Journal Article

Orientation Behaviour of the Blood-sucking Bug Triatoma infestans to Short-chain Fatty Acids: Synergistic Effect of l-Lactic Acid and Carbon Dioxide

Romina B. Barrozo and Claudio R. Lazzari

in Chemical Senses

Volume 29, issue 9, pages 833-841
Published in print November 2004 | ISSN: 0379-864X
Published online November 2004 | e-ISSN: 1464-3553 | DOI: https://dx.doi.org/10.1093/chemse/bjh249
Orientation Behaviour of the Blood-sucking Bug Triatoma infestans to Short-chain Fatty Acids: Synergistic Effect of l-Lactic Acid and Carbon Dioxide

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The role of short-chain fatty acids in the host-seeking behaviour of Triatoma infestans larvae was investigated using a locomotion compensator. Several short-chain fatty acids were tested alone over a wide range of doses, or in combination with l-lactic acid (l-LA; 100 µg). Bugs showed no attractive response to single carboxylic acids, but when l-LA was added to airstreams carrying specific intensities of either propionic (C3; 100 µg), butyric (C4; 1 µg) or valeric acid (C5; 1 µg), these mixtures elicited an attractive response, evincing a synergistic effect. No orientation response was observed when caproic acid (C6) was offered with l-LA at the doses tested. Two blends were created: (1) C3, C4 and C5 combined at the effective doses when added with l-LA [C3C4C5 (1)], and (2) C3, C4 and C5 combined at a third of those intensities [C3C4C5 (2)]. Both blends were tested alone, with l-LA (100 µg), with a sub-threshold concentration of CO2 (300 p.p.m. above the ambient level), and combined with both compounds together. Oriented responses of bugs were only observed with the blend (2) added with l-LA and with the combination of this lure with CO2. This last combination evoked a behavioural response similar in intensity to that induced by a live mouse.

Keywords: carbon dioxide; host orientation; l-lactic acid, short-chain fatty acids, synergism, Triatoma infestans

Journal Article.  6141 words.  Illustrated.

Subjects: Molecular and Cell Biology

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