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Allozyme diversity levels in two congeneric Dioon spp. (Zamiaceae, Cycadales) with contrasting rarities |
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| Authors: | Dánae Cabrera-Toledo Jorge González-Astorga Fernando Nicolalde-Morejón Francisco Vergara-Silva Andrew P Vovides |
| Institution: | 1. Laboratorio de Ecología y Evolución de Recursos Vegetales, Centro de Investigaciones en Ecosistemas, Universidad Autónoma de México, Campus Morelia, Antigua Carretera a Pátzcuaro No. 8701, 58190, Morelia, Michoacán, Mexico 2. Laboratorio de Genética de Poblaciones, Red de Biología Evolutiva, Instituto de Ecología, A.C. km 2.5 Antigua Carretera a Coatepec No. 351, 91070, Xalapa, Veracruz, Mexico 3. Instituto de Investigaciones Biológicas, Universidad Veracruzana, Av. Luis Castelazo Ayala s/n, Col. Industrial ánimas, 91190, Xalapa, Veracruz, Mexico 4. Laboratorio de Sistemática Molecular (Jardín Botánico), Instituto de Biología, Universidad Nacional Autónoma de México, 3er Circuito Exterior, Ciudad Universitaria, Coyoacán, 04510, Mexico D.F., Mexico 5. Laboratorio de Biología Evolutiva de Cycadales, Red de Biología Evolutiva, Instituto de Ecología, A.C. km 2.5 Antigua Carretera a Coatepec No. 351, 91070, Xalapa, Veracruz, Mexico |
| Abstract: | Allozyme diversity and population genetic structure studies were conducted in populations of two Mexican cycad species occurring in adjacent and closely related biogeographic regions. We evaluated if rarity traits in Dioon caputoi, a micro-endemic species, and Dioon merolae, a regional endemic with a wider distribution, influence levels of genetic diversity in different ways. We also explored if genetic structure differs in these species, considering that they have similar population histories. Our results indicate that D. caputoi harbors lower levels of genetic diversity and allelic richness (H E = 0.358, P = 76.9, A r = 1.86) than D. merolae (H E = 0.446, P = 92.3, A r = 2). However, genetic structure does not differ between the two species despite their contrasting geographic distributions (F ST = 0.06 vs. 0.07; D. caputoi and D. merolae, respectively). The comparison of population genetic structure information with historical and geographical aspects of the populations suggests that the rarity of D. caputoi might be due to relatively recent local ecological factors. |
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