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Bien que l’imaginaire saharien n’évoque pas a priori la notion de biodiversité, la flore du Sahara est néanmoins bien plus diversifiée qu’il n’y paraît. Tantôt barrière ou relais pour la dispersion des espèces, le Grand Désert est en effet riche d’une histoire biogéographique très originale, dont cet ouvrage donne une première synthèse. Depuis les premières explorations botaniques sahariennes de la fin du xixe siècle, aux travaux pionniers du milieu du xxe siècle, jusqu’aux acquis biogéographiques les plus récents, l’ouvrage met en perspective l’organisation et l’évolution de la flore saharienne au sein d’un environnement changeant, tour à tour savane arborée puis terre d’une extrême aridité. Quelles sont la diversité et l’histoire de ce peuplement végétal peu connu ? Comment les flores méditerranéennes ou tropicales ont-elles pu migrer puis se maintenir dans les massifs sahariens ou sur les façades maritimes ? Quelles sont les conséquences des changements environnementaux passés et actuels ? Face aux enjeux de préservation de ce patrimoine naturel unique, l’ouvrage met l’accent sur la nécessité d’une véritable politique de conservation à l’échelle de cet immense désert. Région naturelle trop négligée par la recherche, le Sahara mérite d’être réinvesti par les sciences du vivant, et ce d’autant qu’il forme un laboratoire exceptionnel pour étudier l’impact des changements globaux en situation environnementale extrême. L’ouvrage, très documenté et abondamment illustré, fournira aux gestionnaires des milieux arides, aux écologues et biogéographes, aux enseignants et étudiants en biologie et en écologie, mais aussi aux naturalistes et simples voyageurs, un éclairage inédit sur la flore saharienne et son histoire.

Geography --- flore --- biodiversité --- végétal --- patrimoine --- conservation --- environnement --- espèces --- botanique --- biogéographie --- écologie --- histoire --- désert --- aridité --- Sahara --- Afrique

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A journal of macroecology

Biogeography --- General ecology and biosociology --- Macroevolution --- Biodiversity --- Ecology --- Macroévolution --- Biodiversité --- Biogéographie --- Ecologie --- Periodicals --- Périodiques --- Biological diversity --- Biodiversity. --- Biogeography. --- Ecology. --- Macroevolution. --- Biogéographie. --- Changement global (Environnement) --- Conservation (Environnement) --- Écologie. --- Earth Sciences --- Environmental Sciences --- Life Sciences --- Geographic Information Systems & Remote Sensing --- Geography --- Ecosystems & Ecology --- Biology --- Taxonomy & Systematics --- Zoology --- duplicates available --- United Kingdom ( UK ) --- bimonthly --- biogeography --- current periodical --- ecology --- geobotany --- phytogeography --- Balance of nature --- Bionomics --- Ecological processes --- Ecological science --- Ecological sciences --- Environment --- Environmental biology --- Oecology --- Areography (Biology) --- Geographical distribution of animals and plants --- Species --- Species distribution --- Biological diversification --- Biotic diversity --- Diversification, Biological --- Diversity, Biological --- Geographical distribution --- Evolution (Biology) --- Biocomplexity --- Ecological heterogeneity --- Numbers of species --- Environmental sciences --- Population biology

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A full monograph of this pantropical genus comprising thirty species. Including a classical taxonomic treatment as well as a general part, inter alia with embryological, karyological, palynological, phytochemical and reproductive biological data.

