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44 resultados encontrados para: AUTOR: Beugnon, Guy
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1.
- Artículo con arbitraje
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Resumen en: Inglés |
Resumen en inglés

Ant parasitoidism has been reported in seven of the 26 recognized species of the mite genus Macrodinychus (Machrodynichidae). Macrodynichus sellnicki, previously reported as a parasitoid of the invasive ant Nylanderia fulva in Colombia, is now reported, in the same region, as attacking a native host, Ectatomma sp. 2 (E. ruidum complex). The mite develops within the protective silk cocoon of an Ectatomma pupa and waits for the emergence of the young ant before leaving the cocoon, unmolested. Overall nest prevalence was relatively high (34.6% of the 52 nests containing cocoons) but pupae prevalence was low (4.0%, n=1401 cocoons). Mite life-history (parasite or parasitoid) was context dependent, shifting according to the intensity of the attack on a same host. Contrary to the strictly parasitoidic association of M. sellnicki with N. fulva, single mite attacks against E. ruidum did not result in host killing and solitary M. sellnicki (78.6% of the cases) behaved as parasites. However, in 21.4% of the attacks (0.9% of all available host pupae) more than one mite was involved and behaved as parasitoids, draining the host of its internal fuids and killing it. This is the frst association of a macrodinychid mite with a species of the subfamily Ectatomminae, and the frst ant associated mite for which such a context dependent life-style shift is described.


2.
Artículo
*En hemeroteca, SIBE-Tapachula
High prevalence but relatively low impact of two eucharitid parasitoids attacking the Neotropical ant Ectatomma tuberculatum (Olivier)
Pérez Lachaud, Gabriela (coaut.) ; López Méndez, José Antonio (coaut.) ; Beugnon, Guy (coaut.) ; Winterton, Peter (coaut.) ; Lachaud, Jean Paul (coaut.) ;
Contenido en: Biological Control Vol. 52, no. 2 (February 2010) p. 131-139 ISSN: 1049-9644
Bibliotecas: Tapachula
Cerrar
SIBE Tapachula
44779-20 (Disponible)
Disponibles para prestamo: 1
Nota: En hemeroteca, SIBE-Tapachula
Resumen en: Inglés |
Resumen en inglés

Composition and dynamics of ant communities may be influenced by highly specialized, specific parasitoids such as eucharitids. Yet, little is known about their prevalence in ant societies. Through systematic monthly excavation of ant nests, we evaluated the impact on the Neotropical ant Ectatomma tuberculatum of two eucharitid parasitoid species, Dilocantha lachaudii and Isomerala coronata, which simultaneously attack the same host populations in southern Mexico. Nearly 90% of all the nests collected through the year were parasitized, with an average of 13% ant pupae and 6.7% ant larvae parasitized by eucharitids, and an annual loss of 17% of the ant brood. Eucharitid prevalence among host nests was, however, very variable, and only some E. tuberculatum nests were severely weakened (100% of ant brood parasitized). Parasitism was highest during the dry season (January–March), just when the production of ant pupae was minimum: up to 50.6% of the ant pupae were destroyed in March. However, production of E. tuberculatum males and females occurred later (June–July), and the reproductive potential of the host colonies did not ultimately seem to be heavily affected by eucharitid parasitism. Differences in the seasonal timing of eucharitid attack and ant reproduction thus have the potential to modulate the impact of eucharitids on ants. Our results are discussed in the context of the impact of eucharitids upon E. tuberculatum colonies and their possible effect on the community structure of this potential biocontrol agent ant.


3.
Artículo
Prey weight and overwhelming difficulty impact the choice of retrieval strategy in the Neotropical ant Gnamptogenys sulcata (F. Smith)
Daly Schveitzer, S. ; Beugnon, Guy (coaut.) ; Lachaud, Jean Paul (coaut.) ;
Contenido en: Insectes Sociaux Vol. 54, no. (2007), p. 319-328 ISSN: 0020-1812
Resumen en: Inglés |
Resumen en inglés

By regulating both the choice between solitary or collective retrieval and the level of nestmate investment for heavy prey transport, individual hunters of the ant Gnamptogenys sulcata are able to increase the foraging efficiency of the whole society, despite the extremely small size of this elite group (1 –4 hunters per colony). Their predatory behavior changes according to the static (weight, size, shape) and dynamic (mobility, escape behaviors) characteristics of the prey. The behavioral sequences resemble those of other poneromorph ants, but palpation after the approach phase is absent, probably because of the swiftness of the attack. Hunting is always performed by solitary workers but, independently of prey type and mobility, small, light prey trigger solitary retrieval whereas large, heavy prey trigger collective retrieval. For intermediate prey weights (8.5 to 21 times the hunter s weight), some variability in the strategy choice is encountered. Both static and dynamic factors are involved in assessing the difficulty of handling living prey as shown by the number of stings delivered by the hunter for prey immobilization.

