Agriculture and Biodiversity: Developing Indicators for by Organization for Economic Cooperation &
By Organization for Economic Cooperation &
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52 Figure 12. Number of registered varieties with and without ‚evolutionary potential‘ (see text) (Germany, maize and cereal crops) 500 450 Number of varieties 400 350 Varieties without ’evolutionary potential’ 300 250 200 Varieties with an ’evolutionary potential’ 150 100 50 0 1992 1994 1996 1998 2000 Source: Calculated of the data from BSA, several years a). Figure 13. Average number of breeding enterprises per crop (breeding enterprises, which have registered at least one maize or cereal crop variety in Germany) 25 Number of breeders per crop 20 15 10 5 0 1992 1994 1996 Source: Calculated of the data from BSA, several years a).
Number of breeder’s associations The number of officially accredited breeder’s associations is roughly correlated with the number of independent breeding populations. The decrease in the number of breeder’s associations as shown in Figure 6 is usually based on mergers. This happens particularly with the objective to merge the previously more or less separate populations in order to increase the selection intensity in the subsequently enlarged population. A higher selection intensity implies an increasing exclusion of individuals from reproduction, coupled with an increasing risk of genetic erosion (Simon & SchulteCoerne, 1979; Sambraus, 1986).
OECD (1999c), Sustainable Economic Growth: Natural Resources and the Environment in Norway, Economics Department Working Papers No. 218, General Distribution paper [ECO/WKP(99)10], Paris France. org/ [Documentation > 1999 > Reference Components > ECO] OECD (1999d), Handbook of Incentive Measures for Biodiversity — Design and Implementation, Paris, France. 39 BIOLOGICAL DIVERSITY OF LIVESTOCK AND CROPS: USEFUL CLASSIFICATION AND APPROPRIATE AGRI-ENVIRONMENTAL INDICATORS Frank Wetterich1 1. Introduction On behalf of the German Federal Ministry for the Environment, Nature Conservation and Nuclear Safety, the Institute of Organic Agriculture is working as part of a R+D-project on agrienvironmental indicators, responsible for the categories biodiversity, wildlife habitats and landscape.