The response to radiant heat and the estimation of the temperature of distant sources in Triatoma infestans

Lazzari, Cláudio R.; Núñez, Josué A.

doi:10.1016/0022-1910(89)90060-7

Cited by 106 publications

(88 citation statements)

References 18 publications

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“…As soon as bugs reach a potential host, they search for a zone of the skin to pierce, a process that involves the thermal sense (Lazzari and Núñez, 1989;Flores and Lazzari, 1996;Ferreira et al, 2007). However, it was still unknown whether these insects were able to assess the gustatory quality of the substrate before piercing the skin.…”

Section: Recognition Of An Adequate Substratementioning

confidence: 99%

Bitter stimuli modulates the feeding decision of a blood-sucking insect via two sensory inputs

Pontes

Minoli

Insaurralde

et al. 2014

Journal of Experimental Biology

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The gustatory system of animals is involved in food quality assessment and controls the feeding decision of an individual confronted with a potential alimentary source. Triatomines are haematophagous insects that feed on vertebrate blood. Once they reach a potential host, they walk over the host skin searching for an adequate site to pierce. Then, they insert their stylets and take a first sampling gorge to decide whether food is acceptable. Our work reveals that the presence of bitter compounds inhibits the feeding behavior of these bugs. Firstly, triatomines decreased their feeding behavior if substrates spread with quinine or caffeine were detected by external receptors localized exclusively in the antennae. Morphological inspections along with electrophysiological recordings revealed the existence of four gustatory sensilla located in the tip of the antenna that respond to both bitter tastants. The absence of these bitter detectors by antennal ablation reversed the observed feeding inhibition evoked by bitter compounds. Secondly, once triatomines pumped the first volume of food with bitter compounds (quinine, caffeine, berberine, salicin), a decrease in their feeding behavior was observed. Morphological inspections revealed the existence of eight gustatory sensilla located in the pharynx that might be responsible for the internal bitter detection. Finally, we found that a brief pre-exposure to bitter compounds negatively modulates the motivation of bugs to feed on an appetitive solution. Results presented here highlight the relevance of bitter taste perception in the modulation of the feeding behavior of a blood-sucking insect.

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Section: Recognition Of An Adequate Substratementioning

confidence: 99%

Bitter stimuli modulates the feeding decision of a blood-sucking insect via two sensory inputs

Pontes

Minoli

Insaurralde

et al. 2014

Journal of Experimental Biology

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“…The heat emitted by the host body constitutes a main orienting cue for triatomines, whose thermal sense and their use of thermal cues have been the object of diverse studies (e.g. Ferreira et al 2007, Flores and Lazzari 1996, Guerenstein and Lazzari 2009, Lazzari and Núñez 1989a,b, Wigglesworth and Gillett 1934. The behavioural sensitivity of triatomines to heat is extremely high and they remain the only group of blood-sucking insects where the ability to perceive the infrared radiation emitted by the host body has been demonstrated (Lazzari andNúñez 1989a, Schmitz et al 2000).…”

Section: Olfactory Behaviour: Host-seekingmentioning

confidence: 99%

Olfaction in vector-host interactions

Takken¹,

Knols²

2010

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“…T. infestans can react to irradiated heat and even dierentiate between bodies at dierent temperatures (Lazzari and NuÂ nÄ ez 1989). Previous studies in this laboratory with starved bugs on a servosphere have shown that, on their own, host odours as well as vapours of host urine and the respiratory product CO 2 all cause Rhodnius prolixus and Triatoma infestans (hereafter, Rhodnius and Triatoma) to walk upwind towards the source (Taneja and Guerin 1995).…”

Section: Introductionmentioning

confidence: 99%

Ammonia attracts the haematophagous bug Triatoma infestans : behavioural and neurophysiological data on nymphs

Taneja

Guérin

1997

Journal of Comparative Physiology A: Sensory, Neural, and Behav

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1) Nymphs of the haematophagous bug Triatoma infestans (Heteroptera: Reduviidae) are attracted to volatiles from their own faeces on a servosphere. 2) Biological substrates attractive to triatomines release NH 3 : wetted triatomine faecal papers release NH 3 at 256 ppb NH 3 from a 60-g source and stale rabbit urine at 394 ppb from 200 ml. Ammonia released from aqueous NH 3 also attracts bugs at doses of 3 ppb and 17 ppb on the servosphere. 3) Bugs typically show negative anemotaxis in a stimulus-free air-stream on the servosphere. At onset of stimulation with ammonia from either biological substrates or aqueous NH 3 the bugs stop, move their antennae, turn and walk upwind, i.e. odour-mediated anemotaxis. 4) At lower NH 3 doses a latency in attraction is recorded, but this latency disappears when the relative humidity of the stimulus delivery air-stream is dropped from 90 to 35%. 5) Electrophysiological recordings from single olfactory sensilla on antennae of Triatoma nymphs reveal two dierent types of NH 3 -excited receptors, both within grooved-peg sensilla. The responses of one of these receptor cells to NH 3 has been studied in detail and shows that the action potential discharge rate is dosedependent over the range 2±200 ppb. 6) The amplitudes of electroantennograms recorded from Triatoma nymphs to NH 3 are dose dependent over the range 5±550 ppb.

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The response to radiant heat and the estimation of the temperature of distant sources in Triatoma infestans

Cited by 106 publications

References 18 publications

Bitter stimuli modulates the feeding decision of a blood-sucking insect via two sensory inputs

Bitter stimuli modulates the feeding decision of a blood-sucking insect via two sensory inputs

Olfaction in vector-host interactions

Ammonia attracts the haematophagous bug Triatoma infestans : behavioural and neurophysiological data on nymphs

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