Abundance and diversity of diatoms and dinoflagellates in an embayment off Central Chile (30°S): evidence of an optimal environmental window driven by low and high frequency winds DOI Creative Commons

Bárbara Jacob,

Orlando Astudillo, Boris Dewitte

et al.

Frontiers in Marine Science, Journal Year: 2024, Volume and Issue: 11

Published: Oct. 24, 2024

The relationship between phytoplankton abundances and wind forcing in upwelling systems involves a number of processes that make the nonlinear nature. In particular, although upwelling-favorable winds tend to provide nutrients for growth, they can also induce export both biomass open ocean through Ekman eddy-induced transport, or dilution populations vertical mixing, which negatively impacts increase biomass. These are essentially interact antagonistically synergistically on overall coastal accumulation Consequently, producers consumers decline above certain threshold despite input nutrient-enriched water. We have observed this phenomenon an embayment off Central Chile (30°S), where almost 10 years (2000-2009) microphytoplankton data were analyzed together with environmental variables phenology. Our findings showed abundance, species diversity evenness diatoms dinoflagellates all increased post-2005 when mean alongshore surface stress reached maximum value 0.026 N m -2 , at decadal temporal variability scale. was associated changing phase Pacific Decadal Oscillation (PDO) from positive (warm) negative (cold) phases, decrease intra-seasonal activity. Both abundance community peaked during period whereas higher frequency harmful algal blooms (e.g. Pseudo-nitzschia australis ) prior 2005. suggest low-frequency (decadal) variations transition PDO combined reduction (periods shorter than 2 months) after 2005 provided “optimal window” ecosystem.

Language: Английский

Influences of dissolved organic matter on phytoplankton functional diversity and resource use efficiency differ in three lakes with contrasting trophic state and depth DOI

Zhirong Yu,

Di Song, Jingyi Li

et al.

Aquatic Sciences, Journal Year: 2025, Volume and Issue: 87(2)

Published: Feb. 3, 2025

Language: Английский

Citations

0
Water Quality and Its Influence on Waterbird Habitat Distribution: A Study Along the Lieve River, Belgium DOI Open Access
Xingzhen Liu, Long Ho, Andrée De Cock

et al.

Water, Journal Year: 2025, Volume and Issue: 17(4), P. 595 - 595

Published: Feb. 19, 2025

Freshwater ecosystems face increasing pressures from human activities, leading to degraded water quality and altered habitats for aquatic species. This study investigates the relationship between waterbird distribution along Lieve River, Belgium, based on manually conducted counts data collected 48 transects in March 2024. Localized eutrophication was evident, with TN (2.7–5.6 mg L−1), TP (up 0.46 chlorophyll-a (median 70 ppb) exceeding environmental thresholds. Prati index analysis revealed that 58.3% of sampling points River were categorized as “polluted”, reflecting extensive degradation. Eurasian coots (71.4%) wild ducks (72.4%) predominantly found polluted areas, thriving nutrient-enriched linked high levels. In contrast, common moorhens (80.3%) preferred acceptable indicating higher requirements. These findings indicate phosphate is a key driver waterbody eutrophication, evidenced by concentrations measured on-site, which far exceed thresholds set standards. Future research should explore advanced monitoring approaches improve assessments, ensuring conservation one Europe’s oldest artificial canals, protection its habitats.

Language: Английский

Citations

0
Effects of Artificial Reefs on the Macrobenthic Community Structure Through Functional Trait Analysis DOI Open Access
Jiao Wang,

Shaoyu Jiang,

Debin Sun

et al.

Aquatic Conservation Marine and Freshwater Ecosystems, Journal Year: 2025, Volume and Issue: 35(2)

Published: Feb. 1, 2025

ABSTRACT Artificial reefs enhance marine biodiversity by increasing habitat complexity and heterogeneity, which in turn provide living space for various species. Macrobenthos, an important component of aquatic ecosystems, with limited mobility sensitivity to environmental changes, commonly serve as indicators ecosystem health. This study, conducted the summer autumn 2022 Sishili Bay (SB) Changdao Archipelago (CA), Yantai, China, aimed evaluate effects artificial on macrobenthic community structure using functional trait analysis. The nonmetric multidimensional scaling (nMDS) analysis based species abundance occurrence frequency did not reveal any clear separation between areas inside outside reefs. However, construction increased number macrobenthos, especially Mollusca Feeding type, a key trait, distinguished reefs, significant spatial temporal variations. driving differences reef nonreef include carnivorous Lumbrineris longifolia Glycinde bonhourei omnivorous Eriopisella sechellensis Sigambra bassi , were pivotal observed variations relative abundance. Functional richness (FRic) ( S ) showed consistent patterns variation, both contributing improving stability summer. autumn, was reduced extraordinary dominance single Multiple factors rather than one significantly influenced distribution diversity, reflecting complex interplay seasonal dynamics. study used assess impact structure, offering more effective measure species‐level assessments.

