Non-perennial segments in river networks

Nature Reviews Earth & Environment, Journal Year: 2023, Volume and Issue: 4(12), P. 815 - 830

Published: Nov. 23, 2023

Language: Английский

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Navigating the drought: upstream migration of a small-sized Cypriniformes (Telestes muticellus) in response to drying in a partially intermittent mountain stream

Knowledge and Management of Aquatic Ecosystems, Journal Year: 2024, Volume and Issue: 425, P. 6 - 6

Published: Jan. 1, 2024

River flow intermittence is a natural phenomenon intensified by human activities, such as water abstraction and the effects of climate change. A growing number rivers are predicted to experience intermittent flows, which may impact diversity abundance freshwater species. Dry riverbeds directly diminish availability habitats for organisms, suitable environments can turn into ecological traps with reduced survival rates, posing significant threat population persistence. Even though fish movements enable drought-affected populations persist, little known about individual movement between perennial reaches. Here, we study PIT-tagged Italian riffle dace ( Telestes muticellus ) in an river reach before, during after two severe drying events. high proportion from survived riverbed through directed upstream migration. This was manifested living displaying significantly higher linear ranges, net travelled distances monitoring period than reach, remained resident limited range travelled. finding underscores importance conserving longitudinal connectivity face increased scarcity patterns.

Language: Английский

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Drivers of Macroinvertebrate Communities in Mediterranean Rivers: A Mesohabitat Approach

Sustainability, Journal Year: 2024, Volume and Issue: 16(7), P. 3075 - 3075

Published: April 7, 2024

We investigated the relationship between benthic macroinvertebrate community attributes (richness, abundance, biodiversity, and climate-specific resistance forms) physical characteristics of distinct mesohabitats (hydromorphological unit types) discretized into fast (e.g., riffles or rapids) slow pools glides) flow types in four Mediterranean rivers Spain. Key hydromorphological units, including length, width, depth, shade, substrate composition, embeddedness, abundance aquatic vegetation, density woody debris, were considered. Through a comprehensive suite multivariate analyses, we unraveled taxonomic habitat distinctions among types, with notable influence spatial proximity (greater similarity within same river basin). In coarse emerged as pivotal factors shaping assemblages, whereas fast-flowing debris most important. Contrary to remaining attributes, studied forms (absent, eggs, cocoons, cells against desiccation diapause) exhibited uniformity across despite observed variations communities, underscoring regional functional analogies biological ecological mechanisms basins. This study contributes valuable insights for anticipating repercussions ongoing climate change, particularly regions where units are more susceptible depletion during drought periods.

Language: Английский

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Freshwater Macroinvertebrate Community Responses to Drying Reflect Abiotic Stress, Frequency of Prior Drying and Proximity to a Perennial Reach

Freshwater Biology, Journal Year: 2025, Volume and Issue: 70(4)

Published: April 1, 2025

ABSTRACT Intermittent streams dominate global river networks and are becoming increasingly common due to change. Understanding the mechanisms by which freshwater biota respond flow recession, drying, intermittence is therefore important our ability support biodiversity as ecosystems adapt ongoing stressors. Responses of communities, including macroinvertebrates, variable likely reflect influence multiple drivers. We aimed investigate how recession changes abiotic conditions (abiotic drying stress), if this affected frequently a site dries over prior two years (frequency drying) or study stream. also untangle stress (hereafter referred frequency distance perennial reach interact macroinvertebrate community richness densities, turnover in taxa between locations with frequent rare drift composition, movement, life histories. Finally, we understand whether fish that visual predators modify behavioural responses, increases development rate at cost body length. measured (channel area, discharge, temperature dissolved oxygen) counted moving macroinvertebrates across five different types. stress, benthic, drifting communities one stream using four sampling campaigns. Each campaign occurred on date, dried location frequencies distances from reach. During each campaign, data were collected sites intensities stress. when channel was its driest, composition histories (body length history stage) collected. Temperatures increased oxygen decreased reduction, regardless Mayfly rates movement increased, but mayflies developed shorter bodies. A predator both associated reduced movement. In intermittent reaches, densities richness, taxonomic turnover. contrast, closer reach, there high relatively little change possibly unaffected Collectively, findings suggest nearest determine effects communities. Therefore, need know reaches predict outcomes intermittency. spatial temporal context front key understanding predicting particularly widespread (and growing) prevalence water resource pressures drought.

