Scaling of processes shaping the clonal dynamics and genetic mosaic of seagrasses through temporal genetic monitoring

Type Article
Date 2014-02
Language English
Author(s) Becheler Ronan1, Benkara Elsa1, Moalic Yann1, Hily Christian2, Arnaud-Haond SophieORCID1
Affiliation(s) 1 : IFREMER, DEEP, Ctr Brest, F-29280 Plouzane, France.
2 : IUEM, Lab Sci Environm Marin, Plouzane, France.
Source Heredity (0018-067X) (Nature Publishing Group), 2014-02 , Vol. 112 , N. 2 , P. 114-121
DOI 10.1038/hdy.2013.82
WOS© Times Cited 22
Keyword(s) clonality, seagrass, spatio-temporal genetic structure, Zostera marina
Abstract Theoretically, the dynamics of clonal and genetic diversities of clonal plant populations are strongly influenced by the competition among clones and rate of seedling recruitment, but little empirical assessment has been made of such dynamics through temporal genetic surveys. We aimed to quantify 3 years of evolution in the clonal and genetic composition of Zostera marina meadows, comparing parameters describing clonal architecture and genetic diversity at nine microsatellite markers. Variations in clonal structure revealed a decrease in the evenness of ramet distribution among genets. This illustrates the increasing dominance of some clonal lineages (multilocus lineages, MLLs) in populations. Despite the persistence of these MLLs over time, genetic differentiation was much stronger in time than in space, at the local scale. Contrastingly with the short-term evolution of clonal architecture, the patterns of genetic structure and genetic diversity sensu stricto (that is, heterozygosity and allelic richness) were stable in time. These results suggest the coexistence of (i) a fine grained (at the scale of a 20 x 30 m quadrat) stable core of persistent genets originating from an initial seedling recruitment and developing spatial dominance through clonal elongation; and (ii) a local (at the scale of the meadow) pool of transient genets subjected to annual turnover. This simultaneous occurrence of initial and repeated recruitment strategies highlights the different spatial scales at which distinct evolutionary drivers and mating systems (clonal competition, clonal growth, propagule dispersal and so on) operate to shape the dynamics of populations and the evolution of polymorphism in space and time.
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