Effects of relative humidity on the haematophagous bug Triatoma infestans: Hygropreference and eclosion success

The hygropreference of larvae and adults of the reduviid bug Triatoma infestans (Klug) was investigated along relative humidity (RH) gradients established by means of different salt solutions, as well as by H2SO4 dilutions. Both larvae and adults preferred to remain at or near 0% RH. This preference...

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Autores principales: Roca, M.J., Lazzari, C.R.
Formato: JOUR
Materias:
Chagas' disease
Eclosion
Orientation
Relative humidity
Triatominae
Triatoma infestans
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00221910_v40_n10_p901_Roca
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_00221910_v40_n10_p901_Roca2023-10-03T14:28:10Z Effects of relative humidity on the haematophagous bug Triatoma infestans: Hygropreference and eclosion success Roca, M.J. Lazzari, C.R. Chagas' disease Eclosion Orientation Relative humidity Triatominae Triatoma infestans The hygropreference of larvae and adults of the reduviid bug Triatoma infestans (Klug) was investigated along relative humidity (RH) gradients established by means of different salt solutions, as well as by H2SO4 dilutions. Both larvae and adults preferred to remain at or near 0% RH. This preference was similar for bugs reared in the laboratory under different conditions, and for those collected in the field. Several assays to control for both experimental asymmetries along the gradient and the effects of thigmotactic behaviour permit exclusion of these factors as responsible for the behaviour of the insects. The preferred RH did not vary with the time of the day or fasting. Larval insects exhibited a significant tendency to remain close to 0% RH at the time of ecdysis. The same preference was exhibited to ovipositing females. The success of ecdysis and egg hatching were measured at different RH values ranging from 0 to 75%. No differences were found between groups; eclosion success ranged from 86 to 94% for egg-hatching and from 89.5 to 95% for ecdysis, at all RHs tested. Results agree with high saturation deficits found along the geographical areas exhibiting the highest prevalence of T. infestans. However, they are in contradiction with values usually recommended to rear this species in the laboratory. The adaptive value of the hygropreference is discussed. © 1994. Fil:Roca, M.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Lazzari, C.R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00221910_v40_n10_p901_Roca
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Chagas' disease
Eclosion
Orientation
Relative humidity
Triatominae
Triatoma infestans
spellingShingle Chagas' disease
Eclosion
Orientation
Relative humidity
Triatominae
Triatoma infestans
Roca, M.J.
Lazzari, C.R.
Effects of relative humidity on the haematophagous bug Triatoma infestans: Hygropreference and eclosion success
topic_facet Chagas' disease
Eclosion
Orientation
Relative humidity
Triatominae
Triatoma infestans
description The hygropreference of larvae and adults of the reduviid bug Triatoma infestans (Klug) was investigated along relative humidity (RH) gradients established by means of different salt solutions, as well as by H2SO4 dilutions. Both larvae and adults preferred to remain at or near 0% RH. This preference was similar for bugs reared in the laboratory under different conditions, and for those collected in the field. Several assays to control for both experimental asymmetries along the gradient and the effects of thigmotactic behaviour permit exclusion of these factors as responsible for the behaviour of the insects. The preferred RH did not vary with the time of the day or fasting. Larval insects exhibited a significant tendency to remain close to 0% RH at the time of ecdysis. The same preference was exhibited to ovipositing females. The success of ecdysis and egg hatching were measured at different RH values ranging from 0 to 75%. No differences were found between groups; eclosion success ranged from 86 to 94% for egg-hatching and from 89.5 to 95% for ecdysis, at all RHs tested. Results agree with high saturation deficits found along the geographical areas exhibiting the highest prevalence of T. infestans. However, they are in contradiction with values usually recommended to rear this species in the laboratory. The adaptive value of the hygropreference is discussed. © 1994.
format JOUR
author Roca, M.J.
Lazzari, C.R.
author_facet Roca, M.J.
Lazzari, C.R.
author_sort Roca, M.J.
title Effects of relative humidity on the haematophagous bug Triatoma infestans: Hygropreference and eclosion success
title_short Effects of relative humidity on the haematophagous bug Triatoma infestans: Hygropreference and eclosion success
title_full Effects of relative humidity on the haematophagous bug Triatoma infestans: Hygropreference and eclosion success
title_fullStr Effects of relative humidity on the haematophagous bug Triatoma infestans: Hygropreference and eclosion success
title_full_unstemmed Effects of relative humidity on the haematophagous bug Triatoma infestans: Hygropreference and eclosion success
title_sort effects of relative humidity on the haematophagous bug triatoma infestans: hygropreference and eclosion success
url http://hdl.handle.net/20.500.12110/paper_00221910_v40_n10_p901_Roca
work_keys_str_mv AT rocamj effectsofrelativehumidityonthehaematophagousbugtriatomainfestanshygropreferenceandeclosionsuccess
AT lazzaricr effectsofrelativehumidityonthehaematophagousbugtriatomainfestanshygropreferenceandeclosionsuccess
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