Cavity-nesting Bees Research Articles

Suitability of nesting substrates for the cavity-nesting bee Osmia rufa

SUMMARYMaterials and construction methods were investigated to improve artificial nests suitable for Osmia rufa that were simple to use and durable for several seasons. In 1999 we tested common reed (Phragmites) stalks, plastic drinking straws, plastic thermoshrink electro-insulating tubing, packing paper and grooved wooden laminates (which were assembled to form blocks with cylindrical chambers inside); these nesting tubes were all 6 mm in diameter and 22 cm long. In 2000 we tested reed, wood, cork and wooden tubes lined with plastic sheet used for inkjet printers; all tubes were 7 mm in diameter and 18 cm long. We measured the percentage of each type of material actively provisioned by female O. rufa, the number of the brood cells and cocoons in the tubes, and the number of adults that emerged. All nest tubes made of reed and those made of printer sheeting inserted into openings in wooden blocks were occupied by O. rufa. The greatest mean number of brood cells was found in nests made of wood (8.3 in 1999 and 12.2 in 2000). The number of cocoons also was highest in wooden nests (5.8 in 1999 and 9.4 in 2000). Reed stalks (4.3 cocoons per nest in 1999 and 5.2 in 2000) and cork (4.7) had the second greatest numbers of cocoons per nest. The number of cocoons was low in paper and in all types of plastic tubes. The production of adult bees per occupied nest was greatest in wooden nests (5.3 in 1999 and 8.8 in 2000). Overall the average production of bees per nest tube offered was greatest in either wood or reed stems. Managing O. rufa was easiest in the disassembled nests made of wood. The design of these nests permitted easy removal of the cocoons and nest reuse for several breeding seasons.

A new species ofVarroa(Acari: Varroidae) associated withApis koschevnikovi(Apidae: Hymenoptera) in Borneo

Abstract The general morphology and RAPD banding pattern of adult female Varroa rindereri, n. sp. collected from drone brood of Apis koschevnikovi Buttel-Reepen, a cavity-nesting bee in Borneo, is described and illustrated. This is the third known species of Varroa recorded from cavity nesting bees in Asia, the others being V. jacobsoni Oudemans and V. underwoodi Delfinado-Baker & Aggarwal. The new species resembles V. jacobsoni. Morphological and molecular differences between the two species are discussed.

Cell and Nest Construction Costs in Two Cavity-Nesting Bees (Osmia lignaria propinqua and Osmia ribifloris biedermannii) (Hymenoptera: Megachilidae)

Cell-partition and nest-plug material collecting and construction costs are measured for two populations of two species of cavity-nesting bees ( Osmia lignaria propinqua Cresson and Osmia ribifloris biedermannii Michener). Construction costs were slightly less for O. r. biedermannii using leaf material versus mud used by O. l. propinqua . The per-cell cost of collecting and construction indicates that nests of either species should contain four or more cells to equalize the cost of the nest plug. These collecting and construction costs must be combined with the pollen-nectar cost of offspring production if an accurate measure of parental investment is expected.