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  • 1
    Electronic Resource
    Electronic Resource
    Species-specific patterns in the social activities of harvester ant colonies (Pogonomyrmex) (1984)
    Springer
    Insectes sociaux 31 (1984), S. 74-86 
    Details
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Resume Cette étude faite sur le terrain dans le désert du sud-ouest des Etats-Unis différencie le comportement social de cinq espèces de fourmis moissonneuses:Pogonomyrmex barbatus, P. rugosus, P. maricopa, P. desertorum, P. californicus. Les espèces diffèrent significativement quant à leurs rythmes d'activité pour plusieurs tâches (fourragement, maintien du nid, surveillance, maintien des débris, rassemblement), ainsi que pour l'utilisation de l'espace autour du nid et la réaction de la societé à un dérangement. En général, les différences de comportement peuvent s'organiser en fonction de la quantité habituelle d'ouvrières hors du nid. Chez les espèces ayant une plus grande quantité d'ouvrières à l'extérieur du nid, l'organisation de la société met plus en valeur l'acquisition de la nourriture et la territorialité. Par contre, les espèces ayant moins d'ouvrières hors du nid ont un comportement social qui leur permet de réduire leur contact avec d'autres sociétés. En examinant les régularités temporelles et spatiales du comportment social, on peut mieux comprendre les rapports interspécifiques chez les communautés de fourmis.
    Notes: Summary This field study examines the social behavior of five sympatric species of desert seed-eating ants (Pogonomyrmex barbatus, P. rugosus, P. maricopa, P. desertorum, P. californicus). The species differed significantly in measures of activity rhythms in various colony tasks, use of space around the nest yard, and reaction to disturbance. Species differences were related to the typical size of a colony's outside work force. The behavior ofP. rugosus, P. barbatus, andP. maricopa, which had larger outside work forces, emphasized territoriality and the acquisition of food; that ofP. desertorum andP. californicus, which had smaller outside work forces, emphasized the avoidance of contact with other colonies. Examining the patterns in colony behavior can illuminate interspecific relationships in desert ant communities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02223693
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  • 2
    Electronic Resource
    Electronic Resource
    Control without hierarchy (2007)
    [s.l.] : Nature Publishing Group
    Nature 446 (2007), S. 143-143 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Because most of the dynamic systems that we design, from machines to governments, are based on hierarchical control, it is difficult to imagine a system in which the parts use only local information and the whole thing directs itself. To explain how biological systems operate without central ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/446143a
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  • 3
    Electronic Resource
    Electronic Resource
    Ecology ‘Devil's gardens’ bedevilled by ants (2005)
    [s.l.] : Nature Publishing Group
    Nature 437 (2005), S. 495-496 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] ‘Devil's gardens’ are large stands of trees in the Amazonian rainforest that consist almost entirely of a single species, Duroia hirsuta, and, according to local legend, are cultivated by an evil forest spirit. Here we show that the ant Myrmelachista schumanni, which nests in D. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/437495a
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  • 4
    Electronic Resource
    Electronic Resource
    Social insects Cuticular hydrocarbons inform task decisions (2003)
    [s.l.] : Nature Publishing Group
    Nature 423 (2003), S. 32-32 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Social insect colonies are organized without central control, and must not only accomplish many tasks, such as foraging and nest construction, but must also respond to changing conditions by adjusting the number of workers performing each task. Here we use chemically treated, artificial ants to ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/423032a
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  • 5
    Electronic Resource
    Electronic Resource
    Untangling data and theory (1993)
    [s.l.] : Nature Publishing Group
    Nature 362 (1993), S. 800-800 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] COMMUNITY ecology is struggling to bring data and theory together. Is it possible to establish any general principles of ecology? Do we need more data or better theory? This book contributes to the debate by looking at existing data on spiders. Wise considers some basic problems of community ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/362800b0
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  • 6
    Electronic Resource
    Electronic Resource
    Soldier production under threat (1996)
    [s.l.] : Nature Publishing Group
    Nature 379 (1996), S. 583-584 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SOMETIMES a theory is so appealing that it is widely accepted even though there are few data to confirm it. This is what happened with Oster and Wilson's theory of adaptive caste distributions in social insects1, in which they predicted that the distribution of specialized workers in a colony ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/379583a0
