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2015 ; 10
(10
): e0140337
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Parasites and Pathogens of the Honeybee (Apis mellifera) and Their Influence on
Inter-Colonial Transmission
#MMPMID26451849
Forfert N
; Natsopoulou ME
; Frey E
; Rosenkranz P
; Paxton RJ
; Moritz RF
PLoS One
2015[]; 10
(10
): e0140337
PMID26451849
show ga
Pathogens and parasites may facilitate their transmission by manipulating host
behavior. Honeybee pathogens and pests need to be transferred from one colony to
another if they are to maintain themselves in a host population. Inter-colony
transmission occurs typically through honeybee workers not returning to their
home colony but entering a foreign colony ("drifting"). Pathogens might enhance
drifting to enhance transmission to new colonies. We here report on the effects
infection by ten honeybee viruses and Nosema spp., and Varroa mite infestation on
honeybee drifting. Genotyping of workers collected from colonies allowed us to
identify genuine drifted workers as well as source colonies sending out drifters
in addition to sink colonies accepting them. We then used network analysis to
determine patterns of drifting. Distance between colonies in the apiary was the
major factor explaining 79% of drifting. None of the tested viruses or Nosema
spp. were associated with the frequency of drifting. Only colony infestation with
Varroa was associated with significantly enhanced drifting. More specifically,
colonies with high Varroa infestation had a significantly enhanced acceptance of
drifters, although they did not send out more drifting workers. Since
Varroa-infested colonies show an enhanced attraction of drifting workers, and not
only those infected with Varroa and its associated pathogens, infestation by
Varroa may also facilitate the uptake of other pests and parasites.