• Avant-propos
• La montagne holarctique
• Originalité écologique de l'espace montagnard
• Du Subalpin à l'Alpin : incertitudes sur un écotone
• La montagne, observatoire privilégié de la biodiversité
• La diversité spécifique: éléments statistiques
• La diversité biocénotique dans les étages alpins
• Une démarche de biologie intégrative : la montagne médio-européenne
• Extension du concept d'orosystème
• Des complexes non résolus : systèmes ou nébuleuses
• Vers une vue unitaire
• Bibliographie
• Index.Abstract: This book sets out to provide a comparative study of the biosphere in the great mountain chains of the so-called holarctic, a region located between 30oN and 70oN, in which most of the world's mountains are to be found. The study is based essentially on an analysis of the vegetation as a descriptor of ecological conditions and as a guide to the management of the mountain environment. The first part of the book (chapters 1 to 3) deals with the unique nature of the conditions of mountain life, the ecological transcription of the notion of three-dimensionality and the little understood complexity of the ecotone formed by the upper limit of woody vegetation. It examines also the biodiversity of the vegetation of the vegetation of these chains (chapters 4 to 6), particularly with regard to the abundance and composition of the flora on the basis of altitude, their endemism and biocenonis in the alpine belt, with special emphasis on inter-chain comparisons. This work introduces the new concept of a subcontinental group, referred to here as an orosystem. A progressively integrative study of the Alps and then of similar mountains in Europe (chapter 7) leads on to the definition of a unit referred to as the Middle European System, which sheds new light on general problems of ecology and biogeography. The application of this concept to other eurasiatic groupings is set forth in chapter 8 and the difficulties in the case of more complex groupings (Central Asia, NW America) in chapter 9. To facilitate the transfer of data and conclusion from one system to another, chapter 10 proposes a universal nomenclature for the biological belts and their subdivisios.

Editeur : EPFL Press

Auteur(s) : Paul Ozenda

Collection : Biologie

Publication : 3 avril 2002

Edition : 1^ère édition

Support(s) : Livre papier

Nombre de pages Livre papier : 208

Format (en mm) Livre papier : 160 x 240

Poids (en grammes) : 450

Langue(s) : Français

EAN13 Livre papier : 9782880744939