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

Water Research, Journal Year: 2023, Volume and Issue: 250, P. 120977 - 120977

Published: Dec. 6, 2023

Language: 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, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 5, 2025

Language: 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, Journal Year: 2025, Volume and Issue: 16

Published: March 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.

Language: Английский

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

Ecography, Journal Year: 2025, Volume and Issue: unknown

Published: March 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.

Language: Английский

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Site and species contribution to beta diversity of phytoplankton communities in lakes of a tropical floodplain

Hydrobiologia, Journal Year: 2025, Volume and Issue: unknown

Published: March 21, 2025

Language: Английский

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Unraveling Spatial Patterns and Drivers of Fish Ecological Uniqueness in Subtropical Streams

Ecology and Evolution, Journal Year: 2025, Volume and Issue: 15(4)

Published: March 27, 2025

ABSTRACT β‐diversity is effective for measuring the degree of compositional variation among communities and can be decomposed into local (LCBD) species (SCBD) contributions to β‐diversity. Previous studies on have mostly been limited taxonomic level; relatively few conducted functional diversity its two components based traits, which seriously hindered potential application in conservation biology. In addition, increasing anthropogenic disturbance has led uncertainties fish stream ecosystems. this study, we explored relationships between multidimensional regional landscape factors, environmental community metrics, traits reveal main drivers headwater streams Xin'an River, China. LCBD SCBD values were calculated abundance that is, contribution (TLCBD TSCBD, respectively) (FLCBD FSCBD, The results showed affected by biological factors. Among drivers, TLCBD positively related abundance. FLCBD abundance, originality, specialization, dispersion, sampling sites with greater ecological uniqueness at level also had level. negatively water temperature, substrate coarseness, agricultural urban land use, use changes reduce studied streams. For SCBD, both TSCBD FSCBD occupancy, niche position. We suggest consideration as part a approach needs coupled will help prioritize areas restoration study region.

Language: Английский

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Effects of upwelling and submarine groundwater discharges on phytoplankton communities off the north coast of the Yucatan peninsula

Frontiers in Marine Science, Journal Year: 2025, Volume and Issue: 12

Published: April 1, 2025

Introduction Coastal regions around the world are influenced by numerous dynamical processes that supply nutrients for primary producers and trigger food web. Rivers, submarine groundwater discharges (SGD), sediment suspension events, upwelling, amongst more important. However, it is not just concentration, but also composition of nutrient determines type phytoplankton community develops, subsequently influencing entire It therefore necessary to better understand link between physical processes, response in coastal oceans. This study investigates effects upwelling on a wide shallow continental shelf. Methods Results achieved using numerical modeling dispersion as well field data obtained from three oceanographic cruises, each representing different hydrographic scenario (“No upwelling”, “Minor SGD” “Major minor SGD”). The upwelled water mass (SUW – Subtropical Underwater) was primarily found at eastern end shelf (Cabo Catoche), where rises transported westward advection. stations showed an increase diatom species population, known thrive environments with abundant inorganic nutrients. In contrast, were recorded nearshore western half shelf, mainly related karst features hydrogeological importance (a sinkhole ring associated Chicxulub crater). SGD influence had higher presence such NH4, suggesting recycling processes. can modify either advected Cabo Catoche, or promote local growth, leading dominance dinoflagellates unknown flagellates. Discussion result implies web, similar mixoplankton-dominated microbial loop, which would be fed organic matter origin.

Language: Английский

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

Diversity and Distributions, Journal Year: 2024, Volume and Issue: 30(4)

Published: Feb. 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

Language: 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, Journal Year: 2024, Volume and Issue: 930, P. 172517 - 172517

Published: April 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

Language: Английский

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

Freshwater Biology, Journal Year: 2025, Volume and Issue: 70(1)

Published: Jan. 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.

Language: Английский

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