By Richard M. Fox
Read or Download A monograph of the Ithomiidae (Lepidoptera) Part III: The tribe Mechanitini Fox (Memoirs - American Entomological Society) PDF
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Extra info for A monograph of the Ithomiidae (Lepidoptera) Part III: The tribe Mechanitini Fox (Memoirs - American Entomological Society)
Agricultural yields are particularly sensitive to climate, soil resources, and technology. Climate and soil conditions are different in temperate and tropical ecological zones. Furthermore, the tremendous differences in the natural plant and animal communities of the tropics and the temperate zones suggest that the productivity of the narrow range of plants used 32 IS GEOGRAPHY DESTINY? 7 GDP Density by Latitude Band GDP density (1,000 1995$/km2) 450 400 350 300 250 200 150 100 50 0 60S-50S 50S-40S 40S-30S 30S-20S 20S-10S 10S-0 0-10N 10N-20N 20N-30N 30N-40N Latitude Source: World Bank (1998) and Environmental Systems Research Institute (1996).
34 IS GEOGRAPHY DESTINY? 6 While some crops such as tree nuts or tropical fruits are clearly more productive in the tropics, few of them are major parts of the food system. 3 shows the contribution of different crop categories to the world food supply. Cereals provide half of all calories and almost as much of protein consumption. Oilcrops—the only crop category for which yields are higher in the tropical countries than in nontropical ones—contribute just 10 percent of food calories and only 3 percent of protein.
Malaria, hookworm, and schistosomiasis, in particular, are great debilitators that have been relatively easy to control in temperate zones but still defy major control efforts in the tropics. The lack of seasons makes control efforts more difficult because reproduction of the vectors of transmission takes place rather evenly throughout the year (see chapter 2 for an analysis of the seasonal patterns of vector- and water-borne diseases in Brazil). The allocation of technological investments has only reinforced the relative difficulty of controlling diseases typical of poorer areas, for the simple reason that those suffering from these diseases are too poor to pay for the vaccines or treatments, even if they have been developed or are available.