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A morphological study of larval development in polymorphic all-worker broods of the army antEciton burchelli (1, 2)

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Résumé

L'étude de l'anatomie, interne et externe, des larves d'un couvain polymorphe “all-worker” d'Eciton burchelli indique que, malgré le manque de différences significatives entre les structures globales ou partielles des individus appartenant aux divers groupes polymorphes, il existe des différences importantes dans la courbe de croissance parmi les individus des populations polymorphes. Des différences dues à la caste se manifestent lors de l'apparition des structures externes telles que les pièces buccales et les disques imaginaux des antennes, des pattes et des gonopodes. Des différences se manifestent également par des structures internes telles que le tube digestif, les tubes de Malpighi, le système nerveux, les glandes labiales par exemple. En considérant une série complète du couvain entier prise à n'importe quel moment de la phase de développement, on a trouvé que les individus les plus gros étaient les plus avancés, ceux de volume moyen étaient moins avancés, et ceux de petit volume étaient les moins avancés.

Les résultats d'une étude détaillée du développement des disques imaginaux des pattes et des changements cytologiques se produisant dans les glandes labiales indiquent que les structures de développent le plus lentement dans les larves les plus grosses, un peu plus rapidement dans les larves de volume intermédiaire et le plus rapidement dans les larves les plus petites.

Les résultats d'une étude détaillée de l'ontogenèse des glandes labiales, considérées en rapport avec leurs fonctions de glandes salivaires et de glandes séricigènes, confirment les conclusions deSchneirla acquises au cours d'enquêtes antérieures au sujet du rôle important des propriétés stimulantes et trophiques du couvain larvaire dans le comportement global de la colonie.

Zusammenfassung

Untersuchungen der inneren und ausseren Anatomie von polymorphen “All-worker” Larven desEciton burchelli Stammes zeigen keine erkennbaren Unterschiede qualitativer Art in der allgemeinen oder Einzelstruktur zwischen den verschiedenen Grössenklassen, hingegen konstante Unterschiede in der relative Wachstumsgeschwindigkeit.

Zur Zeit des Auftretens äusserer Strukturen wie Mundteile, Antennensprossen (scheiben) und imaginaerer Beinsprossen (scheiben), ebenso innerer Strukturen wie Labialdrüsen weisen die Gruppen Unterschiede auf.

Betrachtung einer gesamten Zucht zu einem beliebigen Zeitpunkt innerhalb der Entwicklungsphase zeigte, dass Individuen der höchtsten Grössenklasse am Weitesten fortgeschritten waren, Individuen von mittlerer Grösse etwas weniger entwickelt und solche von der geringsten Gesamtgrösse den geringsten Fortschritt aufwiesen.

Einzeluntersuchungen über die Entwicklung imaginärer Beinknospen und über die cytologischen Veränderungen in den Labialdrüsen zeigen, dass diese Strukturen sich am langsamste in den grössten Larven entwickeln, etwas schneller in der mittleren Grössenklasse und am raschesten in den kleinsten Larven.

Im Rahmen dieser Arbeit wurde eine Untersuchung der Entwicklungs-geschichte der Labialdriisen in Bezug auf ihre Bedeutung für Speicheldrüsen und Spinndrüsenfunktionen durchgeführt, es zeigte sich, dass vonSchneirla auf Grund früherer Untersuchungen gezogene Schlüsse, die bedeutsame Rolle der stimulierenden und trophischen Fähigkeiten der Larvenzucht für das Kolonieverhalb betreffen, bestätigt werden können.

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This paper represents in part a dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Department of Biology at Fordham University.

The writer wishes to acknowledge the guidance and encouragement of Dr. James Forbes, Associate Professor of Biology at Fordham University, her doctoral sponsor, and of Dr. T. C. Schneirla, Curator, Department of Animal Behavior, American Museum of Natural History, in whose laboratory the work was mainly carried out. The study was supported under contract 161–465 between the Office of Naval Research and the American Museum of Natural History, and through a grant from the National Science Foundation to Dr. Schneirla in support of the research program under which this investigation was made.

The assistance of the Division of Photography at the American Museum is acknowledged with thanks, and the writer also appreciates the many kindnesses extended her by other members of the Museum staff in connection with the project.

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Lappano, E.R. A morphological study of larval development in polymorphic all-worker broods of the army antEciton burchelli (1, 2). Ins. Soc 5, 31–66 (1958). https://doi.org/10.1007/BF02222428

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Keywords

  • Morphological Study
  • Larval Development
  • Parmi
  • Tube Digestif
  • Changements Cytologiques