The role of the antennae in Triatoma infestans: Orientation towards thermal sources

The behaviour of Triatoma infestans (Hemiptera: Reduviidae) in response to thermal stimulation was studied. We analysed the effect of a heat source on the locomotion activity, and antennal movements of tethered insects. Antennal movements were studied both in the horizontal and vertical planes, and...

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Autores principales:	Flores, G.B., Lazzari, C.R.
Formato:	JOUR
Materias:	Antennae Chagas disease Thermal orientation Triatominae
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_00221910_v42_n5_p433_Flores
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_00221910_v42_n5_p433_Flores
record_format	dspace
spelling	todo:paper_00221910_v42_n5_p433_Flores2023-10-03T14:28:11Z The role of the antennae in Triatoma infestans: Orientation towards thermal sources Flores, G.B. Lazzari, C.R. Antennae Chagas disease Thermal orientation Triatominae The behaviour of Triatoma infestans (Hemiptera: Reduviidae) in response to thermal stimulation was studied. We analysed the effect of a heat source on the locomotion activity, and antennal movements of tethered insects. Antennal movements were studied both in the horizontal and vertical planes, and related to whether locomotion was being displayed or not. In addition, we analysed the trajectories of intact and unilaterally antennectomised insects towards a warm cylinder in a closed-loop design. In the presence of a thermal source, triatomine bugs performed more antennal movements and walked faster than in its absence. Insects displayed a sequence of walking bouts and standing phases of variable length, concomitant with active antennal movements in both the horizontal and vertical planes. While walking, the antennae moved smoothly in co-ordination. When the insects stopped, the movements changed dramatically, displaying abrupt changes of direction. The trajectories of control animals were straight towards the thermal source. Unilateral antennectomy resulted in deviated trajectories towards the goal, with the deviation always occurring towards the side of the intact antenna. The trajectories were fairly straight up to the moment of the extension of the proboscis, at a fixed distance of around 15 mm between the tip of the head and the warm surface, when a sharp body turn occurred. Control animals probed the source at a position perpendicular to the warm surface. Antennectomised animals missed the goal and probed the air at a position tangential to the surface of the warm body. The function of the antennae during the approach to a potential source of food, and the mechanisms of orientation possibly involved, are discussed. Copyright © 1996 Elsevier Science Ltd. Fil:Flores, G.B. 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_v42_n5_p433_Flores
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Antennae Chagas disease Thermal orientation Triatominae
spellingShingle	Antennae Chagas disease Thermal orientation Triatominae Flores, G.B. Lazzari, C.R. The role of the antennae in Triatoma infestans: Orientation towards thermal sources
topic_facet	Antennae Chagas disease Thermal orientation Triatominae
description	The behaviour of Triatoma infestans (Hemiptera: Reduviidae) in response to thermal stimulation was studied. We analysed the effect of a heat source on the locomotion activity, and antennal movements of tethered insects. Antennal movements were studied both in the horizontal and vertical planes, and related to whether locomotion was being displayed or not. In addition, we analysed the trajectories of intact and unilaterally antennectomised insects towards a warm cylinder in a closed-loop design. In the presence of a thermal source, triatomine bugs performed more antennal movements and walked faster than in its absence. Insects displayed a sequence of walking bouts and standing phases of variable length, concomitant with active antennal movements in both the horizontal and vertical planes. While walking, the antennae moved smoothly in co-ordination. When the insects stopped, the movements changed dramatically, displaying abrupt changes of direction. The trajectories of control animals were straight towards the thermal source. Unilateral antennectomy resulted in deviated trajectories towards the goal, with the deviation always occurring towards the side of the intact antenna. The trajectories were fairly straight up to the moment of the extension of the proboscis, at a fixed distance of around 15 mm between the tip of the head and the warm surface, when a sharp body turn occurred. Control animals probed the source at a position perpendicular to the warm surface. Antennectomised animals missed the goal and probed the air at a position tangential to the surface of the warm body. The function of the antennae during the approach to a potential source of food, and the mechanisms of orientation possibly involved, are discussed. Copyright © 1996 Elsevier Science Ltd.
format	JOUR
author	Flores, G.B. Lazzari, C.R.
author_facet	Flores, G.B. Lazzari, C.R.
author_sort	Flores, G.B.
title	The role of the antennae in Triatoma infestans: Orientation towards thermal sources
title_short	The role of the antennae in Triatoma infestans: Orientation towards thermal sources
title_full	The role of the antennae in Triatoma infestans: Orientation towards thermal sources
title_fullStr	The role of the antennae in Triatoma infestans: Orientation towards thermal sources
title_full_unstemmed	The role of the antennae in Triatoma infestans: Orientation towards thermal sources
title_sort	role of the antennae in triatoma infestans: orientation towards thermal sources
url	http://hdl.handle.net/20.500.12110/paper_00221910_v42_n5_p433_Flores
work_keys_str_mv	AT floresgb theroleoftheantennaeintriatomainfestansorientationtowardsthermalsources AT lazzaricr theroleoftheantennaeintriatomainfestansorientationtowardsthermalsources AT floresgb roleoftheantennaeintriatomainfestansorientationtowardsthermalsources AT lazzaricr roleoftheantennaeintriatomainfestansorientationtowardsthermalsources
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The role of the antennae in Triatoma infestans: Orientation towards thermal sources

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