Monthly sampling reveals seasonal fine sediment fluctuations and riverine invertebrate community responses

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 911, P. 168750 - 168750

Published: Nov. 21, 2023

Managing the impacts of anthropogenically enhanced deposited fine sediment levels in lotic ecosystems requires understanding how catchment land-use changes have altered natural regime (erosion, transport, deposition) rivers. Unfortunately, no existing studies employed an appropriate sampling frequency over a period encompassing full range seasonal flow conditions expected to influence in-stream dynamics. We determined short-term (monthly) dynamics and invertebrate communities 12-months 15 fourth- fifth-order rivers draining catchments low, medium high intensity Southland, New Zealand determine when where threatens stream health. compared Quorer resuspension method (suspendable inorganic sediment, SIS) visual cover assessment method, evaluated effectiveness four commonly-used health metrics against their newly developed sediment-specific counterparts. Monthly variability SIS was substantial across all categories, but became more pronounced as increased. All sites experienced prolonged relatively stable which coincided with largest increase at 14 sites. However, not mirrored macroinvertebrate metrics. These findings suggest that controlling inputs streams will be most effective targeted periods flow, particularly within catchments. The consistently outperformed estimates considering its relationship metrics, while demonstrated stronger association than commonly e.g. (%EPT). conclude restoration/mitigation practices cannot based solely on short-term, or even long-term, reductions physical measures alone, should long-term recoveries sediment-impacted using concurrent measurements both biotic abiotic conditions.

Language: Английский

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Context specific effects of substrate composition on the taxonomic and functional diversity of macroinvertebrate communities in temperate lowland streams

Ecology and Evolution, Journal Year: 2024, Volume and Issue: 14(8)

Published: Aug. 1, 2024

Substrate composition has been widely recognised as a primary variable shaping lotic macroinvertebrate communities at the habitat unit level. However, fundamental understanding of how inhabiting mineralogical habitats (i.e., gravel, sand and silt) are structured across differing rivers is lacking. Moreover, research largely focusses on gravel beds fine sediment in general (<2 mm) result detailed field observations specifically silt fractions Using data from five UK streams collated published studies, we assess taxonomic functional biodiversity (alpha beta diversity) level (as defined by substrate sand, gravel). We found that were clearly different all units for each individual stream (and landscape scale), with comparable, but less strong, distinctions between substrates community composition. alpha diversity metrics Local Contribution to Beta Diversity (LCBD) recorded among varied significantly rivers, amount variation explained demonstrated considerable differences suggesting strong context dependence. The depositional support discrete levels within rivers. advocate care should be taken when seeking generalise patterns scale our study highlights high degree dependency considering role template. results provide evidence discriminating size (sand or important fully elucidate wider ecological importance these distinct they support.

Language: Английский

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Long-term recovery dynamics determined by the degree of the disturbance – Ten years tracking of aquatic macroinvertebrate recolonisation after an industrial disaster (Red Sludge Disaster, Hungary)

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 921, P. 171071 - 171071

Published: Feb. 18, 2024

A ten-year-long examination of macroinvertebrate community recovery was conducted following a catastrophic spill highly alkaline red sludge (pH >13) into lowland streams. Our primary objective to compare patterns after coarse and fine-grain disturbances, focusing on two aspects: i) trend analysis reveal mean changes six parameters, ii) variation analyses assess parameter over time. We statistical long-term data series macroinvertebrates obtained from quantitative samples collected at four sections with varying degrees disturbance along the impacted stream sections. developed comprehensive theoretical framework comprising sequential phases: Ramp-up, Overshoot, Oscillation Phases. revealed that disturbances show gradual pattern, while variance showed an asymptotic convergence equilibrium. Evaluating these trends across phases unveiled initial phase exhibited steep trajectory, lasting 4–9 months, irrespective severity. Coarse-grain induced remarkable Overshoot phenomenon all metrics. The more severe disturbance, greater height duration Overshoot. results suggest presence or absence can serve as indicator for coarse-grain in context large infrequent (LID). entire process lasts 2.5–3 years severity LID. In conclusion, minimum survey half is deemed imperative capture recovery, associated LID are not expected extend beyond three-year threshold. framework, including may assist future studies comparing different types. Furthermore, our likely be applicable other groups organisms given sufficiently long monitoring influenced also by length reproductive cycles.

