Diego García de Jalón

Universidad Politécnica de Madrid

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Carlos Alonso

Universidad Politécnica de Madrid

Marta González del Tánago

Universidad Politécnica de Madrid

Vanesa Martínez‐Fernández

Universidad Politécnica de Madrid

Joaquín Solana Gutiérrez

Universidad Politécnica de Madrid

José María Santiago

Universidad Autónoma de Madrid

Miguel Marchamalo

Universidad Politécnica de Madrid

Javier Gortázar

Universidad Politécnica de Madrid

José M. Santiago

Universidad Politécnica de Madrid

Khosro Fazelpoor

Universidad Politécnica de Madrid

Marta Gonzalez del Tanago del Rio

Cooperative Institutions

Universidad Politécnica de Madrid

Shiraz University

Soil Conservation and Watershed Management Research

BOKU University

UK Centre for Ecology & Hydrology

Agricultural Research & Education Organization

Gorgan University of Agricultural Sciences and Natural Resources

Universidad Complutense de Madrid

Consejo Superior de Investigaciones Científicas

Centre National de la Recherche Scientifique

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Indicators of river system hydromorphological character and dynamics: understanding current conditions and guiding sustainable river management

Aquatic Sciences (2015)

Marta González del Tánago Angela M. Gurnell Barbara Belletti Diego García de Jalón

River management

10.1007/s00027-015-0429-0

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Citations (53)

Peces ibéricos de agua dulce

Diego García de Jalón Francisco Hervella Gregorio Prieto Rosado

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Macroinvertebrate assemblages downstream of dams show no sign of impairment despite flow regulation and thermal alteration

Ecohydrology & Hydrobiology (2023)

Vanesa Martínez‐Fernández Diego García de Jalón

Ecoregion

River ecosystem

Biota

Flow conditions

10.1016/j.ecohyd.2023.04.011

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Responses of riparian guilds to flow alterations in a Mediterranean stream

Journal of Vegetation Science (2011)

María Dolores Bejarano Marta González del Tánago Diego García de Jalón Miguel Marchamalo Álvaro Sordo‐Ward

Abstract Questions Do M editerranean riparian guilds show distinct responses to stream water declines? If observed, which are the most sensitive and resilient guilds and their most affected attributes? Location T iétar river below the R osarito dam, central‐western S pain. Methods We identified riparian guilds based on key woody species features and species distribution within this M editerranean river corridor, and evaluated similarity of their responses to long‐term flow alteration (i.e. stream water declines since dam construction in 1959). Hierarchical cluster analysis was used to group surveyed vegetation bands according to species composition. The groups were designated as riparian guilds where each vegetation group comprising a guild: (1) contains species sharing similar features (using PCA ); and (2) shares a similar environment (using DCA ). Changes in several guild attributes (i.e. dominance and species composition, diversity and establishment patterns) during the regulated period were compared statistically. We used pre‐ and post‐dam established vegetation bands identified based on old (1956) and modern (2006) aerial photographs and field measurements of woody species diameter. Results Responses to flow alterations varied between guilds according to ecological requirements of their species. The ability to survive water stress (i.e. ‘ Xeric ’ guilds) and drag forces caused by floods (‘Torrential’ guilds) allowed certain pioneer shrub‐dominated guilds (e.g. F lueggea tinctoria and S alix salviifolia ) to spread on newly emerged surfaces downward to the main channel after flow alterations, although new shrubland had less species diversity than pre‐dam shrubland. In contrast, new hydromorphological conditions following damming limited recruitment of native late‐successional tree guilds sensitive to floods (to drag forces, inundation and anoxia; i.e. ‘Slow‐water’ and ‘Flood‐sensitive’, respectively) and those with greater water requirements (i.e. ‘Hydric’) (e.g. A lnus glutinosa and C eltis australis ), although species diversity increased in this mature forest through co‐existence of remaining riparian species and new arrival of upland species. Conclusions Changes in several riparian attributes after flow alterations differed between guilds. Stream water declines after damming caused shifts in species‐poor pioneer shrubland downwards to the watered channel, resulting in severe declines of mature native forest. Understanding vegetation guild responses provides information about general trends in plant populations and assemblage structures expected to occur during river development and flow regulation, increasing our capacity to detect and synthesize complex flow alteration–riparian ecosystem response relationships, and anticipate irreversible impacts.

Guild

Shrubland

Dominance (genetics)

Tamarix

Perennial stream

10.1111/j.1654-1103.2011.01360.x

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Determinación del hábitat potencialmente utilizable por la especie Salmo trutta en un tramo del río Lozoya, España

Ezequiel Garcia Rodriguez Polioptro Martínez Austria Diego García de Jalón Luis Armando Ochoa Franco

