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  • Canadian Science Publishing  (3)
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  • Canadian Science Publishing  (3)
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  • 1
    Online-Ressource
    Online-Ressource
    Étude cinématique de la palette natatoire antérieure de la tortue Luth, Dermochelys coriacea (Vandelli, 1761), au cours de sa locomotion terrestre
    Canadian Science Publishing ; 1991
    In:  Canadian Journal of Zoology Vol. 69, No. 2 ( 1991-02-01), p. 495-503
    Details
    In: Canadian Journal of Zoology, Canadian Science Publishing, Vol. 69, No. 2 ( 1991-02-01), p. 495-503
    Kurzfassung: The leatherback turtle, Dermochelys coriacea, which is particularly well adapted to marine life, uses a mode of terrestrial locomotion that does not involve raising the entire body; it drags itself instead, which is unique to heavy animals. The primary pattern of tetrapods, using alternate movements and a diagonal sequence of the limbs, is replaced by a specific repertory of periodic and synchronous movements of the fore- and hind-limbs. The forelimbs, which have evolved into large paddles, produce lifting and forward movements of the body as if the turtle were "walking on crutches." During terrestrial locomotion, the forelimb movement, derived from swimming, is rather similar to that used during vigorous swimming, except for a reduction of the upstroke.
    Materialart: Online-Ressource
    ISSN: 0008-4301 , 1480-3283
    URL: Article
    DOI: 10.1139/z91-076
    RVK:
    WA 15000
    Sprache: Englisch
    Verlag: Canadian Science Publishing
    Publikationsdatum: 1991
    ZDB Id: 1490831-1
    SSG: 12
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 2
    Online-Ressource
    Online-Ressource
    Kinematic analysis of tongue movements during chemosensory behaviour in the European green lizard, Lacerta viridis (Reptilia: Lacertidae)
    Canadian Science Publishing ; 1992
    In:  Canadian Journal of Zoology Vol. 70, No. 10 ( 1992-10-01), p. 1886-1896
    Details
    In: Canadian Journal of Zoology, Canadian Science Publishing, Vol. 70, No. 10 ( 1992-10-01), p. 1886-1896
    Kurzfassung: High-speed cinematography (100 frames/s) was used to allow quantitative analysis of the kinematic profiles of tongue and jaw displacements during chemosensory activities in the scleroglossan lizard Lacerta viridis. The types of tongue flicking were simple downward extensions (SDE), single oscillations (SOC), and submultiple oscillations (SMOC) of the tongue out of the mouth. The SMOC type involves a downward or upward movement of the tongue performed before a typical oscillation and it is therefore suggested that this is an intermediate category of flick between the typical SOC and MOC of lizards. Closing and opening of the mouth in SDE, SOC, and SMOC cycles may or may not be separated by a stationary stage during which the jaws are held open at a constant gape. The duration of this stationary interval increases from SDE to SMOC. Gape cycles do not show any division into slow and fast stages. The gape is produced largely by depression of the lower jaw; the upper jaw is slightly elevated by protrusion of the tongue. Patterns of correlation of kinematic variables depicting jaw and tongue movements differed between SDE, SOC, and SMOC. A principal component analysis shows that the three flick types overlap in a multivariate space constructed from the kinematic variables depicting jaw and tongue displacements. Overlap between SOC and SMOC categories is greater than that between SOC, SMOC, and SDE categories. The kinematic patterns of tongue displacement during SMOC in Lacerta viridis show similarities with those of MOC in other lizards and in snakes. Kinematically, the pattern of jaw and tongue displacements of Lacerta viridis during chemosensory activities shows similarities with those that occur during drinking and prey capture.
    Materialart: Online-Ressource
    ISSN: 0008-4301 , 1480-3283
    URL: Article
    DOI: 10.1139/z92-257
    RVK:
    WA 15000
    Sprache: Englisch
    Verlag: Canadian Science Publishing
    Publikationsdatum: 1992
    ZDB Id: 1490831-1
    SSG: 12
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 3
    Online-Ressource
    Online-Ressource
    Quantitative analysis of prey-capture kinematics in Anolis equestris (Reptilia: Iguanidae)
    Canadian Science Publishing ; 1990
    In:  Canadian Journal of Zoology Vol. 68, No. 10 ( 1990-10-01), p. 2192-2198
    Details
    In: Canadian Journal of Zoology, Canadian Science Publishing, Vol. 68, No. 10 ( 1990-10-01), p. 2192-2198
    Kurzfassung: High-speed cinematography was employed to study the mechanics of prey capture in Anolis equestris. Capture of live prey (adult locusts) consists of a cyclic movement of the upper and lower jaws combined with tongue protraction. Kinematic profiles are presented for the jaws, tongue, and forelimbs. The tongue is projected during the "slow open" stage and most of the "fast open" stage. The tongue protrudes beyond the mandibular symphysis during the slow open stage, and rotates simultaneously around a transverse anteromedian axis. The prey is thus contacted by the dorsal sticky surface of the tongue, and then pulled backward into the oral cavity by a combination of a forward movement of the jaws and retraction of the tongue. Gape angle, defined as the angle between the upper and lower jaws, continues to increase during the initial stages of tongue retraction. During the capture process, the anterior part of the body lunges forward, followed by a return to its original position; this displacement is mediated by the forelimbs, which usually remain well anchored to the floor. The cyclic food-capture movements of the jaws and tongue–hyoid system in A. equestris (Iguanidae) and Chameleo dilepis (Chamaeleontidae) are compared. I argue that one of the primary selection forces in the evolution of the different mechanisms of prey prehension in these two lizard groups was enhancement of the locomotor system and, consequently, foraging ability.
    Materialart: Online-Ressource
    ISSN: 0008-4301 , 1480-3283
    URL: Article
    DOI: 10.1139/z90-304
    RVK:
    WA 15000
    Sprache: Englisch
    Verlag: Canadian Science Publishing
    Publikationsdatum: 1990
    ZDB Id: 1490831-1
    SSG: 12
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Online-Ressource
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