Distribution and hybridization between Culex pipiens and Culex quinquefasciatus (Diptera: Culicidae) in Argentina

Memórias do Instituto Oswaldo Cruz

Walter R. Almirón²  Silvia G. Humeres¹  Cristina N. Gardenal¹ 

[1] ,Universidad Nacional de Córdoba Facultad de Ciencias Exactas, Físicas y Naturales Centro de Investigaciones Entomológicas de CórdobaCórdoba,Argentina

关键词: Culex pipiens;    Culex quinquefasciatus;    geografical distribution;    intergradation area;    crossing experiments;   

DOI  :  10.1590/S0074-02761995000400007

来源: SciELO

【 摘 要 】

To better undesrtand the distribution of Culex pipiens and Cx. quinquefasciatus in Argentina, samples were collected from six localities situated in a North-South line from Castelli (Chaco Province) to Puerto Madryn (Chubut Province). Identification was based on the morphology of male genitalia. Only Cx. quinquefasciatus was found in Castelli and Esperanza, while in Rosario, 95.3% belonged to this species and 4.7% represented hybrid forms. Southern samples included only Cx. pipiens. With the purpose of verfying if Cx. pipiens and Cx. quinquefasciatus hybridize, different crosses between the two species were perfomed. All crosses produced viable egg rafts. Hatching ranged from 70 to 100%, except in one cross, female Cx. pipiens x male Cx. quinquefasciatus, where a high incompatibility was observed (11.1%hatch). The F1 hybrids obtained all crosses were fertile. The finding of hybrid forms in nature can be interpreted as evidence for subspecific status of Cx. pipiens and Cx. quinquefasciatus in Argentina.

【 授权许可】

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