Twenty-eight years of ecosystem recovery and destabilisation: Impacts of biological invasions and climate change on a temperate river

The Science of The Total Environment, Год журнала: 2023, Номер 875, С. 162678 - 162678

Опубликована: Март 8, 2023

Most river ecosystems are exposed to multiple anthropogenic stressors affecting the composition and functionality of benthic communities. Identifying main causes detecting potentially alarming trends in time depends on availability long-term monitoring data sets. Our study aimed improve knowledge about community effects that is needed for effective, sustainable management conservation. We conducted a causal analysis detect dominant hypothesised stressors, such as climate change biological invasions, reduce biodiversity thus endanger ecosystem stability. Using set from 1992 2019 macroinvertebrate 65-km stretch upper Elbe Germany, we evaluated alien species, temperature, discharge, phosphorus, pH abiotic conditional variables taxonomic functional analysed temporal behaviour metrics. observed fundamental changes community, with shift collectors/gatherers filter feeders feeding opportunists preferring warm temperatures. A partial dbRDA revealed significant temperature species abundance richness. The occurrence distinct phases development metrics suggests temporally varying impact different stressors. Taxonomic richness responded more sensitively than diversity whereas redundancy metric remained unchanged. Especially last 10-year phase, however, showed decline an unsaturated, linear relationship between richness, which rather indicates reduced redundancy. conclude over three decades, mainly invasions change, affected severely enough increase its vulnerability future highlights importance emphasises careful use metrics, preferably considering also composition.

Язык: Английский

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Water quality deterioration remains a major stressor for macroinvertebrate, diatom and fish communities in German rivers

The Science of The Total Environment, Год журнала: 2023, Номер 907, С. 167994 - 167994

Опубликована: Окт. 22, 2023

About 60 % of Europe's rivers fail to meet ecological quality standards derived from biological criteria. The causes are manifold, but recent reports suggest a dominant role hydro-morphological and water quality-related stressors. Yet, in particular micropollutants hydrological stressors often tend be underrepresented multiple-stressor studies. Using monitoring data four Federal States Germany, this study investigated the effects 19 stressor variables six groups (nutrients, salt ions, dissolved oxygen/water temperature, mixture toxicity 51 micropollutants, alteration morphological habitat quality) on three assemblages (fishes, macroinvertebrates, benthic diatoms). Biological were analyzed for 35 community metrics quantified using Random Forest (RF) analyses put into hierarchical context. To compare metric responses, grouped categories reflecting important characteristics communities, such as sensitivity, functional traits, diversity composition well composite indices that integrate several one single index (e.g., class). Water - not turned out dominate responses all assemblages. In contrast, less pronounced stronger than Explained variances RF models ranged 23-64 16-40 diatoms 18-48 fishes. Despite high variability across groups, sensitivity tended reveal individual higher explained variance indices. results (physico-chemical) deterioration continues impact many German rivers, despite extensive progress wastewater treatment during past decades. detect deterioration, schemes need target relevant physico-chemical micropollutants. Furthermore, needs measures flow magnitude dynamics). At present, surveys rarely address degree alteration. order achieve good status, river restoration management both Restricting just organism group macroinvertebrates) or only selected class) may hamper identification its classification and, thus mislead management.

Язык: Английский

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Long-term trends in stream benthic macroinvertebrate communities are driven by chemicals

Environmental Sciences Europe, Год журнала: 2023, Номер 35(1)

Опубликована: Дек. 6, 2023

Abstract Background Recent studies indicate a partial recovery of European stream macroinvertebrate diversity. However, the key determinants shaping overall community trends are only partly explored, owing to insufficient long-term environmental data collected in parallel with responses. We investigate communities (i.e., taxonomic and trait composition metrics), explore their relationships diverse drivers land-use, runoff, water temperature, in-stream chemicals). use annually spring summer between 2007 2021 at four sampling sites within Rhine-Main-Observatory Long-Term Ecological Research site. These encompass gradient from less-disturbed disturbed conditions. Results Over time, shifts metrics indicated an improvement Long-term biological mirrored those for metrics; example, increases over time richness were paralleled by functional dispersion. Meanwhile, ecological particularly driven changes drivers. Land-use, runoff explained around 20% variance communities. Water temperature land-use played relatively equal roles metric responses spring, while emerged as most influential driver summer. when incorporating chemical more direct measurement increased c.a. 50% both seasons. Conclusions Examining relevant variables beyond climate improves insights into why biodiversity exhibits trends. call increase initiatives link monitoring

