Almohamad Raki, Verheggen François, Francis Frédéric, Haubruge Eric
Department of Functional & Evolutionary Entomology, Gembloux Agricultural University, Passage des Déportés 2, BE-5030 Gembloux, Belgium.
Commun Agric Appl Biol Sci. 2007;72(3):503-8.
In the present study, we observed the effect of age of Episyrphus balteatus DeGeer (Diptera, Syrphidae) females on their fecundity and fertility (number and percentage of fertile eggs). Eight newborn E. batteatus couples were placed in separated cages (30 cm x 30 cm x 60 cm) and the number of eggs laid and the egg viability were recorded daily during 45 days. E. balteatus females had a pre-oviposition period of 10 days before mating happened. The fecundity increased steadily from day 11 to day 16 with an average of 30 eggs a day. During the following days (from day 23 to day 45), we found that the optimal fecundity was observed every second day and that 70.47% of the eggs laid during the entire life of the females were fertile. We also found that the fertility decreased significantly when the females were older than 38 days. As result, the age of hoverfly females influence significantly on their reproduction, with suggesting that hoverfly females from 2 to 5 weeks old are important agents for biological control programs.
在本研究中，我们观察了黑带食蚜蝇（双翅目，食蚜蝇科）雌虫年龄对其繁殖力和生育力（受精卵的数量和百分比）的影响。将八对新羽化的黑带食蚜蝇置于单独的笼子（30厘米×30厘米×60厘米）中，在45天内每天记录产卵数量和卵的活力。黑带食蚜蝇雌虫在交配前有10天的产卵前期。从第11天到第16天，繁殖力稳步增加，平均每天产卵30枚。在随后的日子里（从第23天到第45天），我们发现每隔一天观察到最佳繁殖力，并且雌虫一生所产的卵中有70.47%是可育的。我们还发现，当雌虫年龄超过38天时，生育力显著下降。因此，食蚜蝇雌虫的年龄对其繁殖有显著影响，这表明2至5周龄的食蚜蝇雌虫是生物防治计划的重要媒介。
