Life history strategies predict responses of lacustrine fish communities to eutrophication

The Science of The Total Environment, Год журнала: 2024, Номер 951, С. 175684 - 175684

Опубликована: Авг. 22, 2024

Язык: Английский

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Patterns and drivers in the functional diversity decomposition of invaded stream fish communities

Diversity and Distributions, Год журнала: 2024, Номер unknown

Опубликована: Сен. 1, 2024

Abstract Aim The assembly of real‐world ecological communities in human‐modified landscapes is influenced by a complex interplay spatial, temporal, environmental and invasion gradients. However, understanding the relative importance these drivers their interactions shaping functional remains elusive. Our study aimed to investigate influence on stream fish metacommunity. Location Streams Lake Balaton catchment, Hungary. Methods We analysed long‐term (18‐year) dataset metacommunity, focusing changes diversity (Q), redundancy (R) species dominance (D). Ternary diagrams were utilized decompose into Q, R D components visualize patterns. Linear mixed‐effect regression separate structural equation models employed identify significant D. Results Native exhibited low (Q) but high (D), indicating convergence dominance. Stream habitat size, network position associated physical chemical gradients emerged as consistently R. Changes Q additionally linked non‐native community properties subtle shifts land use within‐stream characteristics. Main Conclusions findings suggest that both filtering interspecies interactions, particularly trait similarity between invaders natives shape metacommunities. Despite minimal temporal directional changes, predominantly patterns native communities, overshadowing effects. underscore considering mechanisms assembly. Additionally, joint application decomposition frameworks with predictive modelling provides comprehensive insight across communities.

Язык: Английский

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Study on Enhancement of Denitrification Performance of Alcaligenes faecalis

Separations, Год журнала: 2023, Номер 10(12), С. 597 - 597

Опубликована: Дек. 8, 2023

Nitrogen pollution in water bodies presents a serious threat to ecosystems due its role eutrophication. In this study, the aerobic denitrifying bacterium Alcaligenes faecalis was used as model microorganism investigate optimal operating conditions for nitrogen removal from nitrogen-containing wastewater by under different aeration modes, microbial dosages and C/N ratios. The results showed that mode efficient bacterial denitrification 10 min of with 30 interval, total reached 87.82%. At doses, NO3−–N completely denitrified NO2−–N accumulation levels were reduced, all which resulted significant denitrification, final efficiencies 86.39–98.50%. With an increase ratio, pollutant performance bacteria increased. When ratio 17, rates NO3−–N, TN COD 100%, 98.50% 96.13%, respectively. lower ratios, growth metabolism microorganisms inhibited fewer electron acceptors available during process, seriously affected performance. explored experiments using changes mode, dosage treating nitrogenous indicated. This provides technical support improving remediation effect theoretical basis further in-depth research on future.

Язык: Английский

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Functional diversity explores the maintenance mechanism and driving factors of the invasion equilibrium state of the icefish (Neosalanx taihuensis Chen) in Lake Fuxian, China

Journal of Fish Biology, Год журнала: 2024, Номер unknown

Опубликована: Окт. 21, 2024

Abstract Biodiversity loss caused by biological invasions is an ecological problem on a global scale, and understanding the mechanism of invasion basis for managing non‐native species. The biotic resistance hypothesis proposes that species‐rich native communities are less susceptible to because limited resources available species, therefore comparing resource utilization patterns different can reveal mechanisms specific species at community level. We selected Lake Taihu, where icefish ( Neosalanx taihuensis Chen) originated, Fuxian, invaded, as research objects. calculated fish functional diversity indexes, including richness (FRic), evenness (FEve), divergence (FDiv), reflect differences in niche based four quarterly survey data from two lakes. random forests model explored relationship between indexes environmental variables. Our results showed more diverse (high FRic), space (low FEve), competitive pressure FDiv) Fuxian were identified critical important factors maintaining current equilibrium state after successful icefish. bottom‐up effects mainly affected Fuxian. They differed those Taihu primarily influenced top‐down effects. Enhancing limiting zooplankton controlling This study offers new perspective studying mechanism, provides scientific guidance

Язык: Английский

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Effect of capping mode on control of phosphorus release from sediment by lanthanum hydroxide

Environmental Science and Pollution Research, Год журнала: 2023, Номер 30(32), С. 79026 - 79048

Опубликована: Июнь 6, 2023

Язык: Английский

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