Abstract
In the parasitic bee miteVarroa jacobsoni neurosecretory material of ten different cell groups in the synganglion was examined by victoria blue staining after oxidation. Important periods in the life of the mite correspond to definite patterns of filling in of the neurosecretory cell groups. Material of cell group 1, which is situated in the medial protocerebral area of the synganglion, supports molting and oviposition. Secretion of cell group 2, which lies between the two ganglionic masses, seems to be necessary during the whole reproductive process. Cell group 8, located at the opisthosomal ganglion where the genital nerves leave the subesophageal ganglion, seems to be mainly responsible for the initiation of reproduction. Juvenile hormone (JHIII) in the hemolymph of the bees acts on the mites as a release mechanism for reproductive behavior with entry into the brood cell of the bee. Mites on bees with a low JHIII titer that are sprayed with external JHIII show a similar neurosecretion pattern to mites parasitizing bees with a high JHIII titer. The influence of external JHIII on the degree in which the three cell groups are filled with neurosecretion is discussed with respect to the regulatory mechanisms. In this parasite-host relationship there is a clear synchronization of the reproductive cycle of the mite with the metamorphosis and hormonal regulation of the bee.
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Hänel, H. Effect of juvenile hormone (III) from the hostApis mellifera (Insecta: Hymenoptera) on the neurosecretion of the parasitic miteVarroa jacobsoni (Acari: Mesostigmata). Exp Appl Acarol 2, 257–271 (1986). https://doi.org/10.1007/BF01193958
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DOI: https://doi.org/10.1007/BF01193958