Effects of Suspended Sediment Transport on Invertebrate Drift

Béjar, M.; Gibbins, Christopher; Vericat, Damià; Batalla, Ramón J.

doi:10.1002/rra.3146

Cited by 35 publications

(37 citation statements)

References 37 publications

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“…Discharge ( Q ) and suspended sediment transport were recorded (15‐min data) at Ainsa (at the downstream end of the study reach) during the previous month in order to characterize conditions experienced by macroinvertebrates immediately prior to sampling (for more details, see Béjar, and Béjar, Gibbins, Vericat, & Batalla, ); Q was also monitored during the sampling period. Figure illustrates the design for data collection and postprocessing, as needed to assess the influence of habitat conditions on benthic invertebrates.…”

Section: Study Area and Methodsmentioning

confidence: 99%

Influence of habitat heterogeneity and bed surface complexity on benthic invertebrate diversity in a gravel‐bed river

Béjar

Gibbins

Vericat

et al. 2020

River Research & Apps

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Maintaining or restoring physical habitat diversity is a central tenet of sustainable river management, yet a link between habitat and ecological diversity in fluvial systems has long remained equivocal. The lack of consistent evidence partly reflects the problems of characterizing habitat in ways that are ecologically meaningful. This paper assesses the influence of habitat heterogeneity and complexity on macroinvertebrate assemblages in a mountain gravel‐bed river. With the use of 0.1‐m resolution data obtained from an acoustic Doppler current profiler, heterogeneity and complexity in hydraulic conditions and bed topography were characterized using 13 metrics applied to 30 areas, each 1 m2, with an invertebrate sample collected from each area. Turnover of invertebrate taxa (i.e., β‐diversity) between sampled areas was rather limited, but observed differences in diversity were related significantly to several metrics of habitat heterogeneity. Invertebrate abundance was related to habitat diversity, patch size coefficient of variation, and patch size, whereas the Shannon diversity was related to the number of patches and patch size. None of the habitat complexity metrics accounted for a significant amount of observed variation in invertebrate communities between sampled areas. The paper demonstrates that high‐resolution data can help reveal relationships between habitat and benthic invertebrate diversity.

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Section: Study Area and Methodsmentioning

confidence: 99%

Influence of habitat heterogeneity and bed surface complexity on benthic invertebrate diversity in a gravel‐bed river

Béjar

Gibbins

Vericat

et al. 2020

River Research & Apps

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“…El caudal para todo el año hidrológico 2013-2014 osciló entre 5,2 m 3 /s y 477 m 3 /s (representado éste último valor un caudal pico de crecida con un periodo de retorno de 5 años según Llena et al, 2016). Los caudales durante los días de estudio (días 6 y 18) fueron 6,9 y 7,0 m 3 /s respectivamente (para más detalles ver Béjar et al 2017). Estos valores son igualados o superados un 93% del tiempo.…”

Section: Hidrología E Hidráulicaunclassified

“…C SS máxima en verano 27,8 g/l, Lobera et al, 2016b). Es interesante señalar también que las altas concentraciones alcanzadas durante los días de actuación en el cauce alteraron por ejemplo la deriva de macroinvertebrados en el tramo de estudio (para más detalles consultar Béjar et al, 2017).…”

Section: P a P E R A C C E P T E D P R E -P R I N T V E R S I O Nunclassified

“…Newcombe y Macdonald (1991) ya demostraron cómo la biota acuática responde tanto a los cambios puntuales en la C SS como a la duración de la exposición. En el caso del Cinca dichos efectos se describen en el trabajo recientemente publicado por Béjar et al (2017).…”

Section: Carga Sólidaunclassified

“…Ambos factores son importantes ya que tienen efectos sobre la biota acuática (p.ej. deterioro de órganos respiratorios, abrasión, deriva involuntaria; Bilotta y Brazier, 2008;Béjar et al, 2017). A largo plazo las extracciones de áridos tienen también efectos en el balance sedimentario del tramo fluvial donde se localizan.…”