Язык: Английский

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EVALUACIÓN DE TEMPERATURA EN CULTIVO INTENSIVO DEL Litopenaeus vannamei EMPLEANDO RAZONAMIENTO DIFUSO

CICIMAR Oceánides, Год журнала: 2025, Номер 39(2), С. 35 - 50

Опубликована: Март 18, 2025

Los organismos acuáticos son susceptibles de sufrir estrés cuando las condiciones ecológicas no adecuadas. La temperatura del agua es un parámetro gran importancia debido a que afecta reacciones bioquímicas y fisiológicas en los acuáticos. Asimismo, influye considerablemente la concentración oxígeno disuelto, por lo resulta necesario evaluar supervisar este parámetro. En trabajo, se presenta modelo computacional para evaluación estanques cultivo intensivo camarón blanco Litopenaeus vannamei, mediante el estudio 3 factores fundamentales: promedio, variación amplitud duración cambios temperatura. Mediante sistema razonamiento difuso, evalúa cada factor medio reglas establecidas, obteniendo indicador impacto sobre hábitat cultivo. resultados compararon contra índices calidad U.S. National Sanitation Foundation (NSF) Canadian Council of Minister Environment (CCME), más comúnmente usados. Se muestra mejor comportamiento diurna temperatura, cual penaliza una manera adecuada abruptos considerado otros índices.

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Contributions of source populations, habitat suitability and trait overlap to benthic invertebrate community assembly in restored urban streams

Ecological Processes, Год журнала: 2025, Номер 14(1)

Опубликована: Апрель 25, 2025

Abstract Background Understanding the temporal development of community assembly processes is essential for assessing recovery degraded ecosystems after restoration. Community in restored streams often slow or absent, due to inadequate restoration, catchment-scale pressures, and/or colonisation barriers. Recovery involve three key filters: dispersal, environmental conditions and biotic interactions. Dispersal critical initial colonisation, while influence successful population establishment. Lastly, as available niches fill, interactions, such competition, gain importance. Despite presence many theories on how these filters interact during assembly, they have rarely been investigated simultaneously. Our detailed species- site-specific approach allowed us analyse a hierarchical analysis. We assessed effect filters, by examining benthic invertebrate communities at 20 sites Boye catchment (Western Germany). The most its tributaries were used open sewers century, i.e. concrete channels transporting untreated sewage before gradual restoration was started 1990s. bank reinforcements beds removed, riparian vegetation left natural succession. Accordingly, grouped 'unimpacted', 'recently restored' (< 4 years), 'mature (> 10 years). An additional 28 provided information distances source populations, species’ habitat suitability filtering. Biotic (interaction) filtering evaluated through trait overlap Results Communities recently differed from mature unimpacted sites, resembled ones. Taxa had nearer those better matched present habitats. Trait did not differ between absent taxa. Conclusions results indicate that dispersal early stages, with mass effects upstream sources supporting taxa found despite low suitability. Over time, became more influential, shaping communities. Competition appeared relatively unimportant, yet competitive exclusion may explain small proportions sites. Hence, effectively support stream recovery, it consider different operate various stages process. For example, could further develop if availability increases, connectivity populations would only play minor role.

Язык: Английский

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An empirically derived riparian forest preference index for lowland stream macroinvertebrates

Ecological Indicators, Год журнала: 2025, Номер 175, С. 113547 - 113547

Опубликована: Май 6, 2025

Язык: Английский

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The hierarchy of multiple stressors’ effects on benthic invertebrates: a case study from the rivers Erft and Niers, Germany

Environmental Sciences Europe, Год журнала: 2022, Номер 34(1)

