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Fig. 3

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Illustration de l’habitat physique quotidien en rivière (d’après Thévenet, 1998). Les individus utilisent des combinaisons de variables physiques (vitesses du courant, force, hauteur d’eau, substrat, abris, température…) qui peuvent varier suivant leur activité et au cours de leur développement. Les modèles de préférence sont une simplification de ces comportements individuels.

The physical habitat of organisms in rivers (from Thévenet, 1998). Aquatic organisms use combinations of several physical variables (e.g. flow velocities, shearstresses, water depth, substrate size, cover, temperature) that vary with life stages and biological activities. Hydraulic preference models are simplifications of these individual behaviors.

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