Memória espacial e/ou olfativa em flebotomíneos em área endêmica de leishmaniose tegumentar americana, sul do Brasil

Abstract

Relata-se os resultados de uma investigação sobre a possibilidade da existência de memória em flebotomíneos em área endêmica de leishmaniose tegumentar americana, no Estado do Paraná. Capturaram-se flebotomíneos no Recanto Marista, Doutor Camargo, Estado do Paraná, Brasil, com armadilhas de Falcão, de 15/11/2007 a 26/11/2007, em dois galinheiros (G1 e G2). Foram capturados 2.080 flebotomíneos (1.000 em G1 e 1.080 em G2), que foram marcados e soltos. Nyssomyia neivai foi a espécie mais (90,5%) freqüente. Do total solto, recapturaram-se 168 (8%) flebotomíneos e a recaptura no G2 foi significativa. Os resultados evidenciam que é possível a existência de memória espacial, olfativa e/ou a fidelidade ao hospedeiro e que isto orientem os flebotomíneos no reconhecimento dos locais onde há disponibilidade de fontes de sangue.

Dispersal and survival of Nyssomyia intermedia and Nyssomyia neivai (Diptera: Psychodidae: Phlebotominae) in a cutaneous leishmaniasis endemic area of the speleological province of the Ribeira Valley, state of São Paulo, Brazil

“…intermedia (2.6%) and Ny. neivai (5.4%) observed in the present study were lower than that for this latter species obtained by Casanova et al (2005) and Freitas et al (2009), however, the maximum range for both sexes of Ny. intermedia (180 m) and for Ny.…”

“…The majority of Ny. neivai specimens were recaptured within 24 h, which is different from the behaviour of those in the state of Paraná, observed by Freitas et al (2009), and from those of Ny. intermedia in the present study, which were captured in greater numbers between 24-48 h.…”

“…Each one of these activities may be influenced, among other factors, by the fidelity that the insects present with regards to some substrates, as observed by Freitas et al (2009) in relation to Ny. neivai, as well as by the capacity of the insects to respond to light stimuli in such a way as might result in distinct probabilities of capture depending on the techniques used.…”

Attraction of the cutaneous leishmaniasis vector Nyssomyia neivai (Diptera: Psychodidae) to host odour components in a wind tunnel

“…The results of the current work showed that groups of N. neivai used to assess baseline responses to air flow in the wind tunnel can be reused without influencing the number of flies responding to octenol, as compared to a separate group of flies with no test experience. More studies are required to determine whether the same might be generally applicable following exposure to other semiochemicals, or if any form of learning or habituation occurs in N. neivai , as reported for mosquitoes [31] and other species of sandfly [32,33]. …”

Phlebotomine Sandflies in Rural Locations in the State of Parana, Southern Brazil

“…pessoai and Pi. fischeri phlebotomines have a very common occurrence in many endemic areas of CL in Paraná State 1 11 - 12 , demonstrating that these species of phlebotomine sand flies present genetic characteristics that allow them to adapt to anthropogenic environments with distinct levels of changes and due to “a sort of” spatial, olfactory memory and/or to the host fidelity that direct them to recognize environments of blood supply, rest and reproduction 2 . The first four species were already marked with natural infection by protozoa of Leishmania genus in other regions of Brazil, showing the potential of vector insects in natural and anthropogenic environments 4 6 .…”