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Las Hoyas tetrapod growth rates



From: Ben Creisler
bh480@scn.org

A new paper:


Alida Bailleul, Loïc Ségalen, Angela D. Buscalioni, Oscar Cambra-Moo and
Jorge Cubo (2011) 
Palaeohistology and preservation of tetrapods from Las Hoyas (Lower
Cretaceous, Spain). 
Comptes Rendus Palevol (advance online publication)
doi:10.1016/j.crpv.2011.05.002 
http://www.sciencedirect.com/science/article/pii/S1631068311000996

Abstract
The Upper Barremian (Lower Cretaceous) site of Las Hoyas (Spain) is an
important Konservat Lagerstätte that has a yielded well-preserved biota.
Both the palaeohistology and the preservation of six tetrapods were
investigated in this study. Chemical analysis (Ca/P ratio, fluorine,
strontium, barium and REE amounts) reveals an alteration of the original
apatite of the bone in fluoroapatite by postmortem substitutions, a late Sr
incorporation during fossilization, and a rather moderate postmortem REE
incorporation in the freshwater environment of Las Hoyas. However, the
conditions of fossilization have limited the dissolution-recrystallisation
processes and preserved the microstructure of the bones. Bone growth rate
estimations have been made according to Amprino's rule. The Discoglossidae
indet, the Centrocryptodira indet. and Scandensia ciervensis are
characterized by low growth rates and an ectothermic metabolism. Concornis
lacustris, Pelecanimimus polyodon and the Archosauria indet. are
characterized by a faster growth and probably higher resting metabolic
rate. All of the specimens are adults of small-sized species. This leads to
the hypothesis of an ecological filter favoring small-sized species in this
ecosystem, strengthening the taphonomical results. The combination of
geochemical and histological studies seems to offer a more precise overlook
of life history traits and preservation of these fossils from Las Hoyas.


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