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1

On Intraoviductal Sperm Competition in the Honeybee (Apis mellifera)

100%
Woyciechowski M., Krol E.
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vol. 44
51-53
EN
The authors investigated whether there is sperm competition in the honeybee queen's oviducts. 78 full-sister queens were artificially inseminated with equal volumes (0.75 mm3) of sperm. Each queen in the first group was inseminated with the sperm of one drone, in the second group with that of 6 brother drones, and in the third group with that of 6 unrelated drones. After 48 h the spermatozoa in the dissected spermathecae of the queens were counted. The three queen groups did not differ in the number of spermatozoa stored in their spermathecae. Although these results do not confirm a sperm-incapacitation process in the queen's oviducts, the mating behaviour of the genus Apis as a whole argues for further investigation of the hypothesis.
2

Worker genetic diversity and infection by Nosema apis in honey bee colonies

100%
Woyciechowski M., Krol E.
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EN
The hypothesis that parasites and pathogens select for polyandry in eusocial Hymenoptera was tested, using the honey bee Apis mellifera and its microsporidian parasite Nosema apis. Five honey bee colonies with low and five with high worker genetic diversity were infected with N. apis spores. At 54-56 days after inoculation, parasite spores in the workers? midguts were counted to determine whether there was a greater variation of infection intensity (spore counts per worker) in high-diversity colonies than in low-diversity ones. In all colonies there were two discrete sets of workers, with few or many parasite spores. To compare the variations of infection intensity between two colony groups, coefficients of variation were calculated for all workers examined, and for the slightly infected and strongly infected workers. The percentages of slightly infected workers in the low- and high-diversity groups were also compared. None of the comparisons between low- and high-diversity colonies showed significant differences, therefore no relation was found between honey bee workers? genetic diversity and their infection with N. apis.
3
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Senescence and learning in honeybee (Apis mellifera) workers

88%
Tofilski A.
Acta Neurobiologiae Experimentalis
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2000
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vol. 60
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issue 1
35-39
EN
Foraging by honeybee workers was investigated from the moment of the first foraging flight until death. To minimise the influence of factors other than senescence the foragers were trained to collect food from an artificial flower close to their hive. During each foraging trip the workers repeatedly visited an artificial flower, collecting one microlitre of 50% sugar solution per visit. During the first 50 flights the mean time taken to collect one portion of food decreased significantly and the number of visits to the artificial flower per flight increased significantly. During flights following the 50th flight, the mean time taken to collect one portion of food increased significantly and the number of visits to the artificial flower per flight decreased significantly. The results confirm earlier observations that the foraging behaviour of honeybee workers is not only influenced by learning, but also by the effects of senescence.
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