Individual study: Different light regimes affect the time taken to lay eggs in captive buff-tailed bumblebee queens Bombus terrestris; laboratory experiments at the French National Institute for Agricultural Research (INRA), Lusignan, Poitou-Charentes, France
& Aupinel P. (1994) Effect of photoperiodic regimes on the oviposition of artificially overwintered Bombus terrestris L. queens and the production of sexuals. Journal of Apicultural Research, 33, 27-33
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Rear declining bumblebees in captivity
Two replicated laboratory trials in France (Tasei & Aupinel 1994, Tasei 1994) showed that an eight hour light, 16 hour dark regime imposed during rearing induces egg-laying more quickly (average 33 and 21 days respectively) in B. terrestris queens than constant dark (average 47 and 39 days), or, in one set of experiments, constant light (average 59 days to egg-laying). Both experiments found that the light:dark regime did not significantly affect the chance of a B. terrestris queen laying eggs (range 61-73% for all treatments). Tasei & Aupinel (1994) used 103 artificially hibernated laboratory reared queens confined alone in standard rearing conditions. Tasei (1994) used 200 non-hibernated laboratory reared queens anaesthetized with CO2 and confined with one B. terrestris worker.