Опубликована: Окт. 8, 2022

Abstract Background A variety of anthropogenic stressors influences the ecological status rivers wordwide. Important include elevated concentrations nutrients, salt ions, heavy metals and other pollutants, habitat degradation flow alteration. Some tend to remain underrepresented in multiple-stressor studies, which particular is apparent for micropollutants (e.g. pesticides, pharmaceuticals) alterations regime. This case study analysed compared effects 19 different stressor variables on benthic macroinvertebrates two German Erft Niers (Federal State North Rhine-Westphalia, Germany). The were assigned four groups (physico-chemical stress, mixture toxicity 42 micropollutants, hydrological alteration morphological degradation) put into a hierarchical context according their relative impact macroinvertebrate community using redundancy analysis subsequent variance partitioning. Results results suggest strong unique effect physico-chemical yet at same time reveal also joint variables. Morphological showed subordinate effects. Notably, only minor share explained was attributed these specific catchments. Conclusions hierarchy indicates that management measures improving still need address water quality issues both rivers. stress might imply common source catchment areas: lignite mining drainage, urban area effluents wastewater treatment plants. findings point important role regime, often unconsidered hydro-morphological surveys.

Язык: Английский

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Improved thermal preferences and a stressor index derived from modeled stream temperatures and regional taxonomic standards for freshwater macroinvertebrates of the Pacific Northwest, USA

Ecological Indicators, Год журнала: 2024, Номер 160, С. 111869 - 111869

Опубликована: Март 1, 2024

Benthic macroinvertebrate taxa vary in their sensitivities to water quality and habitat conditions, contributing extensive use as ecological indicators. As climate change landscape alteration increasingly impact stream temperatures, interest is growing expanding our knowledge of how macroinvertebrates are affected by current future thermal conditions. Using samples from 3501 sites, we evaluated relationships between modeled temperatures across Oregon Washington, the U.S. Pacific Northwest. We used Maximum Weekly Temperature (MWMT) values NorWeST temperature dataset, which same metric for numeric standards Washington. MWMT captures peak stress, when cold-water adapted aquatic biota closest upper physiological limits. For each taxon, characterized distributions with three measures: 1) central tendency, based on weighted average (WA) optima calculations relative abundance data; 2) lower limits, 10th 90th percentiles taxon occurrence, using presence 3) sensitivity curve shape, Generalized Additive Model (GAM) plots. assigned 521 taxa, species phyla, seven preference categories, ranging cold warm stenotherms (narrow range) eurythermal (wide range). Thermal variability within taxonomic group were identified establishing targets regional monitoring programs. also developed Macroinvertebrate Tolerance Index (MTTI) represent assemblage-level response available habitats, WA abundances 324 taxa. The MTTI model had a strong relationship (R2 = 0.68) root-mean-square-error 2.5 °C. Our work builds previous national efforts identify indicator network that corresponds directly standards. Both preferences can be help causes biological impairment, prioritize restoration protection actions, monitor assemblage-wide changes tolerance over time.

Язык: Английский

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Species specific responses to stressors hamper Trichoptera recovery

The Science of The Total Environment, Год журнала: 2024, Номер 945, С. 173992 - 173992

Опубликована: Июнь 18, 2024

Worldwide, aquatic biodiversity is severely threatened as a result of anthropogenic pressures such pollution, habitat destruction and climate change. Widescale legislation resulted in reduced nutrient- pesticide loads, restoration measures allowed modest recovery freshwater biodiversity. However, from 2010 onwards, the otherwise unrestored habitats stagnated. The aim present study was therefore to reveal long-term trends an landscape explain observed patterns. To this end, over 40 years biomonitoring data indicative taxa group Trichoptera (caddisflies), with exceptionally high spatial temporal resolution, employed. Periods recovery, stagnation, decline were delineated using linear non-linear modelling approaches. Subsequently, species grouped based on abundance patterns time grouping used ascertain species-specific responses stressors trait-based approach. Richness all jointly, well five most abundant remaining 136 species, significantly increased 1980 significant breakpoints after which these metrics, except abundances 5 abundant, declined significantly. Trend-based groupings not explained by biological traits or ecological preferences. increasing less sensitive change poor water quality, concerned benefited measures. Species stable declining showed higher sensitivity indicated that conditions non-protected restored did improve due top other pressures. These observations reinforce need for efforts only moderately water- quality landscapes halt further ecosystem degradation turn losses again into recoveries.

Язык: Английский

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A modelling approach to assess climate change impacts on taxonomic and functional diversity of European stream macroinvertebrates: Implications for water quality monitoring

Ecological Indicators, Год журнала: 2024, Номер 166, С. 112404 - 112404

Опубликована: Июль 26, 2024

Язык: Английский

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