Larviposition site selection mediated by volatile semiochemicals in Glossina palpalis gambiensis

Gimonneau Geoffrey, Ouedraogo Romaric, Salou Ernest Wendemanegde, Rayaissé Jean-Baptiste, Buatois Bruno, Solano Philippe, Dormont Laurent, Roux Olivier, Bouyer Jérémy. 2021. Larviposition site selection mediated by volatile semiochemicals in Glossina palpalis gambiensis. Ecological Entomology, 46 (2) : 301-309.

Url - jeu de données - Dataverse Cirad : https://doi.org/10.18167/DVN1/FXTTNW

Quartile : Q2, Sujet : ENTOMOLOGY

Résumé : 1. Tsetse flies (Diptera: Glossinidae) are K‐strategist species and deposit a single larva at 10‐day intervals in specific sites. As larviposition site selection strongly impacts reproductive success, the selection of larviposition sites is unlikely to be random and will be subject to strong selective processes, probably mediated by specific cues. 2. This study was designed to assess the existence of an aggregation effect in the palpalis group and to test its potential chemical nature (contact or volatile compounds). The larviposition site selection of Glossina palpalis gambiensis was studied according to the presence of conspecific and heterospecific larvae (morsitans group) buried in substrates. Three sets of experiments were performed with either individual or grouped gravid females and with or without physical access to the substrate. 3. In individual larviposition experiments, females were more likely to select trays with buried larvae than unconditioned sand (63.2% and 36.8%, respectively; P < 0.05). In the grouped experiment with substrate contact, females were more likely to larviposit in trays with conspecific (40%) or heterospecific (33%) buried larvae than in unconditioned sand (22%) or empty trays (5%; P < 0.05). The results were similar without substrate contact, but more pupae were deposited in empty trays (19%). 4. These results provide the first evidence for larval aggregation in G. p. gambiensis and suggest that larviposition site selection is mediated by volatile semiochemicals of larval or pupal origin. However, this larval aggregation does not seem to be species specific and therefore offers new options for the behavioural manipulation of these vectors.

Mots-clés Agrovoc : Glossina palpalis, Glossina, larve, ponte, performance de ponte, performance de reproduction, composé volatil, substance sémiochimique, comportement animal, comportement reproductif

Mots-clés complémentaires : Glossina palpalis gambiensis, site de ponte

Mots-clés libres : Aggregation, Behavior, Human and African animal trypanosomosis, Tsetse, Reproduction

Classification Agris : L72 - Organismes nuisibles des animaux

Champ stratégique Cirad : CTS 4 (2019-) - Santé des plantes, des animaux et des écosystèmes

Auteurs et affiliations

• Gimonneau Geoffrey, CIRAD-BIOS-UMR INTERTRYP (BFA) ORCID: 0000-0002-0613-841X - auteur correspondant
• Ouedraogo Romaric, CIRDES (BFA)
• Salou Ernest Wendemanegde, CIRDES (BFA)
• Rayaissé Jean-Baptiste, CIRDES (BFA)
• Buatois Bruno, CEFE (FRA)
• Solano Philippe, CIRDES (BFA)
• Dormont Laurent, Centre national de la recherche scientifique (FRA)
• Roux Olivier, IRD (FRA)
• Bouyer Jérémy, CIRAD-BIOS-UMR ASTRE (AUT) ORCID: 0000-0002-1913-416X

Source : Cirad-Agritrop (https://agritrop.cirad.fr/596791/)

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