Effects of different narcosis procedures on initiating oviposition of prediapausing Bombus terrestris queens

Autor: J. N. Tasei
Přispěvatelé: Laboratoire de recherches de zoologie, Institut National de la Recherche Agronomique (INRA), ProdInra, Migration
Jazyk: angličtina
Rok vydání: 1994
Předmět:
Zdroj: Entomologia Experimentalis et Applicata
Entomologia Experimentalis et Applicata, Wiley, 1994, pp.273-279
ISSN: 0013-8703
1570-7458
Popis: Four experiments aimed at the stimulation of starting oviposition were carried out with bumblebee queens (Bombus terrestris L.) from colonies belonging to the ecotype of Central Western France and reared in a glasshouse. After mating, queens were narcotized with carbon dioxide, confined singly in small boxes (11 times 5 × 4.5 cm) and kept in a dark room at 28–29 °C and 60%-65% r.h. They were fed on a sugar solution and a pollen-syrup mixture. No effects were discernible if the narcosis was applied 20 to 30 days after mating instead of 5 days, nor if the queens were submitted to a 4 to 5 day period at 34 °C following narcosis. Survival rates ranged from 65% to 68%. If the queens were reared under fluorescent tubes (L8:D16) after narcosis the mean delays to egg-laying were significantly reduced compared to a dark treatment (21 days instead of 39), as was their variability (s.e. = 1.6 day instead of 3.1 days). The survival rates were respectively 73% and 67%. Under the same photoperiod (L8:D16) the CO2 narcosis repeated at a 24h interval had the same efficacy whether its duration was 10 min or 5 min. The delays to egg-laying were respectively 20 days (s.e = 1.5) and 25 days (s.e. = 4.8) with survival rates close to 73%. Egg-laying could also be induced in non-narcotized queens with a survival rate of 54% and delays to oviposition close to those of queens narcotized 2 times 10 min.
Databáze: OpenAIRE
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