Environmental DNA Biomonitoring Reveals the Interactive Effects of Dams and Nutrient Enrichment on Aquatic Multitrophic Communities

Environmental Science & Technology, Journal Year: 2022, Volume and Issue: 56(23), P. 16952 - 16963

Published: Nov. 16, 2022

Dam construction and nutrient enrichment are two pervasive stressors in rivers worldwide, which trigger a sharp decline biodiversity ecosystem services. However, the interactive effects of both on multitrophic taxonomic groups remain largely unclear. Here, we used datasets captured by environmental DNA (eDNA) approach to reveal interactions between dams aquatic communities from aspects α diversity, β food webs. First, our data showed that jointly shaped unique spatial pattern across four river systems, dissimilarity community structure significantly declined (i.e., structural homogenization) under stressors. Second, nutrients together explained 40–50% variations communities, had stronger impact fish, insects, bacteria, yet power drive protozoa, fungi, eukaryotic algae. Finally, found additive, synergistic, antagonistic were common coexisted systems led simplified webs, with decreases modularity (synergistic) robustness (additive) an increase coherence (synergistic). Overall, study highlights eDNA-based can provide perspectives for fostering understanding multiple rivers.

Language: Английский

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The connectivity threshold of the wetlands based on water environment response, and a case study of China’s Baiyangdian wetland

Journal of Hydrology, Journal Year: 2024, Volume and Issue: 630, P. 130687 - 130687

Published: Jan. 23, 2024

Language: Английский

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Stream fish metacommunity organisation across a Neotropical ecoregion: The role of environment, anthropogenic impact and dispersal-based processes

PLoS ONE, Journal Year: 2020, Volume and Issue: 15(5), P. e0233733 - e0233733

Published: May 26, 2020

Understanding how assemblages are structured in space and the factors promoting their distributions is one of main goals Ecology, however, studies regarding distribution organisms at larger scales remain biased towards terrestrial groups. We attempt to understand if structure stream fish metacommunities across a Neotropical ecoregion (Upper Paraná—drainage area 820,000 km2) affected by environmental variables, describing natural gradient, anthropogenic impacts spatial predictors. For this, we obtained 586 sampling points data on predictors that potentially affect assemblages. calculated local beta diversity (Local Contribution Beta Diversity, LCBD) alpha from species list, be used as response variables partial regression models, while impacts, gradient were found high total for (0.41) where greatest values each site sampled located edges ecoregion, richer communities more centrally. All sets explained LCBD diversity, but most important was dispersal followed impact. However, an increase models' prediction power through shared effect. Results suggest filters (i.e. such climate, hydrology impact) limitation together shape Upper Paraná showing importance using multiple processes structuring biodiversity distribution.

Language: Английский

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Environmental DNA metabarcoding revealed the impacts of anthropogenic activities on phytoplankton diversity in Dianchi Lake and its three inflow rivers

Ecology and Evolution, Journal Year: 2023, Volume and Issue: 13(5)

Published: May 1, 2023

Abstract Phytoplankton diversity is closely related to environmental variables and has been widely used in ecological health assessment of rivers lakes. Combining advantages DNA‐based identification high‐throughput sequencing technology, DNA (eDNA) metabarcoding permits a new measurement for biodiversity monitoring aquatic ecosystems. However, it had rarely explore the variability similarity phytoplankton between lake its inflow effects on phytoplankton. This study utilized eDNA investigate spatial distribution impacts Dianchi Lake (one most polluted urban lakes China) main (Panlong River, Baoxiang Chai River). A total 243 distinct taxa were detected, covering 9 phyla, 30 classes, 84 orders, 132 families, taxonomic richness was higher than that Lake. Distinct patterns (e.g., community structure, dominant taxon, ɑ‐diversity) exhibited among three rivers, but similar also observed estuarine sites. The variables, which associated with pollution sources from different anthropogenic activities urbanization, water diversion, industrial agricultural activities). primary correlated varied habitats. phosphorus (TP) chemical oxygen demand (COD) positively structures Lake, whereas negatively Panlong River River. nitrogen (TN) Overall, this provides insights conservation healthy management

Language: Английский

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Impacts of the Middle Route of China’s South-to-North Water Diversion Project on the water network structure in the receiving basin

Environmental Science and Pollution Research, Journal Year: 2024, Volume and Issue: 31(10), P. 15611 - 15626

Published: Feb. 1, 2024

Language: Английский

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River continuum disruptions in a highly altered system: The perspective of potamodromous fish

Ecological Indicators, Journal Year: 2024, Volume and Issue: 164, P. 112130 - 112130

Published: May 22, 2024

In this study, we explored how barriers such as dams have affected the longitudinal connectivity of riverine habitats from perspective potamodromous fish. For purpose, changes are investigated in central part Austrian Danube system, where national reporting for EU Water Framework Directive provides detailed information on position and characteristics well distribution range native fish species. This assessment is based an estimation regarding quantitative upstream downstream passability individual barriers, further investigate three different scenarios to account uncertainties. We then apply several combinations assumptions dispersal distances calculate a series network-based reach catchment indices. On average, barrier indicated high passability, while was substantially lower across scenarios. Furthermore, existing passes were estimated increased average between 20 % 24 %. Overall, results strong effect river network. Catchment scale indices revealed loss connectivity, which with distance. Reach displayed disruption natural gradient along network that reaches have, become more isolated addition overall decrease connectivity. The at 72 (SD = 16 %) when taking into all connections other 66 7 only considered. conclude system still severely compromised, making it increasingly challenging species complete their life cycle. issue amplified by severe consequence engineering.

