File:Apple pollination studies in the Annapolis Valley, N.S., Canada, 1928-1932. (1933) (19557951668).jpg

Title: Apple pollination studies in the Annapolis Valley, N.S., Canada, 1928-1932.
Identifier: applepollination162brit (find matches)
Year: 1933 (1930s)
Authors: Brittain, W. H; Canada. Dept. of Agriculture
Subjects: Apples; Fertilization of plants by insects
Publisher: Ottawa : Department of Agriculture
Contributing Library: Agriculture and Agri-Food Canada â Agriculture et Agroalimentaire Canada
Digitizing Sponsor: Agriculture and Agri-Food Canada â Agriculture et Agroalimentaire Canada

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132 late in the afternoon. It would appear that the nectar does not accumulate during the day, but ceases after a definite amount has been deposited in the nectary, the processes of secretion and reabsorption being apparently in equilib- rium. The results obtained from a study of secretion during the night varied some- what, depending upon whether successive readings were made from different blossoms or from repeated records from all the blossoms in the same clusters, the former giving the maximum results at midnight and the latter at from 8.30 to 10.50 p.m. This would seem to indicate that nectar accumulates during the night up to a certain point, which may be determined by the evaporation rate. There appears to be a positive correlation between relative humidity and nectar secretion, but in some cases this is slight. This correlation is most apparent in the night readings. Bee activity is so contingent upon a complex of factors operating simul- taneously, that it is difficult to evaluate any one of them. It is not apparent from the data secured that the activity of either wild or hive bees is closely con- nected with nectar secretion. The fact that, with temperature and light condi- tions favourable, bees show greatest activity during the morning hours may be governed partly by the greater quantity of nectar available at that time. Con- sidering the fact that different varieties in a mixed orchard are in their optimum condition at different periods and considering also the amount of nectar avail- able during apple bloom in proportion to the number of bees present, and the importance of temperature, light and wind factors, it is only to be expected that any effect due to variations in nectar availability might be effectively disguised. 9. COMPARATIVE CONSTANCY OF HIVE AND WILD BEES The following important advantage has been claimed for the hive bee: â That the hive bees show greater "flower fidelity," that is, they tend to visit only one species of flower at a time for pollen or nectar, whereas ivild species tend to visit a larger number of species. Kt^L A?e/a,//i4f //urn/*///?//?/&r£â &/?/
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w 7 8 9 ID II 12 lam Z 3 4 5 6 7 /IhCTARyT-CRHIOATt-APf-RARIRh AUAIDITY/WF- &V1LD Btt/ Fig. 65.âBee activity iri relation to nectar secretion (original)

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