Generalized additive models to predict adult and young brown trout (Salmo trutta Linnaeus, 1758) densities in Mediterranean rivers
- Alcaraz-Hernã¡Ndez, J.D.
- Muã±Oz-Mas, R.
- MartãNez-Capel, F.
- Garã³fano-Gã³mez, V.
- Vezza, Paolo
DOIAbstract
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 (Salmo trutta L.) density as a function of environmental variables at the scale of river reach and hydromorphological units (HMU) in the Jucar River Basin (Eastern Spain). After 4 years of observations (2003-2006) the data representing trout density were split into two categories, young (<2 years) and adult (≥2 years), for modelling independently. The environmental descriptors at reach-scale described the geographical position, hydrological conditions, proportions and diversity of habitats. At the scale of HMUs (pool, gli...
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