Language: Английский

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A bacteria-based index of biotic integrity assesses aquatic ecosystems effectively in rewetted long-term dry river channel after water replenishment

AMBIO, Journal Year: 2024, Volume and Issue: unknown

Published: July 27, 2024

Language: Английский

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Responses of Freshwater Invertebrates to Imhoff Tank Sewage Effluents: A Preliminary Study in Four Watercourses with Different Ecological Status (Abruzzo, Central Italy)

Sustainability, Journal Year: 2024, Volume and Issue: 16(6), P. 2452 - 2452

Published: March 15, 2024

In many EU countries, a large proportion of domestic effluents is treated in small, decentralized wastewater treatment plants (WWTPs) which often lack appropriate technologies. The low efficiency these systems and their incorrect maintenance contribute to environmental deterioration, with quantity inadequately sewage dispersed the soil or discharged into superficial watercourses. Abruzzo region (Central Italy), almost all rivers streams receive from Imhoff tanks only primary treatments. ecological impacts have rarely been investigated. This paper aimed evaluate response freshwater invertebrates receiving watercourses different status. Our results showed that negatively affected structure composition communities, reduction richness abundance more sensitive taxa an increase most tolerant ones. These negative effects were accentuated during flow periods moderate To improve status limit diffusion pathogens micropollutants freshwater, efficient (secondary treatments, possibly nature-based solutions) sustainable (water reuse sludge recycling) approach WWTPs urgently needed.

Language: Английский

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River Runs Dry: Movement Patterns of Telestes muticellus (Cypriniformes: Leuciscidae) in an Intermittent River Stretch

GeoPlanet: earth and planetary sciences, Journal Year: 2024, Volume and Issue: unknown, P. 341 - 351

Published: Jan. 1, 2024

Language: Английский

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A permeable hyporheic zone may contribute to buffer the effects of a drying event on prey availability for salmonid juveniles

Knowledge and Management of Aquatic Ecosystems, Journal Year: 2024, Volume and Issue: 425, P. 15 - 15

Published: Jan. 1, 2024

Climate change is increasing the intensity and frequency of hydrological events in freshwater. Summer droughts drying drastically reduce favourable habitat for aquatic organisms shaping interactions among species. Macroinvertebrates are usually less abundant during severe summer low flows, reducing prey availability carnivorous fish, such as brown trout ( Salmo trutta ). To quantify consequences a surface water event on fish performance, we conducted an experiment 6 experimental channels naturally fed by macroinvertebrates. After colonisation period macroinvertebrates, level was dropped to benthic two weeks 3 channels, while it remained constant other channels. restoration, juvenile were reared three control dry The did not abundance Survival growth unaffected drying. Our provided circumstantial evidence that hyporheic zone could potentially serve effective refuge mitigating effects food webs, although this mitigation would strongly depend sediment characteristics, quality composition macroinvertebrate community.

Language: Английский

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Temporal Changes in Freshwater Invertebrate Communities During the Drying Phase of a Newly Intermittent River in Central Italy

Environments, Journal Year: 2024, Volume and Issue: 11(12), P. 295 - 295

Published: Dec. 20, 2024

The transition from a perennial to an intermittent regime in newly rivers (nIRs) negatively affects both taxonomic and functional diversity, with significant repercussions on freshwater ecosystem processes services. However, better understand how changes the natural flow may influence structure functioning of ecosystems, it is fundamental assess variations abiotic biotic parameters throughout hydrological phases characterizing nIRs. For these reasons, we evaluated temporal community composition during drying phase Central Apennines stream (Italy) over two consecutive drought years. We demonstrated that different pre-drought profoundly affected communities. reduced discharge low-flow conditions 2024 led insect- non-insect-dominated communities, small-sized, lentic-adapted generalist taxa replacing rheophile more sensitive insect taxa. also found marked interannual differences beta diversity. years, richness did not exhibit negative stepped response pattern sequence channel contraction, cessation pools formation. Consequently, can assume Apennine rivers, communities strictly dependent local variable context. This study emphasizes need for further investigation ecological impacts increasing intermittence formerly streams rivers.

Language: Английский

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