Please use this identifier to cite or link to this item:
https://www.arca.fiocruz.br/handle/icict/48985
Type
ArticleCopyright
Open access
Collections
- IOC - Artigos de Periódicos [12973]
Metadata
Show full item record
EVALUATION OR MANSONI SPP. INFESTION ON AQUATIC PLANTS IN LENTIC AND LOTIC ENVIRONMENTS OF THE MADEIRA RIVER BASIN IN PORTO VELHO, RONDÔNIA, BRAZIL
Author
Affilliation
Instituto de Pesquisa em Patologias Tropicais. Porto Velho, RO, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Diptera. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Diptera. Rio de Janeiro, RJ, Brasil.
Energia Sustentável do Brasil (ESBR). Porto Velho, RO, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Diptera. Rio de Janeiro, RJ, Brasil.
CONICET, Instituto de Ciencias Polares, Ambiente y Recursos Naturales., Universidad Nacional de Tierra del Fuego. Ushuaia, Tierra del Fuego, Argentina.
Oikos Consultoria e Projetos. Porto Velho, RO, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Diptera. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Diptera. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Diptera. Rio de Janeiro, RJ, Brasil.
Energia Sustentável do Brasil (ESBR). Porto Velho, RO, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Diptera. Rio de Janeiro, RJ, Brasil.
CONICET, Instituto de Ciencias Polares, Ambiente y Recursos Naturales., Universidad Nacional de Tierra del Fuego. Ushuaia, Tierra del Fuego, Argentina.
Oikos Consultoria e Projetos. Porto Velho, RO, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Diptera. Rio de Janeiro, RJ, Brasil.
Abstract
The females of Mansonia are voraciously hematophagous. The spiracular apparatus of the
immature, larval, and pupal forms is adapted to perforate submerged aquatic vegetation, from whose aeriferous
aerenchyma they obtain the oxygen necessary for breathing. The proliferation of aquatic plants, in some cases linked
to anthropic modifications that reduce water flow and/or increase organic matter content, may therefore contribute to
the spread of these mosquitoes. This study aims to assess the presence of immature individuals of Mansonia in
different aquatic plants of the Madeira River basin in 10 lentic and lotic environments and correlate their population
density with abiotic factors such as water pH, dissolved O2, conductivity, and temperature. The sampling lasted from
February 2016 to June 2018, a 29-month period during which 31,287 specimens belonging to the genus Mansonia
were captured. Of the 12 species of macrophytes inspected, Eichhornia crassipes made up 70.1% of the samples.
Lentic environments accounted for 58.9% of the samples and lotic environments for 41.1%. Immature individuals
were most commonly found on Eichhornia crassipes, with this plant accounting for an average of 96.2% of all
individuals, with a percentage ranging between 58.2% and 77.1% in different breeding areas. Only at the Foz do
Igarape Jirau site was a different distribution observed, with the number of aquatic plants more nearly equal: 83.3% ´
of the larvae were found in Eichhornia crassipes, 9.2% in Ceratopteris pteridoides, 3.6% in E. azurea, 2.0% in
Salvinia sp., and 1.9% in Pistia sp. The greatest richness was found in Iguape do Raul. Concerning the larval/plant ´
relationship, although less frequent, E. azurea had a higher larval density of Mansonia spp. It is important to
emphasize that this finding may indicate a possible selection for this plant. Egg deposition by Mansonia spp. was
more abundant in sample areas with Eichhornia crassipes and Pistia sp. The number of specimens collected was
positively correlated with temperature, pH, and conductivity. These correlations showed a marked increase in the
rainy season. Therefore, we were able to establish preliminary parameters of how environmental changes influence
the ecology of this important genus of mosquitoes, the species of which are critical disease vectors.
Share