Ochlerotatus albifasciatus check for this species in other resources - Aedes albifasciatus check for this species in other resources - mortality - floodwater mosquito - Strelkovimermis spiculatus check for this species in other resources - parasitism - Buenos Aires - Argentina"/>
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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060
EISSN: 1678-8060
Vol. 98, No. 2, 2003, pp. 199-208
Bioline Code: oc03055
Full paper language: English
Document type: Research Article
Document available free of charge

Memórias do Instituto Oswaldo Cruz, Vol. 98, No. 2, 2003, pp. 199-208

 en Mortality in Immatures of the Floodwater Mosquito Ochlerotatus albifasciatus check for this species in other resources (Diptera: Culicidae) and Effects of Parasitism by Strelkovimermis spiculatus check for this species in other resources (Nematoda: Mermithidae) in Buenos Aires Province, Argentina
Raúl Ernesto Campos & Victoria Elena Sy

Abstract

Life tables were constructed for six cohorts of immature stages of the floodwater mosquito Ochlerotatus albifasciatus check for this species in other resources (Macquart) in a park in Buenos Aires, highlighting the mortality attributable to the parasitic nematode, Strelkovimermis spiculatus check for this species in other resources Poinar & Camino. Two cohorts were selected to compare parasite incidence in all mosquito stages when low and high parasitism occurred. Development time of Oc. albifasciatus from first instar to adult was 7.7-10 days in the spring, 6 days in the summer, and 10.9-21.9 days in the fall. Survival was estimated as 0-1.4% in the spring, 2% in the summer and 0.2-4.4% in the fall. The highest " K " value (Killing power) occurred during a fall cohort when prevalence of the parasite was 86.9%, and the lowest in a spring cohort. Parasitism occurred during all seasons, but S. spiculatus persisted to adult only in the summer and fall, when adult mosquitoes developed from parasitized third and fourth instars larvae. The abundance of S. spiculatus differed between old and young larvae only when parasite prevalence was the highest. Although pupae and adults of Oc. albifasciatus were parasitized, no pupal mortality attributable to parasitism was recorded. The proportion of parasitized adults ranged from 14.2% and 5.7% in the two cohorts compared. Pupal wet weight and adult wing lengths did not differ between parasitized and unparasitized individuals.

Keywords
Ochlerotatus albifasciatus check for this species in other resources - Aedes albifasciatus check for this species in other resources - mortality - floodwater mosquito - Strelkovimermis spiculatus check for this species in other resources - parasitism - Buenos Aires - Argentina

 
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