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Digging behaviour and responses to photic and gravitational cues as elements of escape behaviour of bumblebees

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Godzinska E. J., Korczynska J.
Acta Neurobiologiae Experimentalis
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1997
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vol. 57
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issue 1
59-70
EN
We have investigated escape behaviour of workers of two bumblebee species, Bombus terrestris and B.pascuorum, when confined to test tubes plugged with soil and either exposed to sunlight or kept in darkness. In both these situations B. terrestris performed better (i. e. escaped after a shorter time) than B. pascuorum. B. terrestris (but not B. pascuorum) also performed better in darkness than in tubes exposed to sunlight. This implies that in both situations B. terrestris showed higher readiness to dig than B. pascuorum, and that in tubes exposed to sunlight only B. terrestris showed high readiness to display photopositive behaviour as well. B. pascuorum displayed, however, photopositive behaviour in another escape situation: when released in a dark room in front of a vertical array of four sources of white light. In that situation, B. pascuorum also displayed the tendency to fly upwards, based most probably on responses to gravitational cues.
2
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Effect of early illumination conditions on illumination preferences in the ant

100%
Korczynska J., Godzinska E. J.
Acta Neurobiologiae Experimentalis
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1995
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vol. 55
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issue 3
222
3
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The effect of past and present group size on resposes to prey in the ant Formica polyctena Forst

100%
Szczuka A., Godzinska E. J.
Acta Neurobiologiae Experimentalis
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1997
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vol. 57
|
issue 2
135-150
EN
We investigated the responses to insect prey (dead houseflies) in 24 'derivative groups' of workers of the ant Formica polyctena created by taking sets of 25 workers out of nine larger 'initial groups' kept in laboratory without queens and brood during the preceding five months. In the derivative groups the ants ceased to retrieve flies to their nests after a period ranging from few days to several weeks. The duration of that period did not depend on the present size of the derivative group (decreasing as a result of worker mortality), but was positively correlated with the estimated size of the initial group of the tested ants.The readiness to display venom spraying was higher in smaller derivative groups. These data demonstrate that responses ofF. polyctena to insect prey are strongly influenced both by the present and the past size of their group.
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