Bumble Bees

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Studies on Scandinavian <strong>Bumble</strong> <strong>Bees</strong> 99BiologyNest. Pittioni (1942, p. 178) states that nestsof .8. alpinus are not recorded at all, which mayjustify the mention of the three colonies below.A nest was located in regio alpina in SouthernNorway (Buskerud (Bv): Hol: 1.5 km NWHaugastol 1150 m 23 July 1967). The nestingsite, slightly sloping towards northwest, wascharacterized by growth of Betula nana Linnaeus,Vaccinium myrtillus Linnaeus and Empetrum hermaphroditumHagerup. The colony was foundedin an old rodent nest situated just below thesurface of the groind, the length of the accesstunnel being only about 2 cm. The entrance tothe nest was in between two rocks, one of whichpartly covered the colony. The nest material consistedof fragments of hay with some leaves ofEmpetrum admixed, partly plastered together bywax. The queen and most of the workers offirst brood were captured on returning from thefield loaded with pollen, i.e. the founder stilltook part in the field activity. The remainingworkers, & few of which had just emerged, weretaken as they issued from the nest or on thecomb.The data obtained from the colony are summarizedin Table IV. Two first brood workerswere missing. The cocoons from the third andfourth broods were opened and revealed thatseveral individuals from each of the batcheswere ready to emerge. Thus females and maleswould occur simultaneously in this colony. Theeggs were distributed in three egg cells individuallybuilt on the top of one female and two malecocoons. The egg cells contained 6, 6, and 5 eggsrespectively. If the healthy colony was not destroyed,all stages of young, including the eggs,might fulfil the development, emerging to queensor males. The total number of the progeny wouldthen reach 67 , 18 VE, and 49 ?? and dd respectively.Pollen bread stored beneath and adjacent tolower layers of masses of worker brood and,moreover, stuffed beneath some of the cocoonsabove, indicates that B. alpinus is a pocketmaker.Ffowever, a big lump of pollen, formedas pollen cylinder, placed directly on the groundjust apafi from the comb, indicates that the youngwere fed a mixture of pollen and nectar as well.The behaviour of the species may perhaps be asmentioned by Hobbs (1964) for another specieso.oE the subgenus, -8. balteatus Dahlbom: . . apocket-maker when rearing worker larvae to thelast instar and a pollen-storer when rearing lastinstar lawae, male, and queen larvae'.A palynological survey of the colony, set outin Table V, reflects the unusually delayed vegetationperiod that season . Salix was the predominatingfood plant up to the time the nest wasexcavated on 23 July. Pollen loads from corbiculaof worker number I and worker number 8 indicatethe start of a preference for Vaccinium andLotus corniculatus Linnaeus, that is, a change infood plants. V. myrtillus Linnaeus and V. uli-Table IV. Contents of a colony of B. alpinus (Linnaeus) excavated in Norway: Buskerud (Bv): 1.5 km NWHaugastdl ll50 m s.m. 23 Jttly 1967Queen, founder of the nestOffspring:l st brood : workers 82nd brood: workers 8imagines 16worker cocoonsworker cocoons3rd brood: male pupae4th brood, lst batch: male prepupae/pupae4th brood, 2nd batch: queen prepupae/pupae1086t2+ I emerged queen 65th brood, lst batch: queen or male larvae 8eggs in 3 batches 17Total number of progeny 6714 cocoons used as honey-potsLarge pollen-cylinder on the ground apaft from the comb
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Z k/ /4.evQ4h,"./Lt:ffNORSK ENTOMOL
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In memory ofOve Meidell (1 903- 194
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Studies on Scandinayran Bumble Bees
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Studies on Scandinavian Bumble Bees
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with a bidentate subapical process(
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Studies on Scandinavian Bwmble Rees
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stad; Meland: Brakstad, Lansvik, Me
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on Scandinavian Bumble Bees181Fig.
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sen), Time: ? loc. H TRM; Kvitsoy:
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A free drawing by G. Langhelle, fro
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Bumble Bees

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