Section: Consideraciones Finalesunclassified

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Efectos de las extracciones de áridos sobre el transporte de sedimentos en suspensión en ríos de montaña (alto río Cinca, Pirineo Central)

Béjar

Vericat

Nogales

et al. 2018

CIG

Self Cite

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This paper examines the effects of gravel mining on the suspended sediment transport in the Upper River Cinca (Central Pyrenees). Discharge, sediment transport and sediment grain-size distribution were measured, sampled and further determined in five monitoring sections along a 5-km river reach. Samples were taken at a section upstream from the mined area (i.e. reference section) and in four sections downstream (0, 200, 500 and 1500 meters). The results show that sediment concentrations downstream from the target site were up to one order of magnitude higher than in the reference section. Average concentrations during the impact were similar to those observed during floods, with maximum values attaining 6 g/l. Total load ranged from 2.2 to 17 Mg/day between sections; these values include the effects of the earth-moving works performed before the mining started. Concentrations at the lowermost section of the study reach were similar to those observed at the upstream reference section, suggesting that most of the suspended material was deposited in the channel. The transported material was coarse than that sampled under reference conditions; nevertheless, largest particles settled quickly, suggesting a selective transport downstream. This study constitutes a first step towards a better understanding of local sediment dynamics in rivers affected by maintenance works and related activities, such as gravel mining, and, overall, supports the comprehensive assessment of the effects of human actions on channel morphodynamics and the ecological functioning of mountain fluvial systems.

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Using source‐specific models to test the impact of sediment source classification on sediment fingerprinting

Vercruysse

Grabowski

2018

Hydrological Processes

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Sediment fingerprinting estimates sediment source contributions directly from river sediment. Despite being fundamental to the interpretation of sediment fingerprinting results, the classification of sediment sources and its impact on the accuracy of source apportionment remain underinvestigated. This study assessed the impact of source classification on sediment fingerprinting based on diffuse reflectance infrared Fourier transform spectrometry (DRIFTS), using individual, source-specific partial leastsquares regression (PLSR) models. The objectives were to (a) perform a model sensitivity analysis through systematically omitting sediment sources and (b) investigate how sediment source-group discrimination and the importance of the groups as actual sources relate to variations in results. Within the Aire catchment (United Kingdom), five sediment sources were classified and sampled (n = 117): grassland topsoil in three lithological areas (limestone, millstone grit, and coal measures); riverbanks; and street dust. Experimental mixtures (n = 54) of the sources were used to develop PLSR models between known quantities of a single source and DRIFTS spectra of the mixtures, which were applied to estimate source contributions from DRIFTS spectra of suspended (n = 200) and bed (n = 5) sediment samples. Dominant sediment sourceswere limestone topsoil (45 ± 12%) and street dust (43 ± 10%). Millstone and coals topsoil contributed on average 19 ± 13% and 14 ± 10%, and riverbanks 16 ± 18%.Due to the use of individual PLSR models, the sum of all contributions can deviate from 100%; thus, a model sensitivity analysis assessed the impact and accuracy of source classification. Omitting less important sources (e.g., coals topsoil) did not change the contributions of other sources, whereas omitting important, poorlydiscriminated sources (e.g., riverbank) increased the contributions of all sources. In other words, variation in source classification substantially alters source apportionment depending on source discrimination and source importance. These results will guide development of procedures for evaluating the appropriate type and number of sediment sources in DRIFTS-PLSR sediment fingerprinting.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Effects of Suspended Sediment Transport on Invertebrate Drift

Cited by 35 publications

References 37 publications

Influence of habitat heterogeneity and bed surface complexity on benthic invertebrate diversity in a gravel‐bed river

Influence of habitat heterogeneity and bed surface complexity on benthic invertebrate diversity in a gravel‐bed river

Efectos de las extracciones de áridos sobre el transporte de sedimentos en suspensión en ríos de montaña (alto río Cinca, Pirineo Central)

Using source‐specific models to test the impact of sediment source classification on sediment fingerprinting

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