Are the reproductive traits of two populations of P. quatuordecimpunctata affected by the geographic conditions and the prey species

Marjan Seiedy, M. Keshavarz
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Abstract

Life history parameters of the ladybird populations, Propylea quatuordecimpunctata (L.) (Coleoptera: Coccinellidae), collected at two locations in Iran (Karaj and Sari) were recorded on two prey species, Aphis fabae Scopoli, 1763 and Aphis gossypii Glover, 1877 (Homoptera: Aphididae). The duration of most developmental stages (egg, first, second and third instar larvae) of two local populations of P. quatuordecimpunctata differed significantly, except for the fourth instar and pupal periods. A comparison of life table parameters between the two populations with different preys, showed that the net reproductive rate (R0) was not significantly different (P > 0.05). The intrinsic rate of increase (r), the mean generation time (T) and the finite rate of increase (λ) of the population from Sari on A. gossypii, differed significantly from the same population fed on A. fabae (P < 0.05). Our results demonstrated that reproductive traits of two populations of P. quatuordecimpunctata were affected by the geographic conditions and the prey species.
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两个种群的繁殖性状是否受地理条件和猎物种类的影响
对在伊朗Karaj和Sari两个地点采集的瓢虫种群Propylea quatuordecimpunctata (L.)的生活史参数进行了记录,记录了两种猎物Aphis fabae Scopoli(1763)和gossypii Glover(1877)的生活史参数(同翅目:蚜科)。除4龄和蛹期外,两个地方种群的大部分发育阶段(卵期、1龄、2龄和3龄幼虫)的持续时间差异显著。不同饵料条件下两种群的生命表参数比较表明,净繁殖率(R0)无显著差异(P > 0.05)。棉蚜对棉蚜种群的内在增殖率(r)、平均世代时间(T)和有限增殖率(λ)均显著高于同样种群对蚕蛹的增殖率(P < 0.05)。结果表明,两个种群的繁殖性状受地理条件和猎物种类的影响。
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