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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060
EISSN: 1678-8060
Vol. 101, No. 6, 2006, pp. 591-596
Bioline Code: oc06101
Full paper language: English
Document type: Research Article
Document available free of charge

Memórias do Instituto Oswaldo Cruz, Vol. 101, No. 6, 2006, pp. 591-596

 en Winter survival of immature instars of Mansonia indubitans check for this species in other resources Dyar & Shannon and Mansonia titillans check for this species in other resources Walker (Diptera: Culicidae), in Buenos Aires, Argentina
Juan P Torretta; Pablo R Mulieri; Luciano D Patitucci; Valeria A Sander; Patricia L Rodríguez & Nicolás Schweigmann

Abstract

We conducted a whole year research on the ecology of Mansonia indubitans check for this species in other resources and Ma. titillans in Macáes Pond, Costanera Sur Reserve, Buenos Aires, Argentina. The usage of different floating plants by immature instars and their overwintering was analized. The percentage of usage of the available floating macrophytes (Pistia, Limnobium, and Salvinia) by the larvae and pupae was studied. Also, we defined positivity (P+) as the percentage of plants with immature instars for each plant genus on a monthly basis. Ma. immature instars were captured throughout the year and Pistia was the resource most commonly exploited by the mosquitoes. The percentage of fourth-instar larvae and pupae on Pistia roots with respect to total immature instars captured was assessed on a monthly and seasonal basis. The proportion of fourth-instar larvae and pupae from both species of Mansonia on water lettuce roots, showed significant differences between months and seasons. Our results suggest that the populations of Ma. indubitans and Ma. titillans in Macáes Pond, survive during winter mainly as fourth-instar larvae.

Keywords
Mansonia indubitans - Mansonia titillans - Pistia stratiotes - winter survival - plant-animal interaction

 
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