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Pollen gathering and population dynamics of three Liebefeld bee colonies of Apis mellifera during two consecutive years. —The amounts of pollen gathered varied from 10 to 26 kg per colony and year. 189 different pollen types were identified. The 40 major pollen types formed more than 90% of the total pollen collected. Zea mays, Brassica sp., Acer sp., Plantago lanceolata, Taraxacum officinale and Salix sp. contributed 51% of the total pollen harvest. There were great quantitative and qualitative differences between the pollen types gathered, which must be due to individual preferences. Wecould, however, not demonstrate that one colony or the other preferred uncommon pollen types. 99 of the major pollen types gathered in Switzerland by Apis mellifera were submitted to measurements of the amino acid contents and spectrum. The total amino acid contents varied from 5% of dry weight for Pinus sp. and Cupressaceae to 33% for Sarothanuius scoparius. There was no predilection for pollen types with high amino acid content. There was a close correlation between most essential amino acid levels and the total amino acid content: 44% of the measured amino acids were essential ones. Only for Hist idine, arginine and methionine this relationship was less evident. If the pollen provisions are of mixed origin, there is hardly a risk of unbalanced amino acid supply. Analysis of * Sektion Bienen, FAM, 3097 Liebefeld, Schweiz. 1 Poster präsentiert an der Jahresversammlung der SSZ in Genf, 1.-2. Mar/ 198 898 H. WILLE, M. WILLE, V. KILCHENMANN,A. IMDORF, G. BÜHLMANN population dynamics resulted into great differences in the number of bees, brood surfaces and fluctuations of these parameters. However, the ratio "bee days/reared brood cell" was rather constant, i.e. 19 days per colony and year. The correlations between pollen quantity gathered, number of reared brood cells, number of bee days and life expectancy were loose.

Pollenernte und Massenwechsel von drei Apis mellifera-Völkern auf demselben Bienenstand in zwei aufeinanderfogenden Jahren