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L'oiseau dans le géosystème. Essai de cartographie de l'avifaune dans le massif de Grésigne (Tarn)

Abstract : Birds and the geosystem : mapping birdforms in the Grésigne Massif (Tarn). The reconstruction inspace and time of bird populations, as well as their environment use strategies is made possible by theapplication to ornithology of the geosystemic method. This contributes to an integrated cartography ofgeographic ornithology. It is uneasy to link birds to a defined environment, due to their mobility andtheir changing seasonal spatial demands, except in spring, with reproduction ; therefore the populationmap only refers to nesting birds. The geosystem map and that of birds are then compared. There areseveral distinct avifauna, linked schematically to the four geographic complexes indicated by the mapof geosystems. Other avifauna and local populations are linked to limited or marginal habitats. Eachbird population being studied in relation to its avifauna, the geosystemic analysis allows to understandthe consequences of human action on the evolution of geosystems and their avifauna. The birds,characteristic of a certain state of the geosystem, indicate this evolution. Each basic landscapestructure constitutes an intermediate stage which explain the ephemeral nature of these birdpopulations, but also their respective nature in time. The ornitho-geographic cartography, whichrepresents the bird population at a moment in space and time, must be regularly recreated in order tofollow their evolution in space and time.
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Bernard Alet. L'oiseau dans le géosystème. Essai de cartographie de l'avifaune dans le massif de Grésigne (Tarn). Revue Géographique des Pyrénées et du Sud-Ouest, nstitut de géographie (Toulouse), 1986, 57 (3), pp.343-362. ⟨10.3406/rgpso.1986.4953⟩. ⟨hal-02782172⟩

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