This paper discusses the centers of origin and diversity for bread wheat; sketches historical patterns in the sources and use of wheat genetic resources in modern plant breeding; identifies and compares indicators of genetic diversity used by social and biological scientists; reviews the relationship of wheat genetic diversity to yield stability and vulnerability to disease; develops a profile of the structure of genetic variation in wheat in the developing world today; and investigates how scientific plant breeding has influenced the structure of genetic variation among the major bread whe
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Library ResourceArticles et Livresdécembre, 1996Mexique, Canada, Guatemala, Afrique septentrionale, Asie méridionale
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Library ResourceArticles et Livresdécembre, 1996Sri Lanka, Canada, Indonésie
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Library ResourceArticles et Livresdécembre, 1996France, Philippines, Afrique du Sud, Espagne, Allemagne, Chine, Italie, Tonga, Pérou, Argentine, Royaume-Uni, Costa Rica, Géorgie, Canada
The late 20th century has witnessed increasing crises in the world's marine fisheries. A causal analysis of these reveals that a common element are various manifestations of spatial inequity. This most frequently includes the inequity of access rights to the resource, but factors such as variations in resource depletion, spatio-temporal variations in stock recruitment, the imposition of regulatory zoning, destruction of marine ecosystems and the siting of mariculture facilities are other examples. To resolve some of these problems, management practices must be improved.
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Library ResourceArticles et Livresdécembre, 1996Singapour, Tchad, Italie, Australie, Canada
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Library ResourceArticles et Livresdécembre, 1996Mali, Suède, Canada, Italie
This issue of Unasylva considers some of the issues related to forest-dwelling and forest-dependent people, and particularly their role in and relationship to sustainable forest management.
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Library ResourceArticles et Livresdécembre, 1996Eswatini, Bangladesh, Canada, Sierra Leone, Tonga, Maldives, Sri Lanka
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Library ResourceRéglementationsjanvier, 1996Amériques, Amérique septentrionale, Canada
These Regulations provide for the management and development of the Wooddale Agriculture Development Area. They contain provisions on planning, administration of the area, access rights, road construction, residential buildings, quarry, mining and drilling, residential uses, silviculture and farming.
Implements: Lands Act (S.N.L. 1991, c. 36). (2010)
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