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Chaetodactylus krombeini

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Chaetodactylus krombeini
Scientific classification
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Genus:
Róndani, 1866
Species:
krombeini
File:Covered in mites.jpeg

Chaetodactylus krombeini, (Krombein's hairy-footed pollen mite), was described by Karl Krombein and E. W. Baker in the 1960's. The mites are about 0.5 mm across, with the females larger than the males. Pollen mites are a kleptoparasitic pest of Megachilid solitary bees, with C. krombeini found with Osmia lignaria of North America, (the Blue Orchard Mason Bee). Pollen mites do not feed on bees, but rather their provisions, and are harmful because they consume the food resources and starve or stunt the developing larvae; there is evidence that pollen mites also directly harm the egg by puncturing it.[1][2].[3]

Phoretic deuteronymph

The common name is somewhat misleading, as pollen mites consume more nectar than pollen. Both their feeding habits and their size differs significantly from Varroa destructor, the mite very harmful to the European Honey Bee. Although both are classified as mites, varroa mites are more closely related to ticks and only distantly related to Chaetodactylus.

A mason bee, upon emerging from its nest, may be burdened by hundreds of hitchiking pollen mites. While mites do shed off bees after leaving the nest, including during mating, studies find that mites are rarely picked up when visiting flowers.[4] While the mite's life cycle is necessarily tied to the bee's reproductive cycle, the mechanisms are not fully understood. They have both mobile and immobile phases that are reproductice and non-reproductive, at times simultaneously. C. krombeini appears to be more successful in humid conditions, possibly because the food mass stays moist longer under these conditions; heat and dehydration is sometimes used for pollen mite pest management.

Pollen mites in a nest cell

Identification

Because accurate identification of different pollen mite species is exacting and microscopic, and several host bees are in commerce and shipped regularly, it is likely that C. Krombeini is overidentified. Even experts express reluctance in specifying mites, such as reported in a study of Osmis pumila.[1] In Japan Chaetodactylus nipponicus is linked to the hornfaced bee, Osmia cornifrons, and in Europe Chaetodactylus osmiae is associated with the red mason bee, Osmia rufa.[5] But, C. osmiae has been recorded in eastern Oregon, where O. rufa is not known.[2]

References

  1. ^ a b O'Connor, Barry; Klimov, Pavel B. "Chaetodactylus krombeini Baker, 1962 (Acari: Chaetodactylidae)". insects.ummz.lsa.umich.edu. Retrieved 13 August 2018.
  2. ^ a b Sugden, Evan. "Mitey Bees: the Blue Orchard Bee's Mite Pest". Scarabogram, May 2000, New Series No. 241, pp. 2-3. Scarabs -- the Bug Society. Retrieved 13 August 2018.
  3. ^ Bosch, Jordi; Kemp, William P. (2001). How to Manage the Blue Orchard Bee. Beltsville, MD: Sustainable Agriculture Network handbook series ; bk. 5. pp. 68–73. ISBN 1-888626-06-2. Retrieved 13 August 2018.
  4. ^ http://idtools.org/id/mites/beemites/factsheet.php?name=15138
  5. ^ Van Asselt, Laurent (September 2000). "Observations on the life cycle ofChaetodactylus osmiae(Dufour, 1839) (Acari: Chaetodactylidae) parasitic on the solitary bee,Osmia rufa(L.), 1758 (Insecta: Hymenoptera) in Belgium". International Journal of Acarology. pp. 221–228. doi:10.1080/01647950008684192.