Spatial-seasonal dynamics of fish in a drought-stressed Mediterranean reservoir: An integrated hydroacoustic approach for adaptive management

Non-invasive fish monitoring is essential in Mediterranean reservoirs where drought and drawdown demand rapid, whole water-column assessments. We combined hydroacoustics and standardized netting to quantify spatial and seasonal variation in fish density and biomass, size structure, and species compo...

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Detalles Bibliográficos
Autores: Encina Encina, Lourdes, Orduna, Carlos, Rodríguez Ruiz, Amadora, Granado Lorencio, Carlos Antonio, Cid Quintero, Juan Ramón, Meo, Ilaria de
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2026
País:España
Institución:Universidad de Sevilla (US)
Repositorio:idUS. Depósito de Investigación de la Universidad de Sevilla
OAI Identifier:oai:dnet:idus________::c6e1073c6a47ac4099f376b893906529
Acceso en línea:https://hdl.handle.net/11441/186098
https://doi.org/10.1016/j.ecoleng.2026.107948
Access Level:acceso abierto
Palabra clave:Adaptive management
Alburnus alburnus
Drought
Hydroacoustics
Mediterranean reservoirs
Monitoring
Nets
Zahara-El Gastor Reservoir
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spelling Spatial-seasonal dynamics of fish in a drought-stressed Mediterranean reservoir: An integrated hydroacoustic approach for adaptive managementEncina Encina, LourdesOrduna, CarlosRodríguez Ruiz, AmadoraGranado Lorencio, Carlos AntonioCid Quintero, Juan RamónMeo, Ilaria deAdaptive managementAlburnus alburnusDroughtHydroacousticsMediterranean reservoirsMonitoringNetsZahara-El Gastor ReservoirNon-invasive fish monitoring is essential in Mediterranean reservoirs where drought and drawdown demand rapid, whole water-column assessments. We combined hydroacoustics and standardized netting to quantify spatial and seasonal variation in fish density and biomass, size structure, and species composition in Zahara-El Gastor Reservoir (SW Spain) and to evaluate an integrated monitoring approach. We conducted four seasonal surveys combining split-beam horizontal (0–4 m) and vertical echosounding with CEN standard multi-mesh gillnets and trammel nets across dam, central, and riverine zones of the reservoir. Acoustic data, analysed at 300 m Elementary Sampling Distance Units (ESDUs), revealed strong spatial and seasonal patterns: approximately 70% of acoustic detections occurred in the upper 4 m, where fish density peaked in summer at 122 ± 179 ind⋅10- 3 m- 3, with consistently higher values near the surface. Catches were numerically dominated by invasive bleak Alburnus alburnus (≈96.6% of individuals), while Andalusian barbel Luciobarbus sclateri accounted for ≈40% of biomass. Overall density was about five times higher than early post-impoundment surveys, consistent with bleak proliferation and reduced storage volume during drought. Size-class distributions showed no coherent seasonal shifts, indicating a lack of clear seasonal changes in community structure. Integrating horizontal and vertical hydroacoustics with minimal netting enables rapid, fish-friendly, and cost-effective monitoring under climate-driven water-level fluctuations, providing a practical basis for adaptive reservoir monitoring. ElsevierBiología Vegetal y Ecología2026info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfapplication/pdfhttps://hdl.handle.net/11441/186098https://doi.org/10.1016/j.ecoleng.2026.107948reponame:idUS. Depósito de Investigación de la Universidad de Sevillainstname:Universidad de Sevilla (US)InglésEcological Engineering, 227, 107948. info:eu-repo/semantics/openAccessoai:dnet:idus________::c6e1073c6a47ac4099f376b8939065292026-06-17T12:51:07Z
dc.title.none.fl_str_mv Spatial-seasonal dynamics of fish in a drought-stressed Mediterranean reservoir: An integrated hydroacoustic approach for adaptive management
title Spatial-seasonal dynamics of fish in a drought-stressed Mediterranean reservoir: An integrated hydroacoustic approach for adaptive management
spellingShingle Spatial-seasonal dynamics of fish in a drought-stressed Mediterranean reservoir: An integrated hydroacoustic approach for adaptive management
Encina Encina, Lourdes
