%0 Journal Article
%A Gómez Cano, Ana Rosa
%A Hernández Fernández, Manuel
%A Álvarez Sierra, María De Los Ángeles
%T Biogeographic provincialism in rodent faunas from the Iberoccitanian Region(southwestern Europe) generates severe diachrony within the Mammalian Neogene(MN) biochronologic scale during the Late Miocene
%D 2011
%@ 0031-0182
%U https://hdl.handle.net/20.500.14352/44280
%X In order to develop paleoecological studies involving many fossil sites, there is a need to establish a consistenttime framework, which enables us to arrange the fossil associations according to a sequence of biotic eventsand subsequently to test a relationship with paleoenvironmental changes. The nature of the continental fossilrecord has given rise to much controversy with regard to the establishment of general biostratigraphicalscales. Additionally, biochronological scales are sometimes all that can be proposed. The primary goal of thepresent paper is to present a time arrangement for the Iberoccitanian micromammalian fossil sites from thelatest Middle Miocene to the Mio–Pliocene boundary, spanning around 7 million years (approximately 12.61–4.95 Ma). Herein we study over one hundred faunal lists of rodents from the Iberoccitanian Region, compiledfrom the literature. Previous research has described two biogeographical provinces in our study area: anorthern one (Vallès–Penedès and southeast France) and a southern one (all the Iberian basins, except theVallès–Penedès). We therefore conducted Alroy's Maximum Likelihood Appearance Event Ordination (MLAEO) methodology, applying it to the database compiled for each province. Finally, using available numericaldates for a quarter of the sites, we obtained a calibrated ordination for all localities. In each analysis, the resultsobtained are roughly coherent with the Mammalian Neogene units (MN) and allow estimation of thenumerical ages for the entire set of fossil sites included in the study. Nevertheless, our results show severediachrony between the two biogeographic provinces of the Iberoccitanian Region in relation to the MNboundaries, which might be linked to the existence of a refuge area associated with more humidenvironments in the northern province.
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