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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Insectes sociaux 33 (1986), S. 85-99 
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Freiland- und Laboratoriumsuntersuchungen einer Kolonie vonMyrmoteras toro, die im Central Sulawesi gesammelt wurde, und einerM. barbouri Kolonie von Singapore, lieferten die ersten ökologischen und verhaltensbiologischen Informationen über diese wenig bekannte Gattung der Unterfamilie Formicinae. Die Arbeiter jagen einzeln und fangen mit ihren langen Schnapp-Kiefern kleine weiche Evertebraten, ähnlich wie es von Arten der Dacetini und Odontomachini bekannt ist. Bevor die Jägerinnen zuschnappen öffnen sie Kiefer um 280°. Das ist der grösste Mandibel-Offnungswinkel, der bisher von Ameisen bekannt ist. Bei der Nestverteidigung werden Eindringlinge häufig mit den Mandibeln gestossen. M. toro jagt kleine, weiche Arthropoden, währendM. barbouri nahezu ausschliesslich Springschänze fängt. Ich nehme an, dass die Trigger-Haare, die typisch fürM. barbouri und andere Arten der UntergattungMyrmoteras sind, eine spezielle Anpassung für das Collembolenjagen sind. Rekrutierung zu Futter und Nestplätzen scheint nicht vorzukommen.
    Notes: Summary Field and laboratory studies on a colony ofMyrmoteras toro collected in Central Sulawesi and aM. barbouri colony from Singapore have provided the first ecological and behavioral information on this enigmatic formicine genus. Both species capture prey singly by the trap-jaw method, much as do many dacetine and odontomachine ants. Before striking the ants open their jaws 280°, the greatest degree yet recorded in the ants. Also, the nest area is defended from encroachment by other invertebrates by slapping intruders repeatedly with the mandibles. M. toro workers catch a variety of small, soft-bodied arthropods.M. barbouri preys largely or entirely on springtails. I hypothesize that the trigger hairs characteristic ofM. barbouri and other species of the subgenusMyrmoteras could represent an adaptation to collembolan prey. Recruitment to food (sugar baits) and during emigrations appears to be absent.
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Insectes sociaux 33 (1986), S. 444-457 
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung 1. Morphologische Belege legen den Schluss nahe, dass die südostasiatische Ameisengattungproatta phylogenetisch der Tribus Attini nahe steht. Die Königin vonProatta wird erstmals beschrieben. 2. Kolonien vonProatta butteli sind polygn. Aggression zwischen den Königinnen oder unterschiedliches Verhalten der Arbeiterinnen zu bestimmten Königinnen konnte nicht beobachtet werden. Intraspezifische Aggression scheint nicht zu existieren: die Ameisen können leicht zwischen entfernten Nestern ausgetauscht werden. 3. Arbeiter gehen einzeln auf Futtersuche; sie entfernen sich dabei kaum weiter als 1 Meter vom Nesteingang. Innerhalb des begrenzten Fouragierbereiches ist die Arbeiterdichte oft beträchtlich; bisweilen findet man bis zu 50 Futtersucher an einem Fleck. Dieses Fouragierverhalten ermöglicht eine schnelle Ausbeutung von Futterquellen. Mit Hilfe von Spurpheromonen, die aus der Giftdrüse stammen, werden Nestgenossen rekrutiert. 4. Meist erbeuten die Ameisen kleine Beuteobjekte, doch manchmal werden auch Beutetiere, die grösser als die Ameisen sind, gefangen. Dies geschieht durch ein einfaches, kooperatives Beuteverhalten. Anders als Arten der Tribus Attini ernährt sichProatta butteli nicht von Pilzen. 5. Das Verhaltensrepertoire, Arbeitsteilung und Emigrationsverhalten werden diskutiert. Obgleich die Arbeiterinnen nur wenig in der Kopfkapselbreite variieren (0.51 bis 0.70 mm), zeigen sie doch eine gewisse grössenabhängige Arbeitsteilung, wobei die kleineren Individuen häufiger im Brutnest vorkommen.
    Notes: Summary 1. Morphological evidence indicates the Southeast Asian genusProatta is phylogenetically close to the Attini. The gyne ofProatta is described for the first time. 2. Colonies ofProtta butteli are polygynous, with numerous queens present. There is no evidence for aggression between queens or differential treatment of queens by workers. Also, there is no sign of intraspecific aggression: the ants readily accepted workers transplanted from distant sites. 3. Workers search for food solitarity, foraging only a short distance (invariably less than a meter) from each nest entrance. Within the limited foraging area worker density tends to be high, and clumps of as many as 50 foragers are sometimes present. This foraging pattern allows for rapid exploitation of discovered food. Recruitment occurs along odor trails formed from a pheromone originating in the poison gland. 4. In addition to small prey and scavenged arthropod corpses, the ants capture prey larger than themselves. Such prey are taken by an inchoate form of group predation. The first worker to encounter the prey attempts to restrain it. Because of the high forager density, additional workers soon arrive seemingly by chance and aid in pinning the prey in place. Unlike attine ants,Proatta butteli does not feed on fungi. 5. The worker repertoire, temporal division of labor, and emigration behavior are discussed. Although workers vary little in head width (0.51 to 0.70 mm) they show a modest division of labor by size, with smaller individuals being relatively numerous in the brood area.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 71 (1984), S. 588-590 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 74 (1987), S. 551-553 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 50 (1994), S. 850-852 
    ISSN: 1420-9071
    Keywords: Recruitment ; trails ; pheromone ; foraging ; Leptothorax ; Nesomyrmex ; ant
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Leptothorax (Nesomyrmex) spininodis andL. (N.) echinatinodis workers lay pheromone trails when returning from food sources to their nests. Workers from within the nest begin following the trail almost immediately upon the successful forager's return and do not require a leader. The trail remains effective for about four minutes under our laboratory conditions but it is unclear whether the trail alone is sufficient to induce recruitment or whether additional signals, perhaps emitted within the nest, are involved. Pheromone trails of this type have not previously been documented for leptothoracine ants.
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  • 6
    Publication Date: 1994-09-01
    Print ISSN: 0014-4754
    Topics: Biology , Medicine
    Published by Springer
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  • 7
    Publication Date: 2012-04-20
    Print ISSN: 1045-2249
    Electronic ISSN: 1465-7279
    Topics: Biology
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  • 8
    Publication Date: 1987-11-01
    Print ISSN: 0028-1042
    Electronic ISSN: 1432-1904
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Published by Springer
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  • 9
    Publication Date: 1984-11-01
    Print ISSN: 0028-1042
    Electronic ISSN: 1432-1904
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Published by Springer
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