However, the lack of any stinging against already dead prey indicates that these factors must be uncoupled when selecting retrieval strategies. Prey weight has a major role in this choice. For a given prey size always triggering solitary retrieval, a two-fold increase in prey weight is sufficient to trigger collective transport. Conversely, for a given prey size always triggering collective retrieval, a decrease in prey weight can trigger solitary transport. Moreover, presenting hunters with prey of “infinite” weight triggers several waves of recruitment, so that the number of recruited workers compensates for the “apparent” prey weight. Despite the inability to finely match the number of recruits to the weight of retrieved prey, recruitment strategies adopted by G. sulcata may reflect an evolutionary primitive step towards the finely graded recruitment behavior observed in closely related poneromorph species.


4.
Capítulo de libro - Memoria en extenso sin arbitraje
*Solicítelo con su bibliotecario/a
Estructura de las colonias y poliginia en la hormiga neotropical Gnamptogenys sulcata F. Smith (Hymenoptera, Formicidae, Ectatomminae)
Lachaud, Jean Paul (autor) ; Daly-Schveitzaer, Sebastien (autor) ; Cadena Carrión, Alex (autor) ; Beugnon, Guy (autor) ; Pérez Lachaud, Gabriela (autora) ;
Clasificación: AR/595.796097275 / E8
Contenido en: Entomología Mexicana, 2005 / editores: Alberto Morales Moreno, Angélica Mendoza Estrada, Marcela P. Ibarra González, Sergio Stanford Camargo Distrito Federal, México : Colegio de Posgraduados : Sociedad Mexicana de Entomología, 2005 Vol. 4, p. 176-179 ISBN:968-839-453-X (v. 4)
Bibliotecas: Campeche , San Cristóbal , Tapachula
Cerrar
SIBE Campeche
53630-30 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE San Cristóbal
ECO010018287 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE Tapachula
53630-20 (Disponible)
Disponibles para prestamo: 1
Nota: Solicítelo con su bibliotecario/a

5.
- Artículo con arbitraje
*En hemeroteca, SIBE-Tapachula
Use of long-term stored vector information in the Neotropical ant Gigantiops destructor
Beugnon, Guy ; Lachaud, Jean Paul (coaut.) ; Chagné, Philippe (coaut.) ;
Contenido en: Journal of Insect Behavior Vol. 18, no. 3 (May 2005), p. 415-432 ISSN: 0892-7553
Bibliotecas: Tapachula
Cerrar
SIBE Tapachula
46466-10 (Disponible)
Disponibles para prestamo: 1
Nota: En hemeroteca, SIBE-Tapachula
Resumen en: Inglés |
Resumen en inglés

We investigated how the formicine ant Gigantiops destructor can use vector information to navigate within the cluttered environment of the rain forest. Displaced foragers use skylight information to move in the theoretical feeder-to-nest direction, whether they are prevented from updating their path-integrator during foraging or captured at the departure from their nest, i.e. with a current accumulator state very close to zero. Only ants that have collected food are able to download a long-term stored reference vector pointing in the nest direction, irrespective of the current accumulator state of their path-integrator stored in a working memory and independent of familiar landmarks. Depending on the release sites, ants that became lost at a maximum distance of 50 cm could still hit and recognize their familiar route, or they engaged in a systematic search for it centered on the release sites. In contrast to Cataglyphis desert ants, Gigantiops ants do not rely primarily on the current accumulator state of their egocentric path integrator. Such a long-term vector-based navigation primed by food capture is well adapted for a tropical ant foraging during periods spanning several hours. This could prevent the numerous cumulative errors in the evaluation of the angles steered that might result from a continuously running path-integrator operating during complex foraging patterns performed at ground or arboreal levels and during passive displacement in response to heavy rain.


