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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
    Crest-line orientation inCamponotus pennsylvanicus (DeGeer) (1985)
    Springer
    Insectes sociaux 32 (1985), S. 305-312 
    Details
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Wir prüften zwei Erklärungsprinzipien für den Mechanismus des Gratwanderns bei der AmeiseCamponotus pennsylvanicus (DeGeer): (1) Nach der Reizhypothese wendet die Ameise bei einem kritischen Hangwinkel hangaufwärts (Geoklinotaxis). (2) Nack der Spontanhypothese pendelt die gratwandernde Ameise mit selbstbestimmer Amplitude beidseitig um den Grat. Im Experiment unter starker und schwacher Beleuchtung liefen die Ameisen über Zylinder variablen Durchmessers zwischen Nest und Futterstelle. Die beobachtete positive Korrelation zwischen der Pendelamplitude und dem Zylinderdurchmesser belegt die erste Hypothese.
    Notes: Summary We tested two hypotheses about the mechanism of crest-line trailing in the carpenter ant,Camponotus pennsylvanicus (DeGeer): (1) the slope hypothesis says that the ant turns back toward the crest-line whenever a critical downslope is encountered (geoclinotais); (2) the displacement hypothesis says that the oscillation around the crestline has an intrinsically specified amplitude. Inthe experiments, the ants shuttled between the nest and a feeding station running across the tops of cylinders of variable diameter. This was done under both high and low light intensity. The amplitudes of the oscillations correlate positively with the diameters of the cylindrical substrate, which supports the first hypothesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02224919
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Topographic orientation in two species of ants (Hymenoptera: Formicidae) (1987)
    Springer
    Insectes sociaux 34 (1987), S. 236-251 
    Details
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Die Topographische Orientierung zweier Ameisen-Arten wird verglichen. Zur Orientierung während des Tages verwenden die hauptsächlich nachts-aktive Art,Camponotus pennsylvanicus, und die hauptsächlich tags-aktive Art,Formica subsericae, verschiedene Eigenschaften der Umwelt. Untersuchungen im Freiland zeigen, dass beide Arten Himmels-und Grezstein-Orientierung besitzen. Obwohl beide Arten auf visuelle Eigenschaften bzw. Duftspuren reagieren, spielen beiF. subsericea die ersterwähnten eine wichtigere Rolle; und beiC. pennsylvanicus ist es umgekehrt. Diese Orientierungsunterschiede werden mit Bezug auf die Verhaltensökologie der beiden Arten diskutiert.
    Notes: Summary The topographic orientation of two species of ants is compared. Differential cue emphasis exists in diurnal orientation between the primarily nocturnalCamponotus pennsylvanicus and the mainly diurnalFormica subsericea. Field experiments demonstrated that both species use celestial and landmark cues for orientation. Although both species use visual cues and odor trails, forF. subsericea the former serve a more important role and vice versa forC. pennsylvanicus. The importance of these orientational differences is discussed in relation to the behavioral ecology of each species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02224356
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Nocturnal orientation in the black carpenter antCamponotus pennsylvanicus (DeGeer) (Hymenoptera: Formicidae) (1993)
    Springer
    Insectes sociaux 40 (1993), S. 95-106 
    Details
    ISSN: 1420-9098
    Keywords: Nocturnal orientation ; canopy orientation ; structural guidelines ; Camponotus pennsyhanicus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The black carpenter antCamponotus pennsylvanicus (DeGeer), a predominantly nocturnal Formicine ant, responds to a hierarchy of visual and tactile cues when orienting along odor trails at night. Under illumination from moonlight or artificial light, workers rely upon these beacons to mediate phototactic orientation. In the absence of moonlight or artificial lights, ants were able to orient visually to terrestrial landmarks. In the absence of all landmarks, save for overhanging tree branches, ants could negotiate shortcuts or make directional changes in response to visual landmarks presented within the tree canopy on a moonless night. When experimental manipulations placed the ants in total darkness, they could no longer negotiate shortcuts and would resort to thigmotactic orientation along structural guidelines to reach a food source. The hierachical organization of these diverse cues in a foraging strategy is discussed, as well as their adaptive significance toC. pennsyhanicus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01338835
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    Paper (German National Licenses)
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  • 5
    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
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    Paper (German National Licenses)
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