adequately represented taxa by selecting few sites, while selected communities with higher differentiation but not necessarily those rare species. In addition, SCBDs assigned low values taxa, thus care must index planning. Spatiotemporal played critical role at regional scales, driving site prioritization. Overall, we recommend: 1) monitoring multiple hydrological phases encompass different community types capturing total diversity; 2) combination, benefit complementary insights; 3) integrating isolation plans, since they main drivers variation over time TRs.

Язык: Английский

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Assessing Site and Species Associations With Beta Diversity of Fish Assemblages in Amazonian Streams

Freshwater Biology, Год журнала: 2025, Номер 70(1)

Опубликована: Янв. 1, 2025

ABSTRACT The increasing environmental changes threatening the fish fauna of streams are driving a growing interest in understanding how sites and species contribute to diversity, as this is important information for decision‐making related management conservation priority areas species. objective study was understand factors, spatial distance between streams, land use, cover (landscape) may be associated with uniqueness assemblages Amazonian streams. We sampled characterised conditions 29 within around Tapajós River basin, near Amazon National Park Brazil. Each stream studied along 150‐m stretch. variables local contribution beta diversity (LCBD) were vegetation presence refuges. Streams inside outside park showed similar contributions diversity. Species richness abundance negative relationship LCBD, suggesting that unique tended have few low abundance. contributed most (SCBD) had intermediate occurrence, high abundance, non‐marginal niches. did not observe an effect niche breadth on SCBD, both generalist specialist equally Our findings underscore role ecological uniqueness. Sites composition also exhibit demonstrates importance conserving biodiversity face changes. By examining species, we highlight considering habitat quality protecting these ecosystems against challenges global change.

Язык: Английский

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Non-native species drive the global loss of freshwater fish beta-diversity

NeoBiota, Год журнала: 2025, Номер 97, С. 257 - 277

Опубликована: Фев. 24, 2025

Freshwater ecosystems are facing mounting challenges. The widespread introduction of non-native species, for example, has resulted in the loss native species and substantial reconfiguration diversity patterns across regions. Documenting such impacts remains critical informing national-level biosecurity policies. Here, we explore changes biogeographic freshwater fish response to spread teasing apart geographic (watersheds) taxonomic (species) drivers at global scale. We leveraged databases occurrence estimate unique contributions local watersheds (native origin) beta-diversity domains. Beta-diversity metrics a domain scale can be interpreted as their importance uniqueness composition. report significant with largest Ethiopian, Nearctic Palearctic domains, even though non-natives decreased contribution all particularly known impacts. Watersheds identified most important promoting were not evenly distributed influenced by geographical isolation compositions composed many endemic threatened species. Highest values enhancing mainly observed although mean higher non-threatened Species from had wide ecological tolerances, were, general, natives, endemics and/or IUCN threat status. Our findings underscore consequences shaping fishes Anthropocene.

Язык: Английский

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Species that dominate spatial turnover can be of (almost) any abundance

Ecography, Год журнала: 2025, Номер unknown

Опубликована: Март 4, 2025

An ongoing quest in ecology is understanding how species commonness influences compositional change. While each species' contribution to beta diversity (SCBD) depends both on its abundance and widespread it (e.g. occupancy) a general expectation for these lacking. Using published data 9924 across 177 metacommunities, we modelled relative SCBD as function of occupancy using correlative mechanistic regression models (the latter derived from population demographic theory). Although the model provided superior fit data, results suggest with infrequent combinations (high mid‐high that make dominant diversity. The nature their interaction most apparent when depicted abundance–occupancy sample space, which shows probability making concave‐up abundance. Species found an intermediate number sites (0.56) required smallest share total (0.05) top‐decile contribution. Simulations varying evenness conspecific spatial patterns support main findings show variations strength aggregation predominantly result observed relationship between space illustrates empirical abundance‐SCBD relationships can be linear or unimodal provides framework understand global change processes. To preserve turnover, should prioritized.

Язык: Английский

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