Language: Английский

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Assembling the Pecos River fish fauna: barrier displacement on the Southern Great Plains, North America

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

Published: March 20, 2025

Barrier displacement by river capture is an important mechanism for the assembly of freshwater fish faunas. The production increasingly comprehensive and rigorously dated phylogentic trees major clades fishes, along with improved resolution in historical geomorphology, provide unprecedented opportunity to develop thorough biogeographical scenarios faunal that synthesise existing knowledge detailed context future study. Pecos River southwestern North America a textbook example drainage formation provides straightforward case capture. Fishes ultimately confined middle section (Capitan area endemism) have their closest relatives Brazos, Colorado (Texas), Red rivers, which served as ancient dispersal corridors from Mississippi drainage. Capitan endemism developed association two dissolution basins that, Late Miocene, captured headwaters these rivers. In Pliocene or Early Pleistocene, endorheic was overflowed into tributary Río Grande, became lower River. nascent also harboured endemic-fish assemblage part nexus springfed rivers (ancestral Devils River, River) comprised endemism. Even after through-flowing linked areas endemism, many endemic species remained only within original giving composite fauna. Grande connection later allowed fishes dispersing Gulf Mexico coast, aided Pleistocene sea-level falls glacial outbursts, not populate but disperse up Incision valley uplift Sangre de Cristo Mountains empowered headwater streams adjacent South Canadian bringing additional fishes. More recently, humans introduced at least 50 drainage, while human impacts fragmented native Non-native versus status remains uncertain several (e.g. Miniellus stramineus) multiple lineages diverse origin may exist some widespread, polytypic like Cyprinella lutrensis Pimephales promelas. fauna anomaly explainable complex geomorphological history produced it. As such, it unique studies fish-assemblage evolutionary ecology. Also, its neighbouring drainages helps clarify biogeography (as here). Further broadening this synthesis could support large spatial scales, illustrating potential now exists reconstructing regional river-drainage

Language: Английский

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A lightweight network based on SCMYOLO for accurate and efficient underwater fish detection

ICES Journal of Marine Science, Journal Year: 2025, Volume and Issue: 82(4)

Published: April 1, 2025

Abstract The accurate and rapid identification of fish in natural underwater settings is crucial for the intelligent monitoring fisheries. However, computational requirements intricate models necessitate advanced hardware capabilities, limiting deployment within systems. To address this, we introduce a lightweight object detection model named SCMYOLO. This employs several innovations to reduce complexity enhance performance. Firstly, replace yolov5 backbone network with MobileNetV3, significantly reducing parameters load as measured by floating-point operations. Secondly, integrate high-level screening-feature fusion pyramid structure Neck layer combine C3 module context guided (CGNetwork) module. approach improves extraction low-level features addresses challenges associated multi-scale detection, thereby enabling feature fusion. Lastly, incorporate SIoU loss function refine accuracy bounding box predictions. Our experimental findings demonstrate that SCMYOLO achieves an 88.4% reduction 86.2% decrease operations, size file constituting just 14.6% original. Furthermore, sustains high-performance metrics precision, recall, [email protected] all exceeding 90%, indicating robust capabilities. Given these attributes, particularly suited on various edge computing devices, offering efficient solution complex environments. Source code available at https://github.com/systemavailable/SCMYOLO.

Language: Английский

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Impacts of dams on fish habitat connectivity greatly outweigh climate change in the Jinsha river basin, China

Journal of Hydrology, Journal Year: 2025, Volume and Issue: unknown, P. 133411 - 133411

Published: May 1, 2025

Language: Английский

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Barrier features, fish traits, and river flows drive fragmentation of freshwater fish

Ecological Monographs, Journal Year: 2025, Volume and Issue: 95(2)

Published: May 1, 2025

Abstract Instream structures such as dams and weirs create artificial barriers to the passage of riverine fish, fragmenting their communities contributing global declines in freshwater fish biodiversity. Preventing further requires remediation restore passage, but analysis fragmented is necessary prioritize locations taxa for remediation. Additionally, potential high flow events facilitate barrier drown‐out reduce fragmentation remains unresolved. We used a meta‐regression investigate severity relation features, traits, river flows, quantifying with novel log response ratio metric reflecting asymmetry populations around barriers. discovered that barriers, which separate different sized habitats, clusters sequential cause more severe should be prioritized Currently, focused on improving mobile fishes, migrate short distances have poor swimming performance were most fragmented, suggesting efforts are warranted improve less vagile fishes. found evidence was reduced by large flows spill onto floodplain provide additional connectivity particularly highly regulated sections stream many The findings this study can applied management rivers, an area increasing relevance worsening discontinuity rivers due climate change continued construction

Language: Английский

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