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Landscape dynamics increasingly challenge agronomists to explain how and why agricultural landscapes are designed and managed by farmers. Nevertheless, agronomy is rarely included in the wide range of disciplines involved in landscape research. In this paper, we describe how landscape agronomy can help explain the relationship between farming systems and(More)
Landscape spatial organization (LSO) strongly impacts many environmental issues. Modelling agricultural landscapes and describing meaningful landscape patterns are thus regarded as key-issues for designing sustainable landscapes. Agricultural landscapes are mostly designed by farmers. Their decisions dealing with crop choices and crop allocation to land can(More)
Ovine meat production in France, which is continually regressing due to economic difficulties, is based on two main production systems. The first system is located in plains in which one part of the lambs born in the spring are fed grass, and the other part of the lambs are from out of the season parturitions following hormonal treatments and are fattened(More)
La dépression et l'apathie sont des syndromes fréquents, mais leur distinction peut être diffi cile. Pour mieux conce-voir les éléments qui les différencient, il convient de les aborder conjointement sur un plan sémiologique, étiopa-thogénique et neurophysiologique. Si la défi nition de l'état dépressif fait l'objet d'un relatif consensus, il n'en est pas(More)
Les rythmes biologiques sont essentiels à la vie et à l'adaptation de l'individu à son environnement, qui est régi par l'alternance jour-nuit (rythmes circadiens) ou par des cycles de période inférieure à 20 h (rythmes ultradiens). Les modifications fonctionnelles, comportementales, bio-chimiques d'un individu avec l'âge s'accompagnent néces-sairement de(More)