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- W2079672392 abstract "Les mosaïques de fourmis arboricoles sont constituées d'une multitude d'espèces qui se répartissent différemment dans la canopée et sont caractérisées par leur statut de dominance. Leurs interactions s'expriment notamment par une agressivité plus ou moins prononcée en fonction de facteurs génétiques et environnementaux, à travers différents mécanismes comme le comportement territorial, la dominance hiérarchique, ou les comportements agressifs ritualisés. Ces derniers ont été observés au cours d'interactions intra- mais aussi interspécifiques toujours peu agressives, et permettent d'économiser la perte d'une ou plusieurs ouvrières au cours d'un combat dont l'issue reste incertaine. Leur étude systématique pourrait grandement faciliter la compréhension de l'évolution des mosaïques arboricoles. Tropical arboreal ants are distributed in a mosaic pattern in the canopy of forests and tree crop plantations each of them characterised by their status of dominance. One can distinguish ‘dominant’ species, characterised by extremely populous societies and highly developed interspecific as well as intraspecific territorial behaviour. They tolerate on their territory nonterritorial and less populous species classified as ‘non-dominants’. Nonetheless, many species do exist whose status is intermediary. Usually, they behave like non-dominant species but are able, under certain conditions, to defend a territory. They are cited as ‘sub-dominant’. According to the chemical trapping method employed by researchers, the structure of mosaics have most often been studied using an index of dominance, characterised by the number of negative or positive associations between one species and the others. This index only covers the relative presence or absence of the different species on the same trees. It only gives a punctual statement on the structure of the mosaic without any notion of evolution of the mosaic in time. It does not take into account the behavioural intra- and interspecific interactions. Aggressive interactions between species depend on genetic and environmental factors. Many studies have shown that aggressiveness is closely related to a mechanism of interindividual discrimination, permitting an individual to discriminate between nestmates and non-nestmates. This colonial recognition is based on the existence of a ‘colonial odour’ as a result of a blending of ‘individual odours’. Each individual odour is due to cuticular hydrocarbons which play the role of a contact pheromone. The colonial odour also depends on the environmental odour of the nest. Aggressiveness which results from this mechanism of recognition can be expressed through different mechanisms such as territorial behaviour, dominance hierarchy, and ritualised aggressive behaviour. Territorial behaviour is the expression of a strong intraspecific aggressiveness, by which workers of a colony defend an area of their vital domain against neighbouring conspecifics. In arboreal ant mosaics, dominance hierarchy can exist between dominant ants, and should explain the overturning of dominant ants in time. Ritualised behaviours were observed under intra- and interspecific low-aggressiveness conditions and allow to economise the loss of one or several workers during fights whose issue are uncertain. Their systematic study would greatly facilitate understanding of the evolution of arboreal mosaics." @default.
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- W2079672392 date "1999-07-01" @default.
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- W2079672392 title "Territorialité et agressivité intra- et interspécifique dans les mosaïques de fourmis arboricoles" @default.
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- W2079672392 doi "https://doi.org/10.1016/s0003-5017(00)87666-7" @default.
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