SEXUAL DIMORPHISM IN THE ARISTAE OF CERATITIS CAPITATA (DIPTERA, TEPHRITIDAE) AND ITS POSSIBLE IMPORTANCE IN COURTSHIP
ABSTRACT Los machos de Ceratitis capitata criados en laboratorio tuvieron aristas más largas en promedio y en proporción al tamaño del cuerpo que las de las hembras. Las aristas de machos y hembras tenían pelos de base fija sin membrana (microtrichiae); las aristas de las hembras eran cubiertas con más pelos distribuidos de forma más homogénea que en los machos. Las aristas de las hembras además tenían más curvas en el extremo distal. Las hembras con aristas cortadas experimentalmente fueron menos montadas, y menos copuladas una vez que eran montadas, que las hembras control. Se concluye que posiblemente los estímulos detectados por sus aristas afectan la disposición de la hembra a copular.
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ABSTRACT: Tephritidae are an enormous threat to fruit and vegetable production throughout the world, causing both quantitative and qualitative losses. Investigating mating sequences could help to unravel mate choice dynamics, adding useful information to improve behaviour-based control strategies. We review current knowledge about sexual communication and related behaviours in Tephritidae, with a focus on six key agricultural pests: Anastrepha ludens, Bactrocera cucurbitae, Bactrocera dorsalis, Bactrocera oleae, Ceratitis capitata and Rhagoletis pomonella. We examine features and the role of male-male combat in lekking sites, cues affecting mating dynamics, and some fitness-promoting female behaviours that occur at oviposition sites [the use of oviposition marking pheromones (OMPs) and female-female fights for single oviposition sites]. We outline future perspectives and potential contributions of knowledge about sexual communication to Integrated Pest Management programs for tephritid pests. Sexually selected traits are frequently good indicators of male fitness and knowledge of sexual selection processes may contribute to the improvement of the Sterile Insect Technique (SIT), to select genotypes with high reproductive success, and to promote sexually selected phenotypes through mass-rearing optimization. Furthermore, males’ exposure to parapheromones, such as phenyl propanoids (PP), ginger root oil and trimedlure can enhance the mating success of sterile flies used in SIT programs. PP are also a powerful tool to improve reduced-risk monitoring dispensers and the Male Annihilation Technique, with low side effects on non-target insects. Lastly, we outline the possibility to sensitise or train mass-reared parasitoids on OMPs during the pre-release phase, in order to improve their post-release performance in the field.Journal of Pest Science 09/2014; 87(3). DOI:10.1007/s10340-014-0577-3 · 2.66 Impact Factor
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ABSTRACT: The antennal sensilla of Anastrepha serpentina (Wiedemann) (Diptera: Tephritidae) adults were studied by means of scanning electron microscopy. Both sexes have the same form and number of antennal segments. The scape and the pedicel are covered entirely by microtrichia. In the distal part of both segments, a series of longitudinally striated hairs was observed, originating in a flexible socket and ending in a pointed tip. Six types of sensilla were observed in the funiculus: 1) thick-walled multiporous pitted sensilla subtype I and subtype II, 2) thin-walled multiporous pitted sensilla long subtype I and medium length subtype II, 3) basiconic sensilla, 4) multiporous grooved sensilla, 5) clavate sensilla, and 6) an olfactory pit with two small conical and striated sensilla inside. Furthermore, there is a large quantity of microtrichia surrounding the entire funiculus. In the proximal dorso-lateral region of the funiculus, there are trichoid aristae composed of two short segments and one large segment, which have fixed base bristles or tactile hairs without membranes.Annals of the Entomological Society of America 03/2009; 102(Mar 2009):310-316. DOI:10.1603/008.102.0213 · 1.17 Impact Factor
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ABSTRACT: Sexual dimorphisms in four related species of tephritid flies were shown to be associated with differences in sexual behavior. In two species, Ceratitis capitata and C. catoirii, males and females approach closely head to head and apparently touch aristae, and the male buzzes his wings, probably fanning pheromone toward the female; the males were found to have longer aristae with fewer microsetae, and larger posterior areas of their wings than do females. These dimorphisms were absent in the other two species, C. rosa and Neoceratitis cyanescens, which court at a longer distance and in which the male does not fan pheromone toward the female prior to mounting. All three pairs of legs were proportionally longer in the males of all four species. None of the other sexually dimorphic male signalling traits showed the positive allometric slopes predicted by some theories.Journal of the Kansas Entomological Society 01/2005; DOI:10.2317/JKES-0312.02.1 · 0.40 Impact Factor