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  • 1
    Electronic Resource
    Electronic Resource
    The blind leading the blind in army ant raid patterns: Testing a model of self-organization (Hymenoptera: Formicidae) (1991)
    Springer
    Journal of insect behavior 4 (1991), S. 583-607 
    Details
    ISSN: 1572-8889
    Keywords: army ants ; behavior ; pheromones ; foraging ; self-organization ; Eciton ; mathematical model
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We present field experiments and analyses that test both the assumptions and the predictions of a model that showed how the swarm raids of the army ant Eciton burchellimight be self-organizing, i.e., based on hundreds of thousands of interactions among the foraging workers rather than a central administration or hierarchical control. We use circular mill experiments to show that the running velocity of the ants is a sigmoidal function of the strength of their trail pheromones and provide evidence that the swarm raid is structured by the interaction between outbound and inbound forager traffic mediated by the pheromones produced by both of these sets of ants. Inbound traffic is also affected by the distribution of prey, and hence, sites of prey capture alter the geometry of the raid. By manipulating the prey distributions for E. burchelliswarms, we have made them raid in a form more typical of other army ant species. Such self-organization of raids based on an interaction between the ants and their environment has profound consequences for interpretations of the evolution of army ant species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01048072
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Kinetics of larval gregarious behavior in the bark beetleDendroctonus micans (Coleoptera: Scolytidae) (1990)
    Springer
    Journal of insect behavior 3 (1990), S. 169-182 
    Details
    ISSN: 1572-8889
    Keywords: aggregation pheromones ; aggregative behavior ; collective feeding ; Dendroctonus micans ; mathematical model
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract This paper provides a simple mathematical model of the aggregation behavior of the gregarious intracortical-feeding larvae of the bark beetle, Dendroctonus micans. The model's assumptions are that each individual produces pheromones at a constant rate and reacts positively to a pheromone gradient. These hypotheses have been tested by comparing experiments and simulations, both of which showed that (1) homogeneously distributed individuals aggregate rapidly at the center of the experimental or theoretical arena and (2) eccentric, preformed groups succeed in attracting dispersed individuals, provided that the initial size of these groups is sufficiently high. There is good agreement between most of the experimental and theoretical results, providing a link among chemical communication, density of larvae, and random events occurring during the development of a spatial structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01417910
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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