Fish habitat assessment model considering the spatial pattern and connectivity of habitat patches

Ecological Indicators, Journal Year: 2024, Volume and Issue: 160, P. 111840 - 111840

Published: March 1, 2024

Although the rational use of water resources through damming rivers can improve economic benefits, it inevitably changes connectivity and hydraulic characteristics reduced river reaches, posing a threat to fish habitats. Habitat assessment provide reference for assessing ecological impact hydropower development effectiveness habitat restoration. However, previous evaluation methods only considered number habitats, which may mislead results. In this article, we proposed novel model based on landscape pattern index method circuit theory, additionally considers spatial patches. This is applied Anshunchang reach Dadu River, target Schizothorax prenanti. We obtained suitable discharge range from 163.0 m3/s 217.4 m3/s. To suitability have also attempted multiple restoration measures. Comparing different measures, was ultimately found that dredging scenario had best improvement effect, with maximum rate 9.87 %. The in article help reservoir managers evaluate habitats formulate plans.

Language: Английский

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Spatio-temporal analysis of rainfall over Chad River Basin, Nigeria

Theoretical and Applied Climatology, Journal Year: 2025, Volume and Issue: 156(2)

Published: Jan. 17, 2025

Language: Английский

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The predicaments of craftsmanship in the knowledge economy: the rise and fall of Caminha’s boatyards in Caminha, Portugal

Cultural Studies, Journal Year: 2025, Volume and Issue: unknown, P. 1 - 23

Published: Feb. 24, 2025

Language: Английский

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Landscape transcriptomic analysis detects thermal stress responses and potential adaptive variation in wild brook trout (Salvelinus fontinalis) during successive heatwaves

The Science of The Total Environment, Journal Year: 2025, Volume and Issue: 969, P. 178960 - 178960

Published: Feb. 28, 2025

Extreme weather events, such as heatwaves, are becoming more frequent and intense a result of climate change. Critically, extreme events can be important drivers extirpation selection than changes in annual or seasonal averages they pose particularly large threat to poikilothermic organisms. In this study, we evaluated the transcriptomic response coldwater adapted fish species, eastern brook trout (Salvelinus fontinalis), two successive heatwaves during July August 2022. We sampled at eight time points from four streams (N = 116 fish), sequenced mRNA gill samples using TagSeq, quantified expression levels 32,670 unique transcripts. Multivariate analyses found that overall patterns water temperature change were similar among streams. These further detected groups genes involved immune oxygen carrier activity upregulated downregulated respectively higher temperatures. also 43 differentially expressed different followed same pattern heatwaves. Of these genes, 42 covaried with most (27, 62.8 %) exhibited responses varied by stream. Some including heat shock proteins cold-inducible RNA binding proteins, have been widely linked experimental studies, whereas other identified functions not well-studied relationship unknown functions. This study shows utility landscape approaches identify biological processes governing wild organismal short-term stressors. The results guide future investigations phenotypic genetic diversity contribute adaptive improve predictions how populations will respond

Language: Английский

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Out of habitat marine mammals – Identification, causes, and management recommendations

Marine Policy, Journal Year: 2025, Volume and Issue: 177, P. 106652 - 106652

Published: March 26, 2025

Language: Английский

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Climate Impacts on Lake Food‐Webs Are Mediated by Biological Invasions

Global Change Biology, Journal Year: 2025, Volume and Issue: 31(3)

Published: March 1, 2025

ABSTRACT Climate change and biological invasions are among the most important drivers of biodiversity ecosystem change. Despite major advances in understanding their ecological impacts, these often considered individually, overlooking possible complex interrelationship. By applying structural equation modeling to an extensive nationwide dataset 430 fish communities across 257 French lakes, we investigated how taxonomic, size, trophic diversities impacted by climate warming exotic species occurrence. Our goal was compare relative signature or lasting impacts after factors had taken effect determine whether mediate current state community diversities. Drawing on a set interconnected hypotheses, suggest that could be indirect warming. This aspect must fully grasp overall effects change, beyond just its direct thermal impacts. results support our hypothesis negatively size However, mostly mediated warming‐induced increase richness, which, turn, promotes total richness. These have substantial role determining impact obscuring diversity patterns predicted temperature alone. We conclude cannot understood without considering via invasions, underscoring need intertwined roles predicting managing consequences.

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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Divergent perspectives on the synergistic impacts of thermal-chemical stress on aquatic biota within the framework of climate change scenarios

Chemosphere, Journal Year: 2024, Volume and Issue: 355, P. 141810 - 141810

Published: March 28, 2024

Language: Английский

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Somatic growth of pikeperch (Stizostedion lucioperca) in relation to variation in temperature and eutrophication in a Central Europe Lake

Fisheries Research, Journal Year: 2023, Volume and Issue: 267, P. 106824 - 106824

Published: Aug. 19, 2023

Global climate change has been altering freshwater ecosystems by impacting many ecological processes, including individual fish growth. Predictions of responses local populations to future environmental can draw inferences from past long-term biochronological data. In this study, we reconstructed growth pattern one the most valuable predatory species in European inland waters, pikeperch (Stizostedion lucioperca), using back-calculated length their otoliths. Samples were collected at Lipno reservoir (Czech Republic) between 2008 and 2020. We used linear mixed-effects models investigate how state conditions affect somatic population. found that rates increased with temperature tended be higher when chlorophyll-a concentration was higher, water transparency lower. This suggests will likely benefit warmer waters predicted scenarios. However, decreasing nutrient loading associated efforts curb eutrophication Central Europe may offset these benefits. Together, results provide a better understanding multiple factors, directly indirectly, influence long term.

Language: Английский

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The initial assessment of an important pelagic fish, Mackerel Scad, in the South China Sea using data‐poor length‐based methods

Marine and Coastal Fisheries, Journal Year: 2023, Volume and Issue: 15(5)

Published: Oct. 1, 2023

Abstract Objective Scads Decapterus spp. occur widely throughout tropical, subtropical, and temperate oceans are both economically ecologically important species. They among the main commercial fish species caught by light falling‐net fishery in South China Sea, which is dominated Mackerel Scad macarellus Shortfin D. macrosoma . Stock assessment an approach used to guide effective management maintain sustainability. Methods Two data‐poor methods, namely length‐based Bayesian biomass estimation spawning potential ratio, were applied assess status of Scad, most dominant Sea. Electronic length–frequency analysis was estimate von Bertalanffy growth parameters (asymptotic length L inf coefficient K ) serve as priors. Result The results show estimated Sea 36.0 cm 0.37/year, respectively. Estimated natural mortality 0.74/year, mean fork at 50% sexual maturity 24.29 cm. Length‐based showed that relative stock size had decreased from 1.3 2012–2014 0.7 2019–2021, indicating overfished status. ratio for this 13% 12%, significantly below limit reference point 20%. Conclusion Our obtained through methods indicate lower SPR due catching excess juveniles. Therefore, we highlight need increase minimum mesh fishing nets strengthen international cooperation conserving shared

Language: Английский

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