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2012 ; 3
(3
): 601-15
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How Varroa Parasitism Affects the Immunological and Nutritional Status of the
Honey Bee, Apis mellifera
#MMPMID26466617
Aronstein KA
; Saldivar E
; Vega R
; Westmiller S
; Douglas AE
Insects
2012[Jun]; 3
(3
): 601-15
PMID26466617
show ga
We investigated the effect of the parasitic mite Varroa destructor on the
immunological and nutritional condition of honey bees, Apis mellifera, from the
perspective of the individual bee and the colony. Pupae, newly-emerged adults and
foraging adults were sampled from honey bee colonies at one site in S. Texas,
USA. Varroa?infested bees displayed elevated titer of Deformed Wing Virus (DWV),
suggestive of depressed capacity to limit viral replication. Expression of genes
coding three anti-microbial peptides (defensin1, abaecin, hymenoptaecin) was
either not significantly different between Varroa-infested and uninfested bees or
was significantly elevated in Varroa-infested bees, varying with sampling date
and bee developmental age. The effect of Varroa on nutritional indices of the
bees was complex, with protein, triglyceride, glycogen and sugar levels strongly
influenced by life-stage of the bee and individual colony. Protein content was
depressed and free amino acid content elevated in Varroa-infested pupae,
suggesting that protein synthesis, and consequently growth, may be limited in
these insects. No simple relationship between the values of nutritional and
immune-related indices was observed, and colony-scale effects were indicated by
the reduced weight of pupae in colonies with high Varroa abundance, irrespective
of whether the individual pupa bore Varroa.