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  • 1
    Electronic Resource
    Electronic Resource
    Sull'attivita' di foraggiamento notturna delCamponotus nylanderi Em. (1965)
    Springer
    Insectes sociaux 12 (1965), S. 253-263 
    Details
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé L'auteur a observé en laboratoire l'activité de récolte des ouvrières deCamponotus nylanderi Em. Au moyen d'observations régulières sur de petites colonies provenant de la Sicile, on prouve que l'activité en question est exclusivement nocturne au moins pendant l'été. Ce rythme d'activité persiste pendant quelques jours en conditions d'éclairage continu et de température irrégulièrement variable.C. nylanderi, est la seule espèce de la myrmecofaune italienne ayant une activité de récolte exclusivement nocturne: c'est un trait de comportement qu'on trouve seulement chez les espèces deCamponotus des déserts chauds, systématiquement voisines deC. nylanderi.
    Abstract: Zusammenfassung Der Verfasser studiert die Sammeltätigkeit der Arbeiterinnen desCamponotus nylanderi Em. Nach systematischer Beobachtung einiger Kolonien, die aus Sizilien stammen, beweist der Verf. dass die sommerliche Sammeltätigkeit ausschliesslich in der Nacht vorsichgeht. Im Herbst kann man auch während des Tages eine geringe Tätigkeit beobachten. Im Dauerlicht (unter uregelmässig wechselnder Temperatur) ist es möglich den Tätigkeitsrhytmus noch für einige Tage zu verfolgen.C. nylanderi ist die einzige Art des italienischen Ameisenfauna, bei der man eine solche nächtliche Aktivität vorfindet. Ein solches Verhalten kommt nur bei verwandtenCamponotus-arten vor, die die warmen Wüsten bewohnen.
    Notes: Riassunto L'Autore, dopo una rivista delle attuali conoscenze sui ritmi di attività delle formiche, studia l'attività di foraggiamento delCamponotus nylanderi Em. e segnala come, almeno nel periodo estivo, essa sia esclusivamente notturna con due massimi di attività (attorno alle ore 21 ed alle ore 2) nella prima e nella seconda metà della notte. In autunno, seppure molto ridotta, l'attività persiste anche nelle ore diurne. In luce costante (e temperatura irregolarmente variabile), l'attività periodica perdura ancora quattro o cinque giorni per poi divenire completamente aritmica. Un'attività notturna quale quella qui illustrata riveste un particolare interesse per la sua unicità in tutta la fauna mirmecologica italiana e per l'analogia che presenta con quella di alcuni affiniCamponotus tropicali.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02223895
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  • 2
    Electronic Resource
    Electronic Resource
    Heinrich Kutter (1896–1990) (1991)
    Springer
    Insectes sociaux 38 (1991), S. 217-218 
    Details
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01240972
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  • 3
    Electronic Resource
    Electronic Resource
    The Balzan Prize 1989 to Leo Pardi (1990)
    Springer
    Insectes sociaux 37 (1990), S. 268-269 
    Details
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02224054
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  • 4
    Electronic Resource
    Electronic Resource
    Ulteriori osservazioni ed esperienze sulla monoginia dei Formicidi: Saggio di un'analisi del comportamento inLeptothorax exilis Em. (1966)
    Springer
    Insectes sociaux 13 (1966), S. 173-183 
    Details
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé L'auteur résume les connaissances actuelles sur la monogynie des fourmis et discute l'opportunité d'adopter ce terme au lieu des autres préexistants dans la littérature. Il rapporte en outre quelques expériences qui lui permettent de conclure queLeptothorax exilis Em. est une espèce monogyne et que cette condition, en cas de fusion entre jeunes colonies, est assurée par l'intervention des ouvrières. L'hostilité des ouvrières contre les reines étrangères ne peut pas être expliquée par la seule diversité de l'odeur caractéristique du nid et est strictement liée à la présence de la reine mère ou même seulement à celle de morceaux de son cadavre. On fournit enfin un schéma des différentes méthodes avec lesquelles les fourmis assurent la monogynie de la colonie.
    Abstract: Summary The autor summarizes present knowledge about the monogyny of Formicidae and considers the appropriateness of this term in preference to those hitherto in use. The A. also reports some experiences that lead to the conclusion thatLeptothorax exilis Em. is a monogynic species, a condition which in case of the fusion of young colonies is assured by the intervention of the workers. The aggressive behaviour of the workers toward foreign queens cannot be explained solely by the diversity of the odor characteristic of each colony. It is also in direct relationship with the presence of the queen mother or even just her corpse. The A. outlines the various methods by which ants assure the monogyny of the colony.
    Notes: Riassunto L'autore riassume le attuali conoscenze sulla monoginia dei formicidi e discute dell'opportunità di adottare questo termine in luogo di altri preesistenti nella letteratura. Vengono inoltre riferite alcune esperienze in base alle quali è lecito concludere che ilLeptothorax exilis Em. è specie monogina e che questa condizione, nel caso di fusione tra colonie giovani, è assicurata dall'intervento delle operaie. L'aggressività delle operaie nei confronti delle regine estranee non può essere spiegata solo in base alla diversità dell'odore caratteristico del formicaio ed è in stretta correlazione con la presenza della regina madre od anche solo del suo cadavere. Vengono inoltre schematizzati i diversi metodi con cui le formiche si assicurano la monoginia della colonia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02223023
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  • 5
    Electronic Resource
    Electronic Resource
    Origin of ant soldiers (1996)
    [s.l.] : Nature Publishing Group
    Nature 383 (1996), S. 223-223 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR—For more than 100 years, biologists have believed that ant social organization required an infertile worker caste from which, in some species, a special subcaste of soldiers had been selected. Here we suggest that ant soldiers form a distinct caste which originated directly from ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/383223a0
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  • 6
    Electronic Resource
    Electronic Resource
    A statistical table for the degree of coexistence between two species (1979)
    Springer
    Oecologia 44 (1979), S. 287-289 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The well known Jaccard's association coefficient has been calculated on perfectly random infinite samples of different n size and a statistical table with the corresponding probability values is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00545229
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  • 7
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    A statistical table for the degree of coexistence between two species (1979)
    Springer
    Details
    Publication Date: 1979-01-01
    Print ISSN: 0029-8549
    Electronic ISSN: 1432-1939
    Topics: Biology
    Published by Springer
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  • 8
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    Origin of ant soldiers (1996)
    Springer Nature
    Details
    Publication Date: 1996-09-01
    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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