Diverse population dynamics of three Anopheles species belonging to the Triannulatus Complex (Diptera : Culicidae)

  • Silva-do-Nascimento T
  • Lourenco-de-Oliveira R
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The Triannulatus Complex of Anopheles (Nyssorhynchus) consists of at
least three sibling species, namely Anopheles triannulatus s.s.,
Anopheles halophylus and a third undescribed member herein referred to
as An. triannulatus ``C{''}. Sympatric anophelines belonging to species
complexes, even though closely related, may exploit different
environments such as larval habitats. In this paper we hypothesize that
rainfall and seasonal flooding would distinctly influence the
availability of larval habitats and consequently the seasonal population
dynamics of sympatric members of the Triannulatus Complex. A reflection
of this is distinct seasonal biting frequencies exhibited by three
members of the Triannulatus Complex at a site in Central Brazil.
Population dynamics seem to be influenced by the water level in the
local rivers, although biting frequency of all three species was
negatively influenced by rainfall. An. triannulatus s.s. was more
abundant following the end of the rainy season, but notably 30 to 60
days after flooding. On the other hand, An. halophylus and An.
triannulatus C peaked during the middle of the dry season, when water
impoundments have no inflow, are somewhat reduced in size and the water
becomes brackish. Differences in population dynamics were greater
between An. triannulatus s.s. and An. halophylus and An. triannulatus C
than between An. halophylus and An. triannulatus C. This might reflect
differences in larval habitat exploitation and therefore spatial
segregation among these members of the complex.

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  • Teresa Fernandes Silva-do-Nascimento

  • Ricardo Lourenco-de-Oliveira

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