Language: Английский

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Fine sediments produce tipping points in the taxonomic and functional structure of benthic macroinvertebrates in neotropical streams

Aquatic Sciences, Journal Year: 2024, Volume and Issue: 87(1)

Published: Nov. 29, 2024

Language: Английский

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Short-term response of benthic foraminifera to fine-sediment depositional events simulated in microcosm

Biogeosciences, Journal Year: 2023, Volume and Issue: 20(15), P. 3329 - 3351

Published: Aug. 11, 2023

Abstract. A microcosm experiment was designed to describe how benthic foraminifera react fine-sediment deposits varying in frequency and intensity as they may occur regularly or occasionally coastal environments, caused by discharges from (e.g.) river flooding, tidewater glacier melting polar regions, diverse anthropic activities linked harbour watershed management. The influence of seabed burial resulting these events on the ecology ecosystems is often overlooked, resilience communities poorly known. During a 51 d long experiment, typical northeastern Atlantic intertidal foraminiferal community, mainly represented Ammonia confertitesta Haynesina germanica species, subjected two kinds sedimentary disturbance: (1) one-time high-volume (OHV) deposit, i.e. sediment about 3 cm thick added at one time beginning experiment; (2) frequent low-volume (FLV) deposits, 0.5 each week for 4 weeks. geochemical environment (e.g. dissolved oxygen penetration sediment, salinity, temperature, nutrient content supernatant water) monitored follow steady state before during experiment. In both disturbed microcosms, H. showed significant linear decrease abundance while total significantly affected only OHV treatment, suggesting stronger effect single deposit standing stocks biodiversity compared supplies. Concerning vertical migration after disturbances, dominant species moved upwards water–sediment interface with speeds estimated be 0.41 0.47 mm h−1 respectively A. germanica. FLV resilient already reached within 1 following low-thickness burial, OHV, it achieved between 7 deposit. These results suggest that can migrate rapidly recover their preferential life position under new sediment–water interface, but case an abrupt several days are needed reach state.

Language: Английский

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Basin‐scale variables drive macroinvertebrate biomass in low‐order streams across different mountain ecoregions

Journal of Biogeography, Journal Year: 2023, Volume and Issue: 50(12), P. 2030 - 2041

Published: Aug. 31, 2023

Abstract Aim Biomass is an important descriptor of macroinvertebrate communities, providing insights into stream productivity and ecosystem functioning. Nevertheless, the drivers biomass are still poorly assessed, especially in multiscale studies. Here, we aimed at filling this gap by assessing relationship between environmental variables measured patch, reach basin scale biomass, as well transferability such relationships across different mountain regions. Location Maritime‐Cottian Alps Tuscan‐Emilian Apennine (Northern Italy). Taxa Freshwater macroinvertebrates. Methods Patch‐, reach‐ basin‐scale variables, either field or computed with kriging techniques, were summarised sparse principal component axes later used mixed modelling variance partitioning to assess relative effect on biomass. An independent model was run for each region, results compared drivers. Results Basin‐scale explained most variability both regions, supporting results. More specifically, mean cumulated daily precipitation main driver Patch‐ reach‐scale also significantly affected but their role varied depending region considered, without any clear pattern. Main Conclusions Overall, highlighted a dominance drivers—and specifically precipitation—and consistency This implies that climatic regulate energy fluxes higher trophic levels subsidies downstream river sections terrestrial ecosystems. These findings offer ecosystem‐level vulnerability climate change.