6.
Artículo
Apprentissage de routes et orientation spatiale chez un insecte sur un support en trois dimensions
Roche Labarbe, N. ; Beugnon, Guy (coaut.) ; Lachaud, Jean Paul (coaut.) ;
Contenido en: Actes des Colloques Insectes Sociaux Vol. 16 (2003), p. 52-56 ISSN: 0265-0076
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Resumen en: Frances |
Resumen en frances

De nombreux travaux ont mis en évidence chez diverses espèces de fourmis des capacités cognitives importantes, utilisées pour retrouver des sites familiers (Collett & Collett, 2002). Les deux types de stratégies visuelles les mieux décrites sont l’utilisation de repères célestes lors de l’intégration de trajets (Collett & Collett, 2000), et l’utilisation de repères terrestres lors de la navigation sur des routes familières (Pastergue-Ruiz et coll., 1995 ; Graham & Collett, 2002). Toutefois, la plupart de ces travaux ont été effectués sur des espèces terricoles, et proposaient aux individus des dispositifs en deux dimensions. Dans cette étude, nous nous sommes intéressés à l’orientation d’une fourmi arboricole néotropicale (Ectatomma tuberculatum), sur son support complexe en trois dimensions, afin de développer l'analyse des modalités d'orientation, apparemment spécifiques au milieu arboricole, décrites chez deux espèces de Formica (Fourcassié & Beugnon, 1988 ; Beugnon & Fourcassié, 1988). Le milieu arboricole présente, en effet, deux caractéristiques principales : la composante verticale de déplacement, et l’obligation, pour effectuer un trajet d’un point à un autre, de suivre les détours imposés par la position et les connexions des branches. L'objectif de ces travaux est, à terme, de comparer les capacités cognitives développées par les fourmis selon qu'elles évoluent dans un environnement bi- ou tri-dimensionnel


7.
Artículo - Memoria en extenso
Facteurs influençant le choix de la strategie predatrice chez la fourmi Gnamptogenys sulcata (Ponerinae, Ectatommini)
Daly Schveitzer, S. ; Beugnon, Guy (coaut.) ; Lachaud, Jean Paul (coaut.) ;
Clasificación: AR/595.796 / D35
Contenido en: Actes des Colloques Insectes Sociaux Vol. 15 (2002), p. 23-26 ISSN: 0265-0076
Bibliotecas: San Cristóbal
Cerrar
SIBE San Cristóbal
ECO010012877 (Disponible)
Disponibles para prestamo: 1
PDF
Resumen en: Frances |
Resumen en frances

Les fourrageuses de la fourmi ponérine néotropicale Gnamptogenys sulcata (Fr. Smith) peuvent utiliser deux stratégies prédatrices : une stratégie solitaire et une stratégie collective. Cette étude a visé à préciser les facteurs propres aux proies et aux fourmis, qui peuvent influencer le choix individuel d’une stratégie par rapport à l’autre. Un approvisionnement quotidien en proies (larves de Gryllus assimilis et de Tenebrio molitor) de poids et de taille connus, nous a permis de déterminer les seuils de déclenchement des deux stratégies. Jusqu’à 16 à 20 fois le poids d'une fourrageuse, c'est la stratégie solitaire qui est utilisée ; pour un poids supérieur et jusqu’à 60 fois le poids d'une ouvrière, c'est la stratégie collective. Bien que poids et taille soient fortement corrélés de façon logarithmique (R2 = 0,93 ou 0,94 suivant le type de proie), le poids apparaît comme le facteur principal de déclenchement du choix de la stratégie. Toutefois ces seuils sont susceptibles de varier en fonction de l'état motivationnel des fourmis. Un jeûne de 24 heures entraîne un décalage du seuil de déclenchement de la stratégie collective vers des poids supérieurs à la normale. Ce décalage persiste pendant plusieurs jours, même après retour à une alimentation quotidienne régulière.


8.
Artículo
Feeding preferences in African ponerine ants: a cafeteria experment (Hymenoptera: Formicidae)
Dejean, Alain ; Schatz, Bertrand (coaut.) ; Orivel, J. (coaut.) ; Beugnon, Guy (coaut.) ; Lachaud, Jean Paul (coaut.) ; Corbara, Bruno (coaut.) ;
Contenido en: Sociobiology Vol. 34, no. 3 (1999), p. 555-568 ISSN: 0361-6525
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9.
Artículo
Prey density and polyethism within hunting workers in the neotropical ponerine ant Ectatomma ruidum (Hymenoptera, Formicidae)
Schatz, Bertrand ; Lachaud, Jean Paul (coaut.) ; Beugnon, Guy (coaut.) ; Dejean, Alain (coaut.) ;
Contenido en: Sociobiology Vol. 33, no. 3 (1999), p. 605-617 ISSN: 0361-6525
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10.
Artículo
Sistemate recognition: the case of Anochetus traegordhi (Hymenoptera; Formicidae) Preying on Nasutitermes (Isoptera: Termitidae)
Schatz, Bertrand ; Orivel, J. (coaut.) ; Lachaud, Jean Paul (coaut.) ; Beugnon, Guy (coaut.) ; Dejean, Alain (coaut.) ;
Contenido en: Sociobiology Vol. 34, no. 3, (1999), p. 568-580 ISSN: 0361-6525
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