Australian Systematic Botany Australian Systematic Botany Society
Taxonomy, biogeography and evolution of plants

Just Accepted

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Environmental factors related to biogeographical transition zones of Neotropical mammals’ areas of endemism

Ignacio Ferro , Elkin Noguera-Urbano


Biogeographical transition zones are areas of complex biotic mixture located at the borders between biogeographical units. Climatic, physical and ecological factors should play an important role in allowing coexistence of different biotic elements in the transition zone. Here we explore the relationship between environmental factors and biogeographical transition zones, defined by Neotropical mammals distributions, via a model selection approach based on the Akaike information criterion and accounting for the spatial structure in the data. We detected three areas of high overlap between mammalian areas of endemism. Two of them corresponding to the well-established regional-level transition zone: Mexican (MTZ) and South American transition zones (SATZ); the third one located in South Eastern Brazil, roughly between the ParanĂ¡ and Chacoan dominion that we call: The Atlantic Forest integration zone (AF). Only one explicative variable was shared by the three transitions zones (precipitation of the warmest quarter). However, shared variables with great explanatory power point out two environmental aspect as facilitators for the coexistence of different biotic component in a given geographical area. The first one is the heterogeneity component, either topographic for the SATZ and MTZ or climatic for the AF. The second one is related non-extreme thermal conditions, precipitation of the warmest quarter, interpreted as a thermal buffer, shared by AF and SATZ and isothermality shared by MTZ and SATZ.

SB16055  Accepted 24 July 2017

© CSIRO 2017