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  • 1
    Publication Date: 1999-06-01
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Springer Nature
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Insectes sociaux 43 (1996), S. 111-118 
    ISSN: 1420-9098
    Keywords: Predation ; polyethism ; food exchange ; behavioral flexibility ; Ectatomma ruidum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary During laboratory experiments, two categories of prey-foraging workers were found inEctatomma ruidum: stingers and transporters. When numerous live drosophila were offered to the ants, one group of hunters specialized in killing the prey and another in transporting simultaneously the dead drosophila to the nest. Sometimes, there was a transfer of prey by a stinger towards a transporter, after an active soliciting of the transporter by antennation or by using the forelegs. We found high positive correlations between the colony size and the number of ants in each subcaste. A negative correlation existed between the colony size and the proportion of hunters. However, the proportion of workers in the two behavioral subcastes of hunters was stable in spite of differences in colony size. The phylogenetic interest of this type of cooperative predation is discussed.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1420-9098
    Keywords: Oecophylla longinoda ; orientation ; trail pheromones ; fæcal marking ; chemical communication ; tropics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Trail communication of the weaver antOecophylla longinoda is highly adapted to the African rain forests, insofar natural selection in the tropics might favour chemical trails which are durable in nature. A dry chemical trail can last over nine weeks, and over ten months when reinforced with fecal marking. The trail pheromones are resistant to rain, whether they are fresh or three months old, and whether they are reinforced or not with anal deposits.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Insectes sociaux 35 (1988), S. 92-105 
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Resume Afin de comprendre comment les fourrageuses deFormica lugubris s'orientent en milieu naturel dans la végétation arborescente, des ouvrières ont été induites à fourrager dans un système tridimensionnel simple installé au laboratoire. Le système a été conçu pour étudier le rôle respectif des repères chimiques, visuels et kinaesthésiques à la fois sur l'axe vertical et sur le plan horizontal dans des conditions expérimentales contrôlées. Les résultats indiquent que sur l'axe vertical les fourmis peuvent utiliser simultanément divers types d'informations comme par exemple des repères chimiques et une source de lumière directionnelle avec une préférence pour cette dernière en cas d'ambiguité dans la direction indiquée par les deux types d'informations. Les expériences montrent que les repères chimiques sont hautement impliqués dans l'orientation sur le plan horizontal et ils semblent de plus avoir pour les fourmis une fiabilité plus importante que les autres types de repères. Cependant, quand les repères chimiques sont absents, les fourrageuses sont toujours capables de localiser la source de nourriture en se basant uniquement sur la direction des rayons lumineux. En outre, en dépit de nos précautions méthodologiques, des repères visuels non identifiés semblent également intervenir, au moins en tant qu'information secondaire, dans l'orientation sur le plan horizontal.
    Notes: Summary In order to understand howFormica lugubris foragers orient in the vegetation, we used a simple three dimensional foraging system set-up in controlled laboratory conditions. The system was designed to investigate the respective role of chemical, visual (directional light) and kinaesthetic cues both on the vertical axis and the horizontal plane. The results indicate that on the vertical axis, ants are able to utilize simultaneously various types of directional information e.g. chemical cues and directional light, with a preference for the latter in case of conflicting information. On the horizontal plane, the orientation was found to be essentially based on external references. Amongst the latter, chemical cues have been shown to be highly implicated and seem to have a greater reliability than any other orientating information available. However, when the scent trail is removed, ants are still able to relocate the food source by using the direction of the light rays. In addition, in spite of our methodological precautions, unidentified visual landmarks were unexpectedly found to intervene as auxiliary cues in the orientation on the horizontal plane.
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  • 5
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Resume Afin d'étudier l'orientation de fourmis fourrageant dans les trois dimensions de l'espace, des ouvrières deFormica nigricans ont été observées dans leur milieu naturel alors qu'elles s'alimentaient spontanément, de jour et de nuit, sur un arbre artificiel. Les repères célestes ne semblent pas intervenir dans les directions prises par les insectes. Par contre le rôle des repères visuels terrestres et du marquage chimique des pistes est prépondérant aussi bien lors déplacements sur l'axe vertical que sur le plan horizontal. En cas de différences provoquées expérimentalement entre les directions indiquées par ces deux types de repères, les fourmis se basent préférentiellement sur les indices visuels terrestres. De plus l'utilisation de repères idiothétiques assure aux insectes une information complémentaire aux points de carrefour. D'autre part, l'orientation nocturne est essentiellement assurée par un repérage chimique. L'ensemble des résultats accrédite l'hypothèse d'une utilisation simultanée de tous les reprères disponibles au moment où se déroule l'orientation. Mais lors de situations conflictuelles, les fourmis se guident sur le repère spatialement le plus constant. L'organisation hiérarchique des repères, fréquemment rapportée dans la littérature, doit donc être largement relativisée.
    Notes: Summary In order to investigate the orientational mechanisms involved in the ants' three dimensional movements workers of the red wood antFormica nigricans were enticed to forrage, both during the day and in night, in an artifical tree set up in their natural environment. Celestial cues were found to be irrelevant in the ants' directionnality. In contrast, the results stress the importance of terrestrial and chemical landmarks both in the orientation on the vertical axis and on the horizontal plane. When a discrepancy was experimentally induced in the directional information provided by the two types of landmarks, terrestrial cues were preferred over the chemical ones. In addition, kinaesthetic information is used as a back-up orientating system at the cross-road. On the other hand, nocturnal orientation was found to be essentially based on chemical cues. These results support therefore the assumption of a simultaneous utilization of all the available directional information apart from alternative use of single cues during competitive situations and rule out the concept of an absolute hierarchie of cues.
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  • 6
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Animal Behaviour 48 (1994), S. 236-238 
    ISSN: 0003-3472
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    [s.l.] : Macmillan Magazines Ltd.
    Nature 399 (1999), S. 769-772 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Cataglyphid ants travelling between their nest and feeding site follow familiar routes along which they are guided by views of the surrounding landscape,. On bare terrain, with no landmarks available, ants can still navigate using path integration. They continually monitor their net distance ...
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  • 8
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Insect Physiology 31 (1985), S. 407-417 
    ISSN: 0022-1910
    Keywords: Vision ; cricket ; interneurones ; neck connectives
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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