The figure above shows how pollen from the wild collected poppies drastically decreased along the morning - as the wild bees outside collected it - by 9:00 am there wasn't much left. The researchers then computed the rate at which their bumblebees collected pollen from the poppies, related to the available pollen at each foraging bout, by removing and counting one of the pollen pellets brough to the colony after each foraging trip by each bee.
Bumblebee pollen collection behaviour markedly changed with experience:
During their first few visits, all bees were surprisingly clumsy, one bee even failed to collect any pollen during its first foraging bout despite making 56 flower visits. In the early stages of their foraging career, bees were observed to collect pollen loads that fell apart, or were so large that they fell from the bee’s corbiculae (pollen baskets) before reaching the nest. As each bee gained foraging experience, the frequency of such events rapidly declined. Bees also changed how they used ‘buzzing’, a technique of holding the anthers in their mandibles while vibrating their flight muscles, to facilitate pollen collection. While naïve bees typically buzzed either all or no flowers, skilled foragers would selectively ‘buzz’ flowers containing less pollen.The following graph shows how foraging efficiency increases with foraging trip, indicating that bees learn to be more adept at collecting pollen. Despite this, the bees seemed to forget most of what they had learn overnight, as efficiency was much lower in the first trip of the second day than in the last trip of the previous day. :
A honeybee and a bumblebee share an Opium poppy
ReferencesRaine, N., & Chittka, L. (2006). Pollen foraging: learning a complex motor skill by bumblebees (Bombus terrestris) Naturwissenschaften, 94 (6), 459-464. DOI: 10.1007/s00114-006-0184-0
Dafni, A.; Bernhardt, P., Shmida, A., Ivri, Y. and Greenbaum, S. (1990). Red bowl-shaped flowers: convergence for beetle pollination in the Mediterranean region. Israel Journal of Botany, 39, no1-2, pp. 81-92, 81-92 Other: 0021-213X
2 comments:
I am amazed by how much the poppy flower lowers under the weight of the bumblebee visiting the flower. Presumably it has something to do with the relative weights of the bee and the flower?! It is not something I have observed so markedly when bumblebees visit other flowers. It was really interesting to learn from the article that poppies yield only pollen (not nectar) and also that as I understand it from the article collecting pollen from poppies is very much a learning process. My observations have come as a result of sewing a narrow strip of wildflower seeds aimed specifically at pollibators, in Scotland something which I ha've found incredibly rewarding.
I meant to say that as a non scientist I am amazed how in a miniscule seed is all the information, energy and stimulus needed to produce such marvellous flowers. Sometimes I wonder if the true wonder of this process is conveyed through education, both formal and informal it is surely akin to computer programming or something even more mindblowing!
Post a Comment