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Journal of Heredity Advance Access published online on March 2, 2005
Journal of Heredity, doi:10.1093/jhered/esi043
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© The American Genetic Association. 2005. All rights reserved. For Permissions, please email: journals.permissions@oupjournals.org.
Received February 16, 2004
Accepted December 15, 2004

Brief Communication

Assessing Genetic Diversity in Clonal Organisms: Low Diversity or Low Resolution? Combining Power and Cost Efficiency in Selecting Markers

S. Arnaud-Haond 1*, F. Alberto 1, S. Teixeira 1, G. Procaccini 2, E. A. Serrão 1, and C. M. Duarte 3

1 From CCMAR, CIMAR - Laboratório Associado, FCMA- Univ. Algarve, Gambelas, P-8005-139, Faro, Portugal
2 From Stazione Zoologica "A. Dohrn," Laboratorio di Ecologia del Benthos, 80077 Ischia, Naples, Italy
3 From Instituto Mediterraneo de Estudios Avanzados, CSIC-Univ. Illes Balears, C/ Miquel Marques 21, 07190 Esporles, Mallorca, Spain

* To whom correspondence should be addressed.
S. Arnaud-Haond, E-mail: sarnaud{at}ualg.pt


  Abstract

The increasing use of molecular tools to study populations of clonal organisms leads us to question whether the low polymorphism found in many studies reflects limited genetic diversity in populations or the limitations of the markers used. Here we used microsatellite datasets for two sea grass species to provide a combinatory statistic, combined with a likelihood approach to estimate the probability of identical multilocus genotypes (MLGs) to be shared by distinct individuals, in order to ascertain the efficiency of the markers used and to optimize cost-efficiently the choice of markers to use for deriving unbiased estimates of genetic diversity. These results strongly indicate that conclusions from studies on clonal organisms derived using markers showing low polymorphism, including microsatellites, should be reassessed using appropriate polymorphic markers.


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