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  • Camponotus pennsylvanicus  (2)
  • Calcium  (1)
  • compound eye  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 4 (1969), S. 180-184 
    ISSN: 1432-0827
    Keywords: Strontium ; Calcium ; Bone ; Shell
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Description / Table of Contents: Résumé Des poules ont été nourries avec une alimentation riche en strontium stable. Des concentrations de strontium de 3000 p.p. m. à 50000 p.p.m. montre une augmentation nette en strontium du tibia, alors que le contenu en calcium n'est pas modifié. Les concentrations en calcium sérique diminue, lorsque le strontium alimentaire augmente. Le calcium des coquilles d'oeufs diminue progressivement avec l'augmentation du strontium alimentaire, alors que le contenu en strontium des coquilles présente une augmentation correspondante. Des analyses de diffraction par rayons X des os et des coquilles ne permettent pas de déterminer sous quelle forme le strontium est déposé.
    Abstract: Zusammenfassung Die Resultate einer Verfütterung von hohen stabilen Strontiumdosen an Hühnern werden erläutert. Strontiumzusätze zur Nahrung in der Höhe von 3000–50000 p.p.m. führten zu einer signifikanten Zunahme des Strontiumgehaltes der Tibia und verursachten keine wesentlichen Änderungen des Calciumgehaltes. Die Calciumkonzentration im Plasma verminderte sich, wenn der Nahrung ansteigende Strontiummengen zugegeben wurden. Mit zunehmendem Strontiumzusatz zur Nahrung zeigte der Calciumgehalt der Eischale eine fortlaufende Abnahme, während sich der Strontiumgehalt entsprechend erhöhte. Durch Röntgendiffraktionsanalysen der stark Strontium-haltigen Knochen und Eischalen konnte nicht festgestellt werden, in welcher Form das Strontium abgelagert wurde.
    Notes: Abstract The results of feeding high dietary levels of stable strontium to hens are reported. Dietary levels of strontium from 3,000 p.p.m. to 50,000 p.p.m. showed a significant increase in strontium content of the tibia bone and essentially no change in the calcium content. Plasma calcium concentration was shown to decrease with increasing dietary strontium treatment. Egg shell calcium showed a progressive decrease with increasing dietary strontium treatment, whereas the strontium content has a corresponding increase. X-ray diffraction analyses of bones and shells containing large amounts of strontium were unsuccessful in evaluating the from in which strontium was deposited.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1420-9098
    Keywords: Camponotus pennsylvanicus ; compound eye ; ommatidia number ; Polymorphism ; caste development
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The relation of worker size to ommatidia number was examined in the polymorphic antCamponotus pennsylvanicus (DeGeer). Linear regression described this relationship as:Y = 260.9 + 113.6×; whereYis ommatidia number andX is head width. A log-log regression described this relationship as:Y = 323.5 + 286.9*logX(r 2 = 0.98). This analysis indicated an allometric relation of ommatidia number to head width, where ommatidia numbers increase at a slower rate than head width. This relationship is discussed in terms of ethotypes associated with worker morphotypes, and the possible mechanisms regulating polymorphic development.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1572-8889
    Keywords: Insecta ; Camponotus pennsylvanicus ; Tapinoma sessile ; structural guideline orientation ; orientation cues
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Camponotus pennsylvanicus(DeGeer) and Tapinoma sessile(Say) exploit structural elements as guide-lines in their topographic orientation. This research documents the response of T. sessileand C. pennsylvanicusto a series of thigmotactic, gravitational, chemotactic, and phototactic cues while utilizing structural guidelines. Adherence to these guidelines is more pronounced on vertical than on horizontal surfaces and more pronounced in darkness than in daylight. Orientation switches from a crestline on the horizontal to a groove on the vertical. Light and odor trails serve an important role as distance cues in structural guideline orientation. The hierarchy of orientation cues and the adaptive significance of these ant's exploitation of structural guidelines are discussed.
    Type of Medium: Electronic Resource
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