EFFECT OF MONTH AND AGE OF WORKER BEES [i]APIS MELLIFERA CARNICA [/i]ON MIDGUT FILL WITH POLLEN GRAINS
Journal Title: Zeszyty Naukowe Uniwersytetu Przyrodniczego we Wrocławiu, Biologia i Hodowla Zwierząt - Year 2011, Vol 583, Issue 0
Abstract
The aim of research was to evaluate presence of pollen grains in the midgut of [i]Apis mellifera carnica [/i]in late summer/autumn period (August, September, October) in worker bees aged 2, 7 and 13 days, when bee colonies (n = 12) have been prepared for wintering. Midgut content of pollen grains of histological preparations of midgut of at least 10 bees per colony in each age group (2, 7 and 13 days old) were analyzed as present (+) or absent (-). Data from 2009 season showed that in 2 days old worker bees pollen grains midgut fill reached the highest percentage (64,4%) in the second half of August and the lowest in the second half of October (19,6%). Share of midgut fill with pollen grains in 7-th and 13-th days of life had the same seasonal pattern as in 2 day old ones with sharp decline between August and September. Generally bees did not differ in pollen midgut fill due to their age from 2 to 13 days. Results showed that bees had three fold (P<0,05) lower share of midgut fill with pollen grains in September and October when compared to August data.
Authors and Affiliations
Maciej Howis, Paweł Chorbiński, Katarzyna Janiszewska, Piotr Nowakowski
Keywords
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