Language: Английский

Citations

0
Phytoplankton community diversity, dominance, and rarity: a case study of tropical urban lakes DOI Creative Commons
Marlon Pablo Miranda Martins, Khályta Willy da Silva Soares, Priscilla Carvalho

et al.

Acta Limnologica Brasiliensia, Journal Year: 2024, Volume and Issue: 36

Published: Jan. 1, 2024

Abstract Aim The aim of this study was to evaluate how phytoplankton community diversity, dominance, and rarity are influenced by different local environmental conditions in urban lakes. We expect that richness will be negatively lakes with higher nutrient concentrations high turbidity, while abundance positively influenced. Thus, these have greater dominance a few species lower rarity, the opposite less turbidity. Methods Phytoplankton abiotic variables samples were collected fourteen distributed municipality Goiânia, Goiás, Brazil, during rainy period. Results It possible identify an heterogeneity among identified separation according density, especially due contribution green algae, desmids, cyanobacteria. Most showed diversity evenness values, predominance rare taxa dominant species. main associated water temperature, dissolved oxygen, concentrations. Conclusions Therefore, based on their relationship can important model for assessing quality

Language: Английский

Citations

1
Spatio-seasonal variations in functional trait composition and diversity patterns of marine fish communities in coastal waters DOI
Jianhua Wang, Bo Xu,

C Zhang

et al.

Marine Ecology Progress Series, Journal Year: 2024, Volume and Issue: 744, P. 115 - 131

Published: July 25, 2024

Despite the consensus that distribution of functional traits within a community provides insights into assembly and maintenance mechanisms, few studies have explored spatio-seasonal variations in patterns marine fish communities. Seven context 2 distinct groups—habitat use trophic niche—were selected to assess richness (FRic), evenness (FEve), dispersion (FDis) across various scales. Community-weighted mean redundancy analysis (CWM-RDA) was used identify impact environmental factors on dominant traits. We found seasonal spatial community, notably influenced by latitudinal-depth gradient (from shallower stations north deeper south), east-west (longitudinal) dynamics, temperature gradient. Latitude negatively correlated with CWM values most trait categories. FRic showed more pronounced than other indices, higher observed autumn. Fish assemblages displayed similarity winter seasons, lower FRic, FEve, FDis. Overall, our findings illustrate undergo continuous formation dissolution different seasons zones, resulting forms diversity patterns.

Language: Английский

Citations

1
Abundance and diversity of diatoms and dinoflagellates in an embayment off Central Chile (30°S): evidence of an optimal environmental window driven by low and high frequency winds DOI Creative Commons

Bárbara Jacob,

Orlando Astudillo, Boris Dewitte

et al.

Frontiers in Marine Science, Journal Year: 2024, Volume and Issue: 11

Published: Oct. 24, 2024

The relationship between phytoplankton abundances and wind forcing in upwelling systems involves a number of processes that make the nonlinear nature. In particular, although upwelling-favorable winds tend to provide nutrients for growth, they can also induce export both biomass open ocean through Ekman eddy-induced transport, or dilution populations vertical mixing, which negatively impacts increase biomass. These are essentially interact antagonistically synergistically on overall coastal accumulation Consequently, producers consumers decline above certain threshold despite input nutrient-enriched water. We have observed this phenomenon an embayment off Central Chile (30°S), where almost 10 years (2000-2009) microphytoplankton data were analyzed together with environmental variables phenology. Our findings showed abundance, species diversity evenness diatoms dinoflagellates all increased post-2005 when mean alongshore surface stress reached maximum value 0.026 N m -2 , at decadal temporal variability scale. was associated changing phase Pacific Decadal Oscillation (PDO) from positive (warm) negative (cold) phases, decrease intra-seasonal activity. Both abundance community peaked during period whereas higher frequency harmful algal blooms (e.g. Pseudo-nitzschia australis ) prior 2005. suggest low-frequency (decadal) variations transition PDO combined reduction (periods shorter than 2 months) after 2005 provided “optimal window” ecosystem.

Language: Английский

Citations

0