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  • 1
    Electronic Resource
    Electronic Resource
    Variation of ommatidia number as a function of worker size inCamponotus pennsylvanicus (DeGeer) (Hymenoptera: Formicidae) (1992)
    Springer
    Insectes sociaux 39 (1992), S. 233-236 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF01249297
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The use of spatial cues for structural guideline orientation inTapinoma sessile andCamponotus pennsylvanicus (Hymenoptera: Formicidae) (1992)
    Springer
    Journal of insect behavior 5 (1992), S. 71-82 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF01049159
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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