Le probleme Velou c'est que je voudrais faire un clad mais en format image pour populus sinon tu vois se que ca donne sur mon site. Je vais essayer d'empreinter le logiciel pour faire les clad; celui dont mark m'a parler.

mais pas la peine, c'est ce que je t'explique, je sais faire des clados-images !!!

Du nouveau pour tes chouchous Velou :

PER CHRISTIANSEN (2007) Comparative bite forces and canine bending strength in feline and sabretooth felids: implications for predatory ecology. Zoological Journal of the Linnean Society 151 (2), 423-437

The sabretooth felids were widespread across much of the world in the Late Tertiary, and appear to have been an important group of large predators. Owing to the substantially different skull morphology of derived sabretooths compared with extant felids, there has been considerable debate over the killing mode, bite forces, and bending strength of the large upper canines, and over the implications of these characteristics on feeding ecology. Debates have, however, usually been based on indirect comparisons of force vectors. In this paper, I provide assessments of the estimated force output from the jaw adductor muscles, based on estimates of muscle cross-sectional areas and force vectors, along with canine bending strengths, in a variety of sabretooth felids, in comparison with extant felids. In general, sabretoothed felids had moderately powerful bites, albeit with less jaw adductor power for their body sizes compared with extant felids, sometimes markedly so. Less derived sabrecats appear to have had proportionally higher bite forces than derived forms. The length of the upper canines seemingly compromised their bending strength at any given body size, and again this was most marked in derived forms. However, compared with estimated jaw adductor forces, the canines of sabrecats appear, if anything, to have been stronger than those of extant conical-toothed felids. It has previously been suggested that large sabretoothed felids hunted large prey with a canine shearing bite, powered in part by the jaw adductors and in part by the muscles of the upper neck-occipital region. The present results of canine bending strengths versus the predicted bite force from the jaw adductors supports this suggestion.

Et aussi ça :

McHenry, C.R., Wroe, S., Clausen, P.D., Moreno, K., and Cunningham, E., S. 2007. Supermodeled sabercat, predatory behavior in Smilodon fatalis revealed by high-resolution 3D computer simulation. Proceedings of the National Academy of Sciences 104(41):16010-16015

The American sabercat Smilodon fatalis is among the most charismatic of fossil carnivores. Despite broad agreement that its extraordinary anatomy reflects unique hunting techniques, after >150 years of study, many questions remain concerning its predatory behavior. Were the "sabers" used to take down large prey? Were prey killed with an eviscerating bite to the abdomen? Was its bite powerful or weak compared with that of modern big cats? Here we quantitatively assess the sabercat's biomechanical performance using the most detailed computer reconstructions yet developed for the vertebrate skull. Our results demonstrate that bite force driven by jaw muscles was relatively weak in S. fatalis, one-third that of a lion (Panthera leo) of comparable size, and its skull was poorly optimized to resist the extrinsic loadings generated by struggling prey. Its skull is better optimized for bites on restrained prey where the bite is augmented by force from the cervical musculature. We conclude that prey were brought to ground and restrained before a killing bite, driven in large part by powerful cervical musculature. Because large prey is easier to restrain if its head is secured, the killing bite was most likely directed to the neck. We suggest that the more powerful jaw muscles of P. leo may be required for extended, asphyxiating bites and that the relatively low bite forces in S. fatalis might reflect its ability to kill large prey more quickly, avoiding the need for prolonged bites.

Merci Tiké

ben je relis et je remarque que j'ai dit un peu de m....

Les premiers Panthera sont originaires d'Afrique, comme je l'ai dit, mais le lion des cavernes n'est pas du tout l'ancêtre du tigre, je pensait ça à l'époque, mais c'est FAUX lol

quand au lion de Sibérie orientale (ou plutot lion de Béringie c'est plus correcte car cette forme a aussi été retrouvé en Alaska et au Yukon) il s'agirait simplement d'une 'forme naine' et ce n'est pas la peine de l'érigé au rang de sous-espèce.

Je n'arrive tjrs pas à avoir sa publi, si quelqu'un l'a, un petit dernier espoir :

G. Baryshnikov and G. Boeskorov (2001). The Pleistocene cave lion, Panthera spelaea (Carnivora : Felidae) from Yakutia, Russia.

sinon tant pis lol

Je ne la trouve pas non plus...

Salut velou,

J'ai pas trouvé la ref mais une autre :
- Marina Sotnikova
, Pavel Nikolskiy. Systematic position of the cave lion Panthera spelaea (Goldfuss) basedon cranial andd ental characters. Quaternary International 142–143 (2006) 218–228.

pis :
Dietrich 2007. Upper pleistocène P. leo spelaea skeleton from Praha-Podbaba and other lion finds from loess and river terrace sites in Central Bohemia. Null geociences 82(2)

-Nagel & al 2003. Functional morphology and fur patterns in recent and fossil panthera species. Scripta geologica 126, nov 2003.

ça t'intéresse?