espanolEn el presente trabajo se efectua la estimacion del habitat potencialmente utilizable (HPU) y del caudal que lo maximiza para los estadios de vida adulto, juvenil, alevin y freza de la especie Salmo trutta (trucha comun), especie muy apreciada en la pesca deportiva y para el consumo humano. Para tal fin, de acuerdo con la Metodologia IFIM (Instream Flow Incremental Methodology), se efectuo la simulacion del habitat fisico fluvial de un tramo de 609 m del rio Lozoya (Madrid, Espana) utilizando un modelo bidimensional de la hidrodinamica, un modelo para la simulacion del habitat y los modelos de preferencia de habitat de la especie antes mencionada. Los modelos fueron alimentados con informacion hidraulica, geomorfologica, biologica y de caracteristicas especificas del habitat obtenidas en campo. Los valores del habitat potencialmente utilizable (HPU) obtenidos para los cuatro estadios de desarrollo de la especie Salmo trutta permitieron determinar que el caudal de 1.97 m3/s maximiza el HPU para sus estadios de vida adulto, juvenil y freza, y que el caudal de 1.08 m3/s maximiza el habitat potencialmente utilizable para su estadio de desarrollo alevin. Las curvas caudal-habitat potencialmente utilizable obtenidas en el presente trabajo constituyen informacion valiosa para los usuarios y los gestores de los recursos fluviales del rio Lozoya, con miras a establecer un regimen de caudales ecologicos que permita conservar el ecosistema correspondiente y, en caso necesario, evaluar los impactos relacionados con posibles modificaciones del regimen de caudales. EnglishThis manuscript presents the estimation of the Weighted Usable Area (WUA) and the flows that maximize it for adult, juvenile, fry and spawn life stages of Salmo trutta (common trout), a valuable species for sport fishing and human consumption. To this end, following the Instream Flow Incremental Methodology (IFIM), a physical habitat simulation was carried out in a 609-m stretch of the Lozoya River (Madrid, Spain), using a twodimensional model of the hydrodynamics, a model for habitat simulation, and habitat preference models for the target species. Hydraulic, geomorfological, and biological information, as well as that related to the specific characteristics of the river habitat were obtained in field and used as input for the models.Weighted Usable Area values obtained for the Salmo trutta species allowed to determine that a 1.97- m3/s flow rate maximizes the WUA for the adult, juvenile and spawn life stages, and 1.08-m3/s flow rate maximizes the WUA for the fry life stage. The WUA-Flow curves obtained in this work provide valuable information to users and managers of the Lozoya River to determine instream flow needs and, if necessary, assess impacts related to modification of flow regime.

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Fluvial Corridor Changes Over Time in Regulated and Non‐Regulated Rivers (Upper Esla River, NW Spain)

River Research and Applications (2016)

Vanesa Martínez‐Fernández Marta González del Tánago Judit Maroto Diego García de Jalón

Abstract Over the last decades, rivers and fluvial corridors have been noticeably modified from their natural conditions. In general, damming and other in‐channel human interventions have been traditionally considered as the main drivers of change. However, recent studies highlight the influence of climate, hillslope and floodplain cover changes over fluvial corridor dynamics. The present study illustrates the channel morphology and riparian vegetation responses observed in three gravel bed rivers located in the Upper Esla River, north‐west of Spain. The entire study catchment was exposed to afforestation changes and farmland abandonment during the last decades, and two of the rivers are regulated by large dams. Analysis of historical orthophotos at different periods between 1956 and 2011 allowed quantifying channel narrowing, reduction of braiding index and vegetation encroachment along the three rivers. Field reconnaissance of landforms and vegetation structure along transects showed significant differences in species composition and age structure between the non‐regulated reach, where recruitment of Salicacea pioneer species existed, and the regulated reaches where mature and late‐seral species were much more abundant. These responses were consistent with reductions in mean annual discharge in all rivers and with flood disturbance decrease and summer minimum flow increase that were observed in the regulated rivers. Copyright © 2016 John Wiley & Sons, Ltd.

Seral community

Landform

Afforestation

10.1002/rra.3032

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Citations (36)

Session C1: Assessing Longitudinal Connectivity Affected by Cross-Sectional Barriers in a Riverine Bidirectional Network

Gonzalo Rincón Sanz Carlos Alonso Joaquín Solana Gutiérrez Santiago Saura Diego García de Jalón

Cross-sectional study

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La freza de la trucha común en la cuenca alta del río Cabriel. Resultados y utilidad para la gestión

Javier Gortázar Rubial C. Iturriaga Sainz Carlos Alonso Domingo Baeza Sanz Miguel Marchamalo

ECOHIDRAULICA realiza actualmente el estudio hidrobiologico de la cuenca alta del rio Cabriel, para la Junta de Castilla-La Mancha. En el marco de este proyecto se ha estudiado la freza de la trucha comun (Salmo trutta L.). El trabajo de campo ha sido realizado, durante el invierno 2007-2008, por Agentes de la Junta, que han tomado datos de los frezaderos detectados en cada tramo muestreado. Se ha registrado: ubicacion del tramo, fecha del muestreo, tipo de habitat, numero de frezaderos en el tramo, solapamiento, ubicacion dentro del tramo y dimensiones de los frezaderos, problematica y, en caso de ser observada, caracteristicas de la accion de freza.

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Daily mean stream temperatures at station Aravalle, Central Spain

José María Santiago Carlos Alonso Diego García de Jalón

10.1594/pangaea.879486

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Stream flow regime, temperature and climate change: the loss of fish habitat

José M. Santiago Joaquín Solana Gutiérrez Carlos Alonso Diego García de Jalón Rafael Muñoz‐Mas

This study is aimed at forecasting the changes in the suitability of brown trout habitat (Salmo trutta L.), caused by alterations in the stream temperature and the flow regime under climate change scenarios. The stream temperature and instantaneous flow in several streams in Central Spain were modelled from daily temperature and precipitation data. Logistic models were used for stream temperature modelling whereas M5? model trees were used to develop the precipitation-runoff models. These models were utilized to simulate the running flows under the climate change scenarios RCP4.5 and RCP8.5 (5thIPCC). The resulting forecasts suggested a different response of the stream temperature to the atmospheric warming in accordance with the geologic nature of basins. At the same time, significant decreases in summer flow and increases in the frequency of zero-flow events were predicted. In the future, significant declines in summer flow could exacerbate the negative impact on trout populations of increased water temperature by reducing both the suitable spatial habitat and the warming resistance of the water mass.

Brown trout

Fish habitat

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