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Annual Cycles in Worker Size of the Seed-Harvester Ant Veromessor pergandei (Hymenoptera: Formicidae)

Rissing, Steven W.

Behavioral ecology and sociobiology, 1987-01, Vol.20 (2), p.117-124 [Periódico revisado por pares]

Heidelberg: Springer-Verlag

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  • Título:
    Annual Cycles in Worker Size of the Seed-Harvester Ant Veromessor pergandei (Hymenoptera: Formicidae)
  • Autor: Rissing, Steven W.
  • Assuntos: Animal nesting ; Ants ; Biological and medical sciences ; Body size ; Desert insects ; Foraging ; Formicidae ; Fundamental and applied biological sciences. Psychology ; Insect behavior ; Insect castes ; Insect colonies ; Insecta ; Invertebrates ; Morphology. Histology. Cytology ; Social insects ; Worker insects
  • É parte de: Behavioral ecology and sociobiology, 1987-01, Vol.20 (2), p.117-124
  • Notas: ObjectType-Article-2
    SourceType-Scholarly Journals-1
    ObjectType-Feature-1
    content type line 23
  • Descrição: The seed-harvester ant Veromessor pergandei Mayr is primitively polymorphic; workers are monophasically allometric. There is a distinct annual cycle in mean worker body size that replicates across colonies and habitats (Fig. 1); this cycle occurs through alteration of the worker size distribution (Fig. 2). There is little, if any, morph-specific task specialization by workers suggesting worker size variance is a colony-level adaptation permitting maintenance of a large and constant worker force during periods of resource fluctuation. Smaller workers appear in the foraging force following the "triple crunch" of reduced seed availability, reduced favorable times to forage, and alate production during winter months. Adult and starting V. pergandei colonies exhibit strong intraspecific territoriality, suggesting the selective advantage for maintenance of a large and constant worker force. Such selective pressures may have provided the initial variance in worker size distributions that led subsequently to specialized caste-specific task performance in more distinctly polymorphic ant species.
  • Editor: Heidelberg: Springer-Verlag
  • Idioma: Inglês
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