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This volume contains fifteen papers given at the International Workshop on African Archaeobotany in Groningen in 2003. Several papers deal with the domestication history and related aspects of specific plants, including wheat (Triticum), rice (Oryza), pearl millet (Pennisetum glaucum), fig (Ficus), cotton (Gossypium), silk-cotton (Ceiba pentandra) and baobab (Adansonia digitata). Other contributions discuss the exploitation of woody vegetations, members of the sedge family (Cyperaceae) and the botanical composition of mummy garlands. Three papers present the subfossil plant remains from Egyptian sites: Pharaonic caravan routes through the Theban Desert, Predynastic Adaïma and Napatan to Islamic Qasr Ibrim. The last contribution presents an update inventory of the ancient plant remains present in the Agricultural Museum (Dokki, Cairo). The book covers a wide range of countries and includes Namibia, Burkina Faso, Mali, Senegal, Mauritania, Canary Isles, Libya and Egypt.
Southern Africa is certainly not a naturally bounded area so that there are several possibilities for delineating it and concepts about its extent. Wellington* discussed the various possibilities for delineation and suggested that one line stands out more clearly and definitely as a physical boundary than any other, namely the South Equatorial Divide, the watershed between the ZaIre, Cuanza and Rufiji Rivers on the one hand and the Z ambezi, Cunene and Rovuma Rivers on the other. This South Equatorial Divide is indeed a major line of separation for some organisms and is also applicable in a certain geographical sense, though it does not possess the slightest significance for many other groups of organisms, ecosystems or geographical and physical features of Africa. The placing of the northern boundary of southern Africa differs in fact strongly per scientific dis cipline and is also influenced by practical considerations regarding the possibilities of scientific work as subordinate to certain political realities and historically grown traditions. This is illustrated, for example, in such works as the Flora of Southern Africa, where the northern boundary of the area is conceived as the northern and eastern political boundaries of South West Africa, South Africa and Swaziland. Botswana, traditionally included in the area covered by the Flora Zambesiaca, thus forms a large wedge in 'Southern Africa'.
In Volume 1 of this four-volume series, ecological problems of a general nature were discussed from a global point of view. Familiarity with this is essential for a full understanding of the more specialized treatment in this and subsequent volumes, for no similar approach is to be found in other ecological handbooks for beginners. This present volume deals in detail with the special ecological relation ships of the tropical and subtropical zonobiomes I to III. Most ecologists proceed from the basis of their experience in the temperate zones of the northern hemisphere. As a result, many ecological writings show a certain one-sidedness and there is a danger that generalizations made will not be broadly applicable. To avoid this, particular emphasis is laid, in this vol urne, on the special ecological features and the characteristics of the trop ical and subtropical regions. More specifically, we deal not only with the relationship of the euclimatope to zonal soils and zonal vegetation, but also pay attention to azonal conditions shown in pedobiomes and in the altitudinal belts of mountains, the orobiomes. In this and the subsequent volumes the same simple scheme is followed in treating each zonobiome: 1. climate; 2. soils; 3. producers; 4. consum ers; 5. decomposers; 6. ecosystems; 7. sub division into biomes; 8. oro biomes; 9. pedobiomes and 10. zonoecotones. Where it has appeared expedient, however, we have occasionally deviated from this scheme (see Deserts D, F, G and H).
A consideration of the ecological strategies which enable plants to survive and grow in hostile desert conditions, first published in 1992.