Individual movement behaviour and habitat use of a small-sized cypriniform (Telestes muticellus) in a mountain stream

Environmental Biology of Fishes, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 8, 2025

Abstract Knowledge about the biology and ecology of species is fundamental for their management conservation. Despite this, many fish life stages are understudied, there a great need research efforts to understand ecology. Italian riffle dace ( Telestes muticellus ; order Cypriniformes) small-sized (< 15 cm) stream native peninsula. There scarcity on its behaviour. In this study, we explored movement in Mediterranean mountain Northern Italy using passive integrated transponder (PIT) telemetry. Over months, 267 were located 2–27 times. Most remained stationary, while few roamed over several hundreds meters. Fish covered larger linear range during spring autumn than other seasons. T. showed strong preference pools, was strongest summer. We observed no differences habitat use movements between day night, size had major effect. Within displayed remarkably small home ranges (median 8 m 2 ). increased period flood events, indicating that high-flow events may be important downstream upstream dispersal streams.

Language: Английский

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A Jump‐Driven Self‐Exciting Stochastic Fish Migration Model and Its Fisheries Applications

Natural Resource Modeling, Journal Year: 2025, Volume and Issue: 38(1)

Published: Jan. 14, 2025

ABSTRACT We introduce a stochastic continuous‐time model via self‐exciting process with jumps to describe seasonal migration event of diadromous fish exemplified by Ayu Plecoglossus altivelis . The dynamics the stored population at point in river, waiting for their upward migration, increases inflow from downstream/ocean and decreases outflow due upstream migration. is assumed occur constant rate until an Erlang‐distributed termination time. modeled jump incorporate flocking social interactions Harvested cases under barrier‐ threshold‐type strategies are also studied fisheries applications. derive backward Kolmogorov equations associated finite‐difference method compute various performance indices including mean period harvested populations. Detailed numerical sensitivity analysis conducted study spring P.

Language: Английский

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Exploring key drivers of Chinese sturgeon spawning sites fragmentation in the Yangtze River: Insights into spawning window

Ecological Engineering, Journal Year: 2025, Volume and Issue: 213, P. 107563 - 107563

Published: Feb. 16, 2025

Language: Английский

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Widespread and strong impacts of river fragmentation by human barriers on fishes in the Mekong River Basin

Research Square (Research Square), Journal Year: 2025, Volume and Issue: unknown

Published: March 5, 2025

The Mekong River, a global freshwater biodiversity hotspot, has suffered from intensive barrier construction, resulting in major challenges safeguarding its fauna. Here, we provide comprehensive evaluation of the impacts river barriers on distribution 1,032 fish species Basin. Our analysis revealed that 93% suffer habitat fragmentation, and with larger range requirements experienced higher fragmentation impacts. Sub-basins along main channel Lower had high values richness but relatively Across all migration types, potamodromous worst status (Fragmentation Index, 42.56 [95% CI, 36.95–46.05]), followed by catadromous fish. Among IUCN conservation categories, Critically Endangered highest index (33.34 [12.53–46.40]). small dams sluice gates contribute more to than large dams.

Language: Английский

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Evaluating the Potential to Quantify Salmon Habitat via UAS‐Based Particle Image Velocimetry

Water Resources Research, Journal Year: 2025, Volume and Issue: 61(3)

Published: March 1, 2025

Abstract Continuous, high‐resolution data for characterizing freshwater habitat conditions can support successful management of endangered salmonids. Uncrewed aircraft systems (UAS) make acquiring such fine‐scale along river channels more feasible, but workflows quantifying reach‐scale salmon habitats are lacking. We evaluated the potential UAS‐based mapping hydraulic using spectrally based depth retrieval and particle image velocimetry (PIV) by comparing these methods to a well‐established flow modeling approach. Our results indicated that estimates water depth, depth‐averaged velocity, direction derived via remote sensing techniques were comparable in good agreement with field measurements. Predictions spring‐run Chinook ( Oncorhynchus tshawytscha ) juvenile rearing produced from PIV model output similar, small errors relative direct observations. Estimates heterogeneity on kinetic energy gradients generally consistent between modeling, measurements larger. sensitive velocity index used convert surface velocities velocities. Sun glint precluded analysis margins some images large degree overlap frames was thus required obtain continuous coverage reach. Similarly, shadows cast riparian vegetation caused gaps bathymetric maps. Despite limitations, our suggest sites sufficient texture, provide detailed information at reach scale, accuracies traditional multidimensional modeling.

Language: Английский

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A molecular specimen bank for contemporary and future study captures landscape-scale biodiversity baselines before Klamath River dam removal

Research Square (Research Square), Journal Year: 2025, Volume and Issue: unknown

Published: April 3, 2025

Global restoration and conservation of freshwater biodiversity are represented in practice by works such as the Klamath River Renewal Project (KRRP), largest dam removal river United States, which has reconnected 640 kilometers. With removals, many biological outcomes remain understudied due to a lack pre-impact data complex ecosystem recovery timeframes. To avoid this, we created KRRP molecular library, an environmental specimen bank, for long-term curation nucleic acids collected from project. We used these initial samples, DNA metabarcoding, generalized linear mixed-effects models evaluate patterns pre-dam fish richness diversity. Demonstrating suitability resolve differences, baseline shows that tributary mainstem streams had greater native diversity 2.3–10.7 times species than reservoirs. These future sampling efforts should, at minimum, allow tracking community response restoration. Anticipating acceleration omics innovation, preserved samples storage identified requisite phases sustained function adaptation library: securing physical facility genetic material, establishing governance structure, confirming support archive management.

