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Journal of Heredity Advance Access originally published online on March 2, 2005
Journal of Heredity 2005 96(4):434-440; 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.

Brief Communication

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

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

From CCMAR, CIMAR—Laboratório Associado, FCMA- Univ. Algarve, Gambelas, P-8005-139, Faro, Portugal (Arnaud-Haond, Alberto, Teixeira, and Serrão); Instituto Mediterraneo de Estudios Avanzados, CSIC-Univ. Illes Balears, C/ Miquel Marques 21, 07190 Esporles, Mallorca, Spain (Duarte); and Stazione Zoologica "A. Dohrn," Laboratorio di Ecologia del Benthos, 80077 Ischia, Naples, Italy (Procaccini)

Address correspondence to S. Arnaud-Haond at the address above, or e-mail: sarnaud{at}ualg.pt or eserrao{at}ualg.pt.

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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