The prey consumption and prey preference of the larvae of the mosquitoCulex (Lutzia) raptor on the larvae ofCulex quinquefasciatus

The maximum consumption of the larvae of the pest and vector mosquitoCulex quinquefasciatus by the predatory mosquitoCulex (Lutzia) raptor was studied at various instars of both the predator and the prey. The prey preferences of the predator when given lavae of different instars were also investigated. The IVth instar of the predator consumed the maximum number of Ist instar and the maximum biomass of IVth instar larvae of the prey. Instars I and II of the predator preferred the Ist of the prey; instars III and IV of the predator preferred instars II and III of the prey respectively.The predator consumed an average of 157.1 larvae during its whole larval period, when each instar of the predator was given its preferred instar of the prey.     

应用聚合酶链反应技术检测库蚊抗性基因的初步研究

根据致库蚊有机磷抗性酯酶Ｂａ基因序列设计了两对引物，应用ＰＣＲ技术对广州部分地区的致倦库蚊ＯＰ抗性基因进行了测定。结果表明引物２、３扩增阳性率比引物１、２为高；实验室株及石牌、晓港、中山医医科大学、中山大学等４个地区自然种群抗性基因的扩增阳性率分别为３８％、２２．５％、２０％、１５％和７．５％。另外发现雄性库蚊出现的阳性率比雌蚊高。     

Genetic studies on gynandromorphism (sgm,gm) inCulex pipiens fatigans

Summary Individuals showing anterior-posterior gynandromorphism or somatic mosaicism of palpi respectively have been found in a laboratory strain ofCulex pipiens fatigans. The origin of the gynanders on the basis of binucleated eggs bearing anm factor and independently fertilized by male gemetes ofM andm genotype respectively has been suggested.This study was supported by the grant (No. 7/112/919/81 EMR-1), Council of Scientific and Industrial Research Govt., of India.     

致倦库蚊Culex quinquefasciatus自然种群动态与环境条件的关系

在广州地区致倦库蚊Culex quinquefasciatus自然种群每年有2个密度高峰。第一个高峰出现在1月到5月,最高密度在3月到5月中,第二个高峰出现在11月到12月。本文分析了温度、相对湿度、降雨量、大气压等物理环境因素对各虫态数量动态的影响。结果表明,上述各因素对种群动态起综合性影响,但不同因素作用的强度不同,即使是同一因素在不同时期影响的强度也有差异。在1月到4月,各虫态的密度随着温度升高而增加,5月以后,随着温度增加而下降,以1月到6月收集的种群动态的资料与温度进行相关分析,有的年份呈正关,有的年份呈负相关,在7月到12月,种群的密度随温度下降而增加,呈显著负相关。不同季节收集的卵的孵化率无明显差异。降雨量对幼虫、蛹的密度有很明显影响,呈负相关。降雨对成虫数量呈负相关影响,但未达显著水平。降雨对卵块数量影响不明显。成虫的数量与大气压成明显的正相关。     

灭幼脲Ⅰ号对致倦库蚊DNA代谢的影响

本文运用生化测定、放射性同位素标记及显微放射自显影等技术方法研究了灭幼脲Ⅰ号对致倦库蚊DNA代射的影响。结果表明,灭幼脲Ⅰ号抑制了致倦库蚊的DNA合成,降低DNA含量。     

Aberrations in the larval chaetotaxy of mosquitoes (Diptera: Culicidae) of Iran and a taxonomic note on the seta 1-C (preclypeal seta) of Culex in southwestern Asia

Morphological aberrations of setae 1-C (preclypeal seta), 2-C (inner clypeal seta) and 3-C (outer clypeal seta) observed in third- and fourth-instar larvae of Anopheles dthali, Anopheles maculipennis, Anopheles marteri, Culex hortensis, Culex theileri and Culex tritaeniorhynchus collected in Iran are discussed and illustrated. Variations in the shape, relative thickness, length and pigmentation of seta 1-C of Culex species that occur in southwestern Asia are reviewed.     

杂鳞库蚊复组28S rRNA基因5′端序列研究

对我国三带喙库蚊、环带库蚊和伪杂鳞库蚊共计79只蚊虫的28SrRNA基因5′端序列进行测定,获得的序列长度为301bp,3蚊种的该段序列相同。为设计杂鳞库蚊复组近缘种的PCR鉴别方法打下基础。     

致倦库蚊成虫寿命与环境因子的相关分析

本文通过分析致倦库蚊成虫寿命的有关资料,得到一系列成虫寿命(死亡)与环境因子相互关系的数学模型,从模型认识其活动对生态环境的要求及影响其寿命的关键因子。     

Infestation levels of Culex (Phytotelmatomyia) mosquitoes inhabiting water-filled Eryngium pandanifolium (Apiaceae) under different sunlight condition

Water accumulations in vegetal structures, known as phytotelmata, serve as aquatic habitats for many insects, including mosquitoes. Among them, Culex (Phytotelmatomyia) is composed by a few species that are highly specialized and poorly known. The objective of this study was to evaluate the association between sunlight conditions and the abundance of immature stages of Culex (Phytotelmatomyia) species in the axils of Eryngium pandanifolium. A forest patch with a dense population of E. pandanifolium in the Lower Delta of the Paraná River (Entre Ríos province, Argentina) was sampled twice a month between December and May. A total of 880 plants were inspected in 220 sample zones defined by a combination of location within the patch and sunlight condition. All individuals collected (n = 521) belonged to Culex (Phytotelmatomyia) hepperi (56%), Culex (Phytotelmatomyia) castroi (40%), and Culex (Phytotelmatomyia) renatoi (4%). According to generalized linear models, the habitat availability (i.e. water presence) was positively associated with sun exposure, but not with the location within the patch. Mosquito presence and abundance were positively related only to water volume. Coexistence of C. hepperi and C. castroi was more frequent than would be expected by chance. Further studies to understand the effects of sunlight and plant architecture on water dynamics are needed.