Adaptive management
Alburnus alburnus
Drought
Hydroacoustics
Mediterranean reservoirs
Monitoring
Nets
Zahara-El Gastor Reservoir
title_short Spatial-seasonal dynamics of fish in a drought-stressed Mediterranean reservoir: An integrated hydroacoustic approach for adaptive management
title_full Spatial-seasonal dynamics of fish in a drought-stressed Mediterranean reservoir: An integrated hydroacoustic approach for adaptive management
title_fullStr Spatial-seasonal dynamics of fish in a drought-stressed Mediterranean reservoir: An integrated hydroacoustic approach for adaptive management
title_full_unstemmed Spatial-seasonal dynamics of fish in a drought-stressed Mediterranean reservoir: An integrated hydroacoustic approach for adaptive management
title_sort Spatial-seasonal dynamics of fish in a drought-stressed Mediterranean reservoir: An integrated hydroacoustic approach for adaptive management
dc.creator.none.fl_str_mv Encina Encina, Lourdes
Orduna, Carlos
Rodríguez Ruiz, Amadora
Granado Lorencio, Carlos Antonio
Cid Quintero, Juan Ramón
Meo, Ilaria de
author Encina Encina, Lourdes
author_facet Encina Encina, Lourdes
Orduna, Carlos
Rodríguez Ruiz, Amadora
Granado Lorencio, Carlos Antonio
Cid Quintero, Juan Ramón
Meo, Ilaria de
author_role author
author2 Orduna, Carlos
Rodríguez Ruiz, Amadora
Granado Lorencio, Carlos Antonio
Cid Quintero, Juan Ramón
Meo, Ilaria de
author2_role author
author
author
author
author
dc.contributor.none.fl_str_mv Biología Vegetal y Ecología
dc.subject.none.fl_str_mv Adaptive management
Alburnus alburnus
Drought
Hydroacoustics
Mediterranean reservoirs
Monitoring
Nets
Zahara-El Gastor Reservoir
topic Adaptive management
Alburnus alburnus
Drought
Hydroacoustics
Mediterranean reservoirs
Monitoring
Nets
Zahara-El Gastor Reservoir
description Non-invasive fish monitoring is essential in Mediterranean reservoirs where drought and drawdown demand rapid, whole water-column assessments. We combined hydroacoustics and standardized netting to quantify spatial and seasonal variation in fish density and biomass, size structure, and species composition in Zahara-El Gastor Reservoir (SW Spain) and to evaluate an integrated monitoring approach. We conducted four seasonal surveys combining split-beam horizontal (0–4 m) and vertical echosounding with CEN standard multi-mesh gillnets and trammel nets across dam, central, and riverine zones of the reservoir. Acoustic data, analysed at 300 m Elementary Sampling Distance Units (ESDUs), revealed strong spatial and seasonal patterns: approximately 70% of acoustic detections occurred in the upper 4 m, where fish density peaked in summer at 122 ± 179 ind⋅10- 3 m- 3, with consistently higher values near the surface. Catches were numerically dominated by invasive bleak Alburnus alburnus (≈96.6% of individuals), while Andalusian barbel Luciobarbus sclateri accounted for ≈40% of biomass. Overall density was about five times higher than early post-impoundment surveys, consistent with bleak proliferation and reduced storage volume during drought. Size-class distributions showed no coherent seasonal shifts, indicating a lack of clear seasonal changes in community structure. Integrating horizontal and vertical hydroacoustics with minimal netting enables rapid, fish-friendly, and cost-effective monitoring under climate-driven water-level fluctuations, providing a practical basis for adaptive reservoir monitoring.
publishDate 2026
dc.date.none.fl_str_mv 2026
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/11441/186098
https://doi.org/10.1016/j.ecoleng.2026.107948
url https://hdl.handle.net/11441/186098
https://doi.org/10.1016/j.ecoleng.2026.107948
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Ecological Engineering, 227, 107948.
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:idUS. Depósito de Investigación de la Universidad de Sevilla
instname:Universidad de Sevilla (US)
instname_str Universidad de Sevilla (US)
reponame_str idUS. Depósito de Investigación de la Universidad de Sevilla
collection idUS. Depósito de Investigación de la Universidad de Sevilla
repository.name.fl_str_mv
repository.mail.fl_str_mv
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