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The effect ofBlastocrithidia triatomae(Trypanosomatidae) on the reduviid bugTriatoma infestans: Influence of group size

Authors
Journal
Journal of Invertebrate Pathology
0022-2011
Publisher
Elsevier
Publication Date
Volume
56
Issue
2
Identifiers
DOI: 10.1016/0022-2011(90)90108-i
Keywords
  • Triatoma Infestans
  • Blastocrithidia Triatomae
  • Pathogenic Trypanosomatid
  • Larval Development
  • Larval Mortality
  • Overcrowding
  • Isolation
  • Chagas' Disease
Disciplines
  • Biology
  • Medicine

Abstract

Abstract Developmental time and mortality in uninfected larvae of the reduviid bug Triatoma infestans and in those infected by feeding a mixture of blood and cysts of the homoxenous trypanosomatid Blastocrithidia triatomae were compared. Larvae were maintained isolated in 77-cm 3 (area 9.6 cm 2) beakers or in groups of 20, 30, 40, and 50 bugs per 1-liter beaker (area 722 cm 2). In uninfected groups, only a minor proportion of isolated bugs showed delayed development, but in groups infected with B. triatomae, additionally, a retardation in groups of 50 larvae occurred. Infected bugs needed more time to complete development in fourth and fifth instar than did uninfected bugs. Mean mortality rates of about 10% in uninfected groups were unaffected by group size. Mortality rates in most groups of infected bugs were about 50%, but in groups consisting of 50 larvae a statistically significant higher mortality rate of 75% was observed. This indicates a subpathological overcrowding stress, increased by the synergistic action of the flagellate.

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