Language: Английский

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Global consequences of dam‐induced river fragmentation on diadromous migrants: a systematic review and meta‐analysis

Biological reviews/Biological reviews of the Cambridge Philosophical Society, Journal Year: 2025, Volume and Issue: unknown

Published: May 7, 2025

ABSTRACT The global proliferation of dams has altered flow and sediment regimes in rivers, presenting a major threat to freshwater biodiversity. Diadromous species, such as fishes, decapod crustaceans gastropods, are particularly susceptible fragmentation because obstruct their breeding migrations between coastal waters rivers. Although have contributed significant declines abundance some commercially important diadromous fishes (salmonids anguillids) Macrobrachium shrimps, understanding the impacts on majority animals is limited. Moreover, number species known life cycles risen substantially during last four decades, from ~250 more than 800. This synthesis aims consolidate highlight potential knowledge gaps. We identified 338 publications documenting decapods, but this was reduced 65 after application our strict selection criteria. Specifically, we only included studies that compared unfragmented (e.g. undammed) or restored with fish passes) fragmented site above dams) To assess statistical significance, results were replicated sufficiently enable calculation standardised effect sizes also subject meta‐analysis focusing three topics: dam‐induced fragmentation; efficacy passes; mitigative dam removal. Study outcomes evaluated five key variables: abundance; richness; assemblage composition; population genetic diversity; structure. found led net negative effects across all variables for fishes. Fishes limited jumping climbing ability obligate migrants cannot persist landlocked populations threatened by fragmentation. However, capable climbers jumpers facultatively nonetheless impacts, gene populations. Installation passes did not lead positive outcomes, whereas removal effective restoring connectivity suggesting it effective, albeit potentially contentious, approach may serve an societal need), habitat connectivity. A smaller investigated decapods (seven versus 61 fishes), findings suggests vulnerable alteration dams, less sensitive barrier they better Gastropods least studied taxon, none met criteria systematic review meta‐analysis. imbalance information about taxa compounded scarcity tropics, South America, Africa, Asia, Southeast East Asia. These regions support diverse aquatic assemblages so be underestimated given existing conservation would best served avoiding construction while improving mitigation strategies, passage design, limit most damaging river

Language: Английский

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A homology guide for Pacific salmon genus Oncorhynchus resolves patterns of ohnolog retention, resolution and local adaptation following the salmonid‐specific whole‐genome duplication event

Ecology and Evolution, Journal Year: 2023, Volume and Issue: 13(4)

Published: April 1, 2023

Abstract Salmonid fishes have emerged as a tractable model to study whole‐genome duplications (WGDs) this group has undergone four rounds of WGDs. While most the salmonid genome returned diploid state, significant proportion genes are maintained duplicates and referred ohnologs. The fact that much modern gene repertoire is comprised ohnologs, while other their singleton state creates complications for genetic studies by obscuring homology relationships. difficulty particularly prominent in Pacific salmonids belonging genus Oncorhynchus who focus intense genetics‐based conservation management efforts owing important ecological cultural roles these fish play. To address gap, we generated guide six species with available genomes used describe patterns ohnolog retention resolution. Overall, find ohnologs comprise approximately half each repertoires, which functionally enriched involved DNA binding, less numerous heavily dosage‐sensitive processes such mitochondrial metabolism. Additionally, reanalyzing published expression data from locally adapted strains O. mykiss , show exhibit adaptive profiles; however, not more likely display signatures than either paralogs or singletons. Finally, demonstrate utility our investigating evolutionary relationship among highlighted playing role life‐history traits editing targets.

Language: Английский

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Dams facilitate predation during Atlantic salmon (Salmo salar) smolt migration

Canadian Journal of Fisheries and Aquatic Sciences, Journal Year: 2023, Volume and Issue: 81(1), P. 38 - 51

Published: Nov. 14, 2023

Diadromous fish populations have incurred precipitous declines across the globe. Among many stressors, these species are threatened by anthropogenic barriers that impede movement, alter riverine habitat, and augment predator communities. In this study, we used acoustic transmitters ( n = 220) with predation temperature sensors to characterize Atlantic salmon Salmo salar) smolt risk in Penobscot River, Maine, USA. Across two seasons, documented 79 events through a 170 km migratory pathway, which included three hydropower projects large estuary. We detected tagged smolts were predated 42), marine mammals 28), birds 9). Using multistate mark-recapture framework, estimated 46% of during downstream migration, accounted for at least 55% all mortality. Relative was greatest impoundments lower estuary, where on average, rates 4.8-fold 9.0-fold greater than free-flowing reaches, respectively. These results suggest pressure is exacerbated estuary may be expected.

Language: Английский

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Glass eels at the continental edge of Europe: revisiting catchment recruitment at the international River Minho/Miño

Hydrobiologia, Journal Year: 2024, Volume and Issue: 851(11), P. 2591 - 2607

Published: Jan. 29, 2024

Abstract The glass eel catch from the international River Minho, western Iberian Peninsula, forms southernmost Atlantic series in composite index outside North Sea assessing European recruitment. Here, new experimental yield data lower estuary (1981–2022) and fishers´ daily records (1990–2022) were modelled to describe compare seasonal interannual trends. Seasonality matched river discharge climatology, possibly a more general feature southern range of species distribution, with difference between high low season becoming less marked recent periods abundance. Glass showed sharp decline during 1980s, line recruitment total Minho catch, but not local estimates per unit effort. This is corroborated by trends records, suggesting that reduction effort was consequence gradual adjustment catchment mediated progressively tighter management measures. inefficiency fisheries regulatory measures guarantee stock recovery alone calls for comprehensive reverse anthropogenic impacts on continental populations, task seems Herculean.

Language: Английский

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