Botanique --- Plantkunde --- Rubiaceae --- Rubiaceae. --- Classification. --- Morphologie végétale --- Plant morphology --- Taxonomie --- taxonomy --- Pollen --- Biogéographie --- Biogeography --- Évolution --- evolution --- -#WPLT:syst --- Henriqueziaceae --- Gentianales --- Classification --- NBGB shoplist --- Paederia --- monographs --- Botany --- Africa --- evolution. --- Rubiaceae - Classification. --- #WPLT:syst --- Flore. Botanic determination guides --- Pteridophytes --- Phanerogams --- Luxembourg --- France: North --- Belgium --- Flora --- België ; flora

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Though biogeography may be simply defined--the study of the geographic distributions of organisms--the subject itself is extraordinarily complex, involving a range of scientific disciplines and a bewildering diversity of approaches. For convenience, biogeographers have recognized two research traditions: ecological biogeography and historical biogeography. This book makes sense of the profound revolution that historical biogeography has undergone in the last two decades, and of the resulting confusion over its foundations, basic concepts, methods, and relationships to other disciplines of comparative biology. Using case studies, the authors explain and illustrate the fundamentals and the most frequently used methods of this discipline. They show the reader how to tell when a historical biogeographic approach is called for, how to decide what kind of data to collect, how to choose the best method for the problem at hand, how to perform the necessary calculations, how to choose and apply a computer program, and how to interpret results.

Biogeography --- History. --- Ressource animale --- Animal resources --- Ressource végétale --- Plant resources --- Biodiversité --- Biodiversity --- Biogéographie --- Phytoécologie --- plant ecology --- History --- world --- 574.9 --- 575.8 --- #WPLT:syst --- Biogeography in general. Geographical distribution of organisms --- Evolution. Origin of species. Phylogeny --- GEO Biogeography --- biogeography --- paleogeography --- 575.8 Evolution. Origin of species. Phylogeny --- 574.9 Biogeography in general. Geographical distribution of organisms --- Areography (Biology) --- Geographical distribution of animals and plants --- Species --- Species distribution --- Biology --- Geography --- Geographical distribution

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Recent studies have greatly contributed to a better understanding of the earth's ecosystem. This abundantly illustrated book provides a fundamental introduction to the ecological zones of the geosphere. Nine terrestrial ecozones have been distinguished and described in individual chapters with respect to: distribution, climate, relief/hydrology, soil vegetation/animal lifeand land use. The first chapter provides the reader with a general introduction to each subject area. The second edition is a competely revised and updated version. A large number of new Anglo-American ecological studies are included. The book also includes more than 70 new figures and tables and detailed maps on global agricultural regions and soil classification. Another new feature is the discussion of the correlation between northern ecosystems and the carbon dioxide balance in the global atmosphere.

Ecological zones. --- Life zones. --- Zones écologiques --- Biomes --- Flore --- Flora --- Faune --- Fauna --- Zone climatique --- climatic zones --- Biogéographie --- Biogeography --- Écologie --- ecology --- Ecological zones --- Life zones --- Geography-General --- Ecology --- Earth & Environmental Sciences --- Geography --- Geografie --- Fysische geografie --- Algemeen. --- Zones écologiques --- EPUB-LIV-FT LIVGEOGR SPRINGER-B --- Biogeographic zones --- Zones, Life --- Belts, Landscape --- Ecozones --- Geographic zones --- Geozonal ecosystems --- Geozones --- Landscape belts --- Zones, Geographic --- Geography. --- Geobiology. --- Agriculture. --- Ecology. --- Geoecology. --- Environmental geology. --- Nature conservation. --- Geography, general. --- Biogeosciences. --- Geoecology/Natural Processes. --- Nature Conservation. --- Biotic communities --- Conservation of nature --- Nature --- Nature protection --- Protection of nature --- Conservation of natural resources --- Applied ecology --- Conservation biology --- Endangered ecosystems --- Natural areas --- Balance of nature --- Biology --- Bionomics --- Ecological processes --- Ecological science --- Ecological sciences --- Environment --- Environmental biology --- Oecology --- Environmental sciences --- Population biology --- Farming --- Husbandry --- Industrial arts --- Life sciences --- Food supply --- Land use, Rural --- Cosmography --- Earth sciences --- World history --- Conservation --- Ecology . --- Geoecology --- Environmental protection --- Physical geology --- Biosphere