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  • 7
    Electronic Resource
    Electronic Resource
    The organization of work in social insect colonies (1996)
    [s.l.] : Nature Publishing Group
    Nature 380 (1996), S. 121-124 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] TASK allocation operates without any central or hierarchical control to direct individuals into particular tasks. The queen does not issue commands, and workers do not direct the behaviour of other workers. We can compare the diverse tasks performed by a colony to the many proteins generated by ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/380121a0
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  • 8
    Electronic Resource
    Electronic Resource
    Look to the ant, thou sluggard (1994)
    [s.l.] : Nature Publishing Group
    Nature 372 (1994), S. 292-292 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] HOLLDOBLER and Wilson have done for ants what Levis did for denim. Ants were always there, if only to be stepped on. But now it is widely recognized that ants merit the attention of any amateur natu-ralist, and that the growing numbers of researchers studying social insects are addressing some of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/372292a0
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  • 9
    Electronic Resource
    Electronic Resource
    Colony age, neighborhood density and reproductive potential in harvester ants (1999)
    Springer
    Oecologia 119 (1999), S. 175-182 
    Details
    ISSN: 1432-1939
    Keywords: Key words Harvester ants ; Life history ; Intraspecific competition ; Body mass ; Body fat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract At about age 5 years, colonies of the harvester ant, Pogonomyrmex barbatus, begin to produce winged, sexual forms (alates) that mate in large annual aggregations. We examined how colony age and neighborhood density affect the numbers, body mass, and body fat of alates produced by 172 colonies ranging in age from 4 to 17 years. Over one-third (36%) of all colonies produced no alates. Failure to reproduce was independent of colony age. Of those colonies that did produce alates, older colonies produced more alates than younger colonies. Older colonies produced lighter female alates (in dry mass), but the total biomass of additional alates produced by older colonies far outweighed the reduced allocation to female alate body mass. Body fat content was much higher in female alates (36.0% on average) than in males (3.7% on average). Alate body fat content was not related to colony age. The fitness of female alates may be related to their fresh body mass; that of females captured after mating and reared in the laboratory was positively correlated with egg-laying rate, although not with the total number of eggs in the first brood. Neighborhood density was not related to alate number, mass, or fat content, in contrast to the results of a 1995 study at the site, in which alate numbers were negatively related to neighborhood density. Thus the influence of crowding on reproductive output appears to vary from year to year, perhaps in response to variation in rainfall and food supply. Alate output by individual colonies was correlated among years. These results suggest that a few, older colonies dominate the pool of reproductives year after year.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004420050774
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  • 10
    Electronic Resource
    Electronic Resource
    Exploitation and interference competition between the invasive Argentine ant, Linepithema humile, and native ant species (1996)
    Springer
    Oecologia 105 (1996), S. 405-412 
    Details
    ISSN: 1432-1939
    Keywords: Exploitation ; Interference ; Competition ; Argentine ant ; Invasion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Interactions between the invasive Argentine ant, Linepithema humile, and native ant species were studied in a 450-ha biological reserve in northern California. Along the edges of the invasion, the presence of Argentine ants significantly reduced the foraging success of native ant species, and vice versa. Argentine ants were consistently better than native ants at exploiting food sources: Argentine ants found and recruited to bait more consistently and in higher numbers than native ant species, and they foraged for longer periods throughout the day. Native ants and Argentine ants frequently fought when they recruited to the same bait, and native ant species were displaced from bait during 60% of these encounters. In introduction experiments, Argentine ants interfered with the foraging of native ant species, and prevented the establishment of new colonies of native ant species by preying upon winged native ant queens. The Argentine ants' range within the preserve expanded by 12 ha between May 1993 and May 1994, and 13 between September 1993 and September 1994, with a corresponding reduction of the range of native ant species. Although some native ants persist locally at the edges of the invasion of Argentine ants, most eventually disappear from invaded areas. Both interference and exploitation competition appear to be important in the displacement of native ant species from areas invaded by Argentine ants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00328744
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