Evaluación de AE y PAE para identificar trazos generalizados, a partir de las serpientes del estado de Hidalgo, México

Gustavo Montiel Canales,Irene Goyenechea Mayer-Goyenechea,Leonardo Fernández Badillo,Jesús Martín Castillo Cerón

doi:10.15517/rbt.v64i4.21219

Abstract

One of the most important concepts in Panbiogeography is the generalized track, which represents an ancestral biota fragmented by geological events that can be recovered through several methods, including Parsimony analysis of endemicity (PAE) and endemicity analysis (EA). PAE has been frequently used to identify generalized tracks, while EA is primarily designed to find areas of endemicity, but has been recently proposed for identifying generalized tracks as well. In this study we evaluated these methods to find generalized tracks using the distribution of the 84 snake species of Hidalgo. PAE found one generalized track from three individual tracks (Agkistrodon taylori, Crotalus totonacus and Pliocercus elapoides), supported by 89 % of Bootstrap, and EA identified two generalized tracks, with endemicity index values of 2.71-2.96 and 2.84-3.09, respectively. Those areas were transformed to generalized tracks. The first generalized track was retrieved from three individual tracks (Micrurus bernadi, Rhadinaea marcellae and R. quinquelineata), and the second was recovered from two individual tracks (Geophis mutitorques and Thamnophis sumichrasti). These generalized tracks can be considered a unique distribution pattern, because they resembled each other and agreed in shape. When comparing both methods, we noted that both are useful for identifying generalized tracks, and although they can be used independently, we suggest their complementary use. Nevertheless, to obtain accurate results, it is useful to consider theoretical bases of both methods, along with an appropriate choice of the size of the area. Results using small-grid size in EA are ideal for searching biogeographical patterns within geopolitical limits. Furthermore, they can be used for conservation proposals at state level where endemic species become irreplaceable, and where losing them would imply the extinction of unique lineages.

Highlights

In this study we evaluated these methods to find generalized tracks using the distribution of the 84 snake species of Hidalgo
When comparing both methods, we noted that both are useful for identifying generalized tracks, and although they can be used independently, we suggest their complementary use
La prueba de robustez estadística mostró un soporte del 89 %, mientras que con el análisis de endemicidad (AE) se identificaron dos áreas de endemismo con valores del índice de endemicidad de 2.71-2.96 y 2.843.09 respectivamente, las cuales fueron transformadas a trazos generalizados; el primero formado por tres trazos individuales (Micrurus bernadi, Rhadinaea marcellae y R. quinquelineata) y el segundo formado por dos trazos individuales (Geophis mutitorques y Thamnophis sumichrasti)

Summary

Introduction

El objetivo de este trabajo fue evaluar el análisis de simplicidad de endemismos (Morrone, 2015) y el análisis de endemicidad (Szumik & Goloboff, 2004) a través del enfoque propuesto por Fernández-Badillo et al (2014) para identificar trazos generalizados a partir de las serpientes distribuidas en el estado de Hidalgo, con la finalidad de identificar semejanzas y diferencias en la forma en la que se componen los patrones de distribución.

Results

Conclusion