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Browsing by Author "Alcaraz Hernández, Juan Diego"

Now showing items 1-13 of 13

Can multilayer perceptron ensembles model the ecological niche of freshwater fish species?

Muñoz Mas, Rafael; Martinez-Capel, Francisco; Alcaraz-Hernández, Juan Diego; Mouton, A. M. (Elsevier, 2015-08-10)

The potential of Multilayer Perceptron (MLP) Ensembles to explore the ecology of freshwater fish specieswas tested by applying the technique to redfin barbel (Barbus haasi Mertens, 1925), an endemic and mon-tane species ...
Data-driven fuzzy habitat suitability models for brown trout in Spanish Mediterranean rivers

Mouton, A.M.; Alcaraz-Hernández, Juan Diego; De Baets, B.; Goethals, , P.L.M; Martinez-Capel, Francisco (Elsevier, 2010-12-30)

[EN] In recent years, fuzzy models have been acknowledged as a suitable approach for species distribution modelling due to their transparency and their ability to incorporate the ecological gradient theory. Specifically, ...
Estado de las poblaciones de trucha en los ríos de la Comunidad Valenciana y caracterización de sus hábitats

Alcaraz Hernández, Juan Diego (Universitat Politècnica de València, 2012-01-09)

Los estudios acerca de la ecología de los peces tienen como una de sus principales bases la evaluación de las poblaciones, encaminados a definir el conjunto de los individuos de una misma especie que vive en un espacio ...
Estudio de las comunidades de los macroinvertebrados acuáticos de los ríos Ebrón y Vallanca (Valencia)

Arenas Sáez, Mercedes (Universitat Politècnica de València, 2015-04-10)

En el presente proyecto nos centraremos en calcular qué factores pueden afectar a la abundancia y diversidad de los macroinvertebrados. para ello se han analizado una serie de muestras recogidas en los años 2004 y 2005, ...
Generalized additive models to predict adult and young brown trout (Salmo trutta Linnaeus, 1758) densities in Mediterranean rivers

Alcaraz-Hernández, Juan Diego; Muñoz Mas, Rafael; Martinez-Capel, Francisco; Garófano-Gómez, Virginia; Vezza, Paolo (Wiley: 12 months, 2016-02)

Habitat suitability models (HSM) are concerned with the abundance or distribution of species as a consequence of interactions with the physical environment. Generalized Additive Models (GAMs) were used to model brown trout ...
Habitat suitability modelling at mesohabitat scale and effects of dam operation on the endangered Júcar nase, Parachondrostoma arrigonis (River Cabriel, Spain)

Soares Costa, Rui Manuel; Martinez-Capel, Francisco; Muñoz Mas, Rafael; Alcaraz-Hernández, Juan Diego; Garófano-Gómez, Virginia (Wiley-Blackwell, 2012)

Habitat degradation has reduced the complexity of the Mediterranean streams in Spain and contributed to decreasing the historical range of the endangered Júcar nase, Parachondrostoma arrigonis. This species is endemic to ...
Length weight relationships of two endemic fish species in the Júcar River Basin, Iberian Peninsula

Alcaraz-Hernández, Juan Diego; Martinez-Capel, Francisco; Olaya Marín, Esther Julia (Wiley, 2015-01)

This study provides length-weight relationship (LWRs) information for two fish species (family Cyprinidae) in two headwater streams of the Júcar River Basin (Eastern Iberian Peninsula). Both species are endemic to the ...
Mesohabitat heterogeneity in four mediterranean streams of the Jucar river basin (Eastern Spain)

Alcaraz-Hernández, Juan Diego; Martinez-Capel, Francisco; Peredo Parada, Matías Manuel; Hernández Mascarell, Aina Berta (Asociación Ibérica de Limnología, 2011)

[EN] The hydromorphological units or mesohabitats of the headwaters of four Mediterranean streams were studied by classifying them according to their length, width, average and maximum depth, percentage of substrate and ...
Microhabitat competition between Iberian fish species and the endangered Júcar nase (Parachondrostoma arrigonis; Steindachner, 1866)

Muñoz Mas, Rafael; Soares Costa, Rui Manuel; Alcaraz-Hernández, Juan Diego; Martinez-Capel, Francisco (Taylor & Francis, 2017)

[EN] Competition with invasive species is recognized as having a major impact on biodiversity conservation. The upper part of the Cabriel River (Eastern Iberian Peninsula) harbours the most important population of the Júcar ...
Modelling native fish richness to evaluate the effects of hydromorphological changes and river restoration (Júcar River Basin, Spain)

Olaya Marín, Esther Julia; Martinez-Capel, Francisco; Soares Costa, Rui Manuel; Alcaraz-Hernández, Juan Diego (Elsevier, 2012)

The richness of native fish is considered to be an indicator of aquatic ecosystem health, and improving richness is a key goal in the management of river ecosystems. An artificial neural network (ANN) model based on field ...
On species distribution modelling, spatial scales and environmental flow assessment with Multi Layer Perceptron Ensembles: A case study on the redfin barbel (Barbus haasi; Mertens, 1925)

Muñoz Mas, Rafael; Martinez-Capel, Francisco; Alcaraz-Hernández, Juan Diego; Mouton, Ans (Elsevier, 2017-01)

Inconsistent performance of Species Distribution Models (SDMs), which may depend on several factors such as the initial conditions or the applied modelling technique, is one of the greatest challenges in ecological modelling. ...
Relaciones entre densidades y biomasas de Salmo trutta fario y mediciones del mesohabitat en tramos trucheros de la Comunidad Valenciana

Alcaraz-Hernández, Juan Diego; Martinez-Capel, Francisco; Peredo Parada, Matías Manuel; Hernández Mascarell, Aina Berta (Asociación Ibérica de Limnología, 2007)

[EN] In the year 2003, populations of Salmo trutta fario were studied in the Valencian rivers. Habitat conditions were also studied along the successive hydro-morphological units in 300 m long reaches, along with geographic ...
Risk of invasion predicted with support vector machines: A case study on northern pike (Esox Lucius, L.) and bleak (Alburnus alburnus, L.)

Muñoz Mas, Rafael; Vezza, Paolo; Alcaraz-Hernández, Juan Diego; Martinez-Capel, Francisco (Elsevier, 2016-12-24)

The impacts of invasive species are recognised as a major threat to global freshwater biodiversity. The risk of invasion (probability of presence) of two avowed invasive species, the northern pike (Esox Lucius, L.) and ...