Revealing the influence of hyporheic water exchange on the composition and abundance of bottom-dwelling macroinvertebrates in a temperate lowland river

Knowledge and Management of Aquatic Ecosystems, Journal Year: 2021, Volume and Issue: 422, P. 37 - 37

Published: Jan. 1, 2021

We studied distributions and abundances of macroinvertebrates in relation to hyporheic water exchange (HWE) patterns the upper Biebrza − a small, lowland, low dynamic European river located Northeast Poland. On 6-km stretch river; we determined variability zone by using direct field measurements pressure gradient determine groundwater–surface interactions. identified locations with upwelling downwelling fluxes HWE as well ambiguous hydraulic contact between groundwater surface along river. In these locations, sampled bottom-dwelling macroinvertebrates. total, 627 individuals benthic 34 taxa were identified. revealed that macroinvertebrate fauna is more abundant diverse stretches where from infiltrates zone. Results also show higher taxonomic richness diagnosed infiltrating conditions (downwelling flux zone) compared drained (upwelling zone), but recorded differences not statistically significant.

Language: Английский

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Hyporheic flow in aquatic Ranunculus habitats in temperate lowland rivers in Central Europe

Ecological Indicators, Journal Year: 2023, Volume and Issue: 153, P. 110422 - 110422

Published: June 9, 2023

The study attempted to assess the influence of filtration stream and hydraulic gradient in hyporheic zone on distribution water crowfoot (Ranunculus sect. Batrachium) common temperate lowland river type two European ecoregions: (14) Central Plains (16) Eastern Plains. A novel filtrometer a meter were employed for flow measurements at 24 sites distributed throughout Europe between 2017 2019. At majority sites, zones covered with Ranunculus vegetation found be dominated by groundwater drainage. Moreover, intensity supplied via varied, ranging from 0.0017 m3 d−1·m−2 0.4118 d−1·m−2. It was also determined that average non-vegetated parts riverbed 0.6065 d-1·m−2, whereas it five times lower overgrown clumps, amounting 0.1190 d−1 m−2. provides quantification interactions exchange growth species, indicating surface is an important environmental factor stimulates various taxa. evidence new indicator, specifically importance rivers conservation planning implementing nature-based management methods.

Language: Английский

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Impact of anthropogenic infrastructure on aquatic and avian predator–prey interactions in a modified lowland river

Freshwater Biology, Journal Year: 2023, Volume and Issue: 69(1), P. 157 - 171

Published: Nov. 17, 2023

The relationship between aquatic and avian predators prey is a fundamental process that influences the ecological dynamics of freshwater communities; landscape fear underpins spatial temporal habitat use prey, i.e., non-consumptive predation effects. For example, complex marginal vegetation other natural in-river refuges are known to be important for manage risk must alter their behaviour in response patches occupy. However, it unclear how respond predators, vice versa, heavily modified degraded lowland rivers with high degree river maintenance measures; component critical flood management globally. Such modifications could lead seeking refuge at hazardous anthropogenic infrastructure, but robust quantification predator–prey interactions this context required develop understanding. Using multi-beam sonar (Dual-Frequency Identification Sonar), we non-invasively simultaneously quantified rate interactions, attack pumping station intake during winter river. Prey fish experienced temporally dynamic, density-dependant, species-specific risks from two dissimilar (i.e., vs. avian); pike (Esox lucius) cormorant (Phalacrocorax carbo). Generalised linear modelling revealed was positively associated predator rate. Non-consumptive effects were evidenced by changes shoal structure (density, area), shoaling (group aggregation), schooling (coordinated directional movement), including diurnal migrations refuge. Our results show absence habitats shifted speculate paradoxically dependant on intake, These findings strongly enhance our understanding impact infrastructure demonstrating management, measures, can behavioural game played prey.

Language: Английский

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Land Cover Effects on Selected Nutrient Compounds in Small Lowland Agricultural Catchments

Land, Journal Year: 2021, Volume and Issue: 10(2), P. 182 - 182

Published: Feb. 10, 2021

The influence of landscape on nutrient dynamics in rivers constitutes an important research issue because its significance with regard to water and land management. In the current study spatial temporal variability N-NO3 P-PO4 concentrations their dependence was documented Świder River catchment central Poland. From April 2019 March 2020, samples were collected from fourteen streams monthly timescale correlated cover metrics based Corine Land Cover 2018 Sentinel 2 Global datasets. It that agricultural lands forests have a clear seasonal impact concentrations, whereas effect meadows weak direction dependent dataset. application buffer zones increased correlation performance, Euclidean distance scaling improved mainly for forest concentration not significantly related metrics, as driven by hydrological conditions. obtained results provided new insight into landscape–water quality relationships lowland landscape, special focus evaluating predictive performance different

Language: Английский

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Longitudinal dispersion affected by willow patches of low areal coverage

Hydrological Processes, Journal Year: 2022, Volume and Issue: 36(6)

Published: May 25, 2022

Abstract Vegetation notably influences transport and mixing processes can thus be used for controlling the fate of substances in hydro‐environment. Whilst most work covers fully vegetated conditions, novelty this paper is to focus on flows with real‐scale flexible willow patches. We aimed investigate how longitudinal dispersion varies according spatial distribution, density coverage patches evaluate explanatory power predictors that consider hydraulics, vegetation channel geometry. Salt tracer experiments were performed a trapezoidal where we established 3–4 m long 1–1.6 wide artificial foliated willows reproduced shapes plant densities observed woody‐vegetated floodplains. examined sparsely distributed low areal/volumetric 6–11%, non‐vegetated conditions reference. Flow depths surface widths 0.7–0.9 6–7 m, respectively, mean flow velocities ranged at 0.3–0.6 m/s. The emergent generated from negligible over four‐fold increase when compared conditions. preferential location low‐velocity areas, such as near banks, or high blockage cross‐sectional area ⪆0.4, led largest residence times. Patches under configurations enhanced normalized differential velocity defined difference between highest (90th percentile) lowest (10th divided by velocity, increasing shear dispersion. As existing analytical failed estimate effect different patch configurations, proposed change corresponding basic predictor reach‐scale coefficient patchy vegetation. In contrast, no clear relationship resistance Thus, our findings indicated bankside may allow reduced peak concentrations lengthened times, supporting pollutant management, while ensuring good conveyance. Such rare field‐scale analyses improve estimation solute real flows.

Language: Английский

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