Language: Английский

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Relationship between sediment grain sizes and macroinvertebrate distribution along the Isiukhu River, western Kenya

African Journal of Aquatic Science, Journal Year: 2023, Volume and Issue: 48(3), P. 274 - 286

Published: July 3, 2023

The current study investigated the relationship between sediment grain sizes and macroinvertebrate distribution along Isiukhu River, a tropical stream in western Kenya. Ten sites total were selected from upstream, midstream downstream areas. Sampling of sediments macroinvertebrates was carried out twice month March 2018 to 2019. Sediment characterised as polymodal extremely poorly sorted at upstream; trimodal midstream; towards river. Upstream fine gravelly mud very coarse mud, while muddy sand gravelly, clayey sand, indicating became finer downstream. identified 993 individual 21 families. Highest mean abundance (100 ± 9.2) recorded Kimangeti (upstream) least Mutono (11 0.7) (downstream). A regression model size indicated that accounted for 28.7% spatial variability abundance. connection diversity River highlights control soil erosion this catchment is important ecology

Language: Английский

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Two-year assessment of the effects of controlled sediment flushing on stream habitats and biota at reach scale

Scientific Reports, Journal Year: 2024, Volume and Issue: 14(1)

Published: Sept. 9, 2024

Language: Английский

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Monthly Sampling Reveals Seasonal Fine Sediment Fluctuations and Riverine Invertebrate Community Responses

Published: Jan. 1, 2023

Managing the impacts of anthropogenically enhanced deposited fine sediment levels in lotic ecosystems requires understanding how catchment land-use changes have altered natural regime (erosion, transport, deposition) rivers. Unfortunately, no existing studies employed an appropriate sampling frequency over a period encompassing full range seasonal flow conditions expected to influence in-stream dynamics. We determined short-term (monthly) dynamics and invertebrate communities 12-months 15 fourth- fifth-order rivers draining catchments low, medium high intensity Southland, New Zealand determine when where threatens stream health. Additionally, we evaluated effectiveness four commonly-used health metrics against their newly developed sediment-specific counterparts, compared Quorer resuspension method (suspendible inorganic sediment, SIS) visual cover assessment method. Monthly variability SIS was substantial across all categories, but became more pronounced as increased. However, not mirrored macroinvertebrate metrics. All sites experienced prolonged relatively stable which coincided with largest increase at 14 sites. These findings suggest that controlling inputs streams will be most effective targeted periods flow, particularly within catchments. The consistently outperformed estimates considering its relationship metrics, whilst demonstrated stronger association then commonly e.g. (%EPT). conclude restoration/mitigation practices cannot based solely on short-term, or even long-term, reductions physical measures alone, should long-term recoveries sediment-impacted using concurrent measurements both biotic abiotic conditions.

Language: Английский

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Long-Term Recovery Dynamics Determined by the Degree of the Disturbance – Ten Years Tracking of Aquatic Macroinvertebrate Recolonization after an Industrial Disaster (Red Sludge Disaster, Hungary)

Published: Jan. 1, 2023

A ten-year-long examination of macroinvertebrate assemblage recovery was conducted following a catastrophic spill highly alkaline red sludge (pH >13) into lowland streams. Our primary objective to compare patterns after coarse and fine-grain disturbances, focusing on two aspects: i) trend analysis reveal mean changes community parameters, ii) variation analyses assess parameter over time. We statistical long-term data series macroinvertebrates obtained from quantitative samples collected at four sections with varying degrees disturbance along the impacted stream sections.We developed comprehensive theoretical framework comprising sequential phases: Ramp-up, Overshoot, Oscillation Phases.i) revealed that disturbances show gradual pattern, while variance showed an asymptotic convergence equilibrium.ii) Evaluating these trends across phases unveiled initial phase exhibited steep trajectory, lasting 4-9 months, irrespective severity. Coarse-grain induced remarkable Overshoot phenomenon all metrics. The more severe disturbance, greater height duration Overshoot. results suggest presence or absence can serve as indicator for coarse-grain in context large infrequent (LID). entire process lasts 2.5-3 years severity LID.In conclusion, minimum survey half is deemed imperative capture recovery, associated LID are not expected extend beyond three-year threshold. framework, including may assist future studies comparing different types. Furthermore, our likely be applicable other groups organisms given sufficiently long monitoring influenced also by length reproductive cycles.

Language: Английский

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