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首页> 外文期刊>Entomological Review >The Sex Structure of the Larval Populations of the Urban Mosquito Culex pipiens pipiens f. molestus Forskal (Diptera, Culicidae) in St. Petersburg
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The Sex Structure of the Larval Populations of the Urban Mosquito Culex pipiens pipiens f. molestus Forskal (Diptera, Culicidae) in St. Petersburg

机译：城市蚊蚊幼虫的性别结构。在圣彼得堡的molestus Forskal（Diptera，Cu科）

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摘要

The study of sex ratio in larval populations in the urban mosquito Culex pipiens pipiens f. molestus inhabiting underground sites in St. Petersburg was carried out for the first time in 1997-2001, as part of monitoring of local populations of this mosquito in order to estimate its reproductive potential. Samples of the immature stages were regularly collected in the underground breeding places flooded with water with a varying degree of pollution in five city districts (altogether 27 samples, 14 251larvae). Pupation was observed under laboratory conditions at 20°C for days. The sex was determined at the pupal stage. In 19 samples collected in basements of dwelling houses the incidence of males widely varied from 40.2 to 65.6%, and the sex ratio (males : females), from 0.7 : 1 to 1.9 : 1. Medians defining the percentage of males in the populations in different basements during a certain period (from 3 to 11 months) were 57.5%, 47.0%, and 50.2%o. The greatest incidence of males (the median being 62.2%) and sex ratio from 1.1 : 1 to 3 : 1 was observed in autumn in 1999-2001 in populations inhabiting the sewer pipe. Analysis of all the 27 samples showed that the males constituted on the average 54.5%, i.e., that is the sex ratio was close to the normal value of 1 : 1. Such important population characteristics as normal sex ratio at the pupal stage and the high autogeny rate are indicative of high reproductive potential of the urban mosquito in St. Petersburg. The hydrotechnical (mostly drainage ofbasements) and special mosquito control measures are needed to decrease mosquito abundance and restrict their further dispersal within the city.
机译：都市蚊蚊幼虫性别比的研究。为了监测其蚊子的繁殖潜力，在1997-2001年首次进行了在圣彼得堡地下猫鼬的居住活动，这是对当地蚊子种群进行监测的一部分。未成熟阶段的样品定期收集在五个市区充满水且污染程度不同的地下繁殖场所（共27个样品，14 251个幼虫）。在实验室条件下于20°C观察到化脓几天。在the期确定性别。在住宅地下室收集的19个样本中，男性的发病率从40.2到65.6％不等，性别比（男性：女性）从0.7：1到1.9：1。中位数定义了墨西哥人口中男性的百分比在一定时期内（从3到11个月），不同的地下室分别为57.5％，47.0％和50.2％o。 1999-2001年秋天，在下水道居民中，男性发病率最高（中位数为62.2％），性别比为1.1：1至3：1。对全部27个样本的分析表明，男性平均占54.5％，即，性别比接近正常值1：1。Such阶段的正常性别比和自给率表明圣彼得堡的城市蚊子有很高的繁殖潜力。需要采取水力技术（主要是地下室排水）和特殊的防蚊措施，以减少蚊子的数量并限制其在城市中的进一步扩散。

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