Resumo
The authors observed the feeding and defecation times of the nymphs of T. melanosoma Martínez, Olmedo & Carcavallo, 1987. Two groups were studied, one maintained under controlled conditions of temperature and humidity, and the other under ambient conditions. There was no significant difference in the number of bloodmeals accomplished by the nymphs of the two groups. Until the fourth instar the nymphs needed less than two bloodmeals to reach the subsequent instar, and only in the fifth instar did they require more than three bloodmeals to reach adulthood. This species demonstrated great avidity to feed; in about 70% of the observed cases the insects initiated feeding in less than one minute. Full engorgement was also reached quickly; more than 70% of the bloodmeals lasted for 5 to 15 minutes. In the first three instars more than 70% of defecation was observed immediately after feeding, demonstrating a good vectorial potential. The differences in the conditions under which the insects were maintained, were insufficient to cause a significant difference in the results observed between the two groups studied.
Triatominae; Triatoma melanosoma; feeding and defecation times
Triatominae; Triatoma melanosoma; feeding and defecation times
Tempo de alimentação e defecação das ninfas de Triatoma melanosoma Martínez, Olmedo & Carcavallo (Hemiptera, Reduviidae) em diferentes condições de temperatura e umidade
Feeding and defecation times of nymphs of Triatoma melanosoma Martínez, Olmedo & Carcavallo (Hemiptera, Reduviidae)
Cleber Galvão; Dayse da Silva Rocha; Vanda Cunha; José Jurberg; Rodolfo Carcavallo
Laboratório Nacional e Internacional de Referência em Taxonomia de Triatomíneos, Departamento de Entomologia, Instituto Oswaldo Cruz. Avenida Brasil 4365, 21045-900, Rio de Janeiro, Rio de Janeiro, Brasil. E-mail: galvao@gene.dbbm.fiocruz.br
ABSTRACT
The authors observed the feeding and defecation times of the nymphs of T. melanosoma Martínez, Olmedo & Carcavallo, 1987. Two groups were studied, one maintained under controlled conditions of temperature and humidity, and the other under ambient conditions. There was no significant difference in the number of bloodmeals accomplished by the nymphs of the two groups. Until the fourth instar the nymphs needed less than two bloodmeals to reach the subsequent instar, and only in the fifth instar did they require more than three bloodmeals to reach adulthood. This species demonstrated great avidity to feed; in about 70% of the observed cases the insects initiated feeding in less than one minute. Full engorgement was also reached quickly; more than 70% of the bloodmeals lasted for 5 to 15 minutes. In the first three instars more than 70% of defecation was observed immediately after feeding, demonstrating a good vectorial potential. The differences in the conditions under which the insects were maintained, were insufficient to cause a significant difference in the results observed between the two groups studied.
Key words: Triatominae, Triatoma melanosoma, feeding and defecation times
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AGRADECIMENTOS. Ao CNPq, FAPERJ e convênio FNS/Fiocruz nº 123/97 pelo auxílio financeiro. Ao Prof. Octavio Augusto França Presgrave pelas análises estatísticas. A dois consultores anônimos pelas críticas e sugestões.
Recebido em 14.IX.2000; aceito em 26.VI.2001.
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Datas de Publicação
-
Publicação nesta coleção
30 Abr 2009 -
Data do Fascículo
Jul 2001
Histórico
-
Recebido
14 Set 2000 -
Aceito
26 Jun 2001