title: Scaling of processes shaping the clonal dynamics and genetic mosaic of seagrasses through temporal genetic monitoring.
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 × 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.
authors.affiliation: Institut Français de Recherche sur la MER (IFREMER)-Département 'Etude des Ecosystèmes Profonds'- DEEP, Centre de Brest, Plouzané Cedex, France.
authors.forename: R
authors.initials: R
authors.lastname: Becheler
authors.affiliation: Institut Français de Recherche sur la MER (IFREMER)-Département 'Etude des Ecosystèmes Profonds'- DEEP, Centre de Brest, Plouzané Cedex, France.
authors.forename: E
authors.initials: E
authors.lastname: Benkara
authors.affiliation: Institut Français de Recherche sur la MER (IFREMER)-Département 'Etude des Ecosystèmes Profonds'- DEEP, Centre de Brest, Plouzané Cedex, France.
authors.forename: Y
authors.initials: Y
authors.lastname: Moalic
authors.affiliation: Institut Universitaire Européen de la MER (IUEM)-Laboratoire des sciences de l'Environnement Marin, Plouzanè, France.
authors.forename: C
authors.initials: C
authors.lastname: Hily
authors.affiliation: Institut Français de Recherche sur la MER (IFREMER)-Département 'Etude des Ecosystèmes Profonds'- DEEP, Centre de Brest, Plouzané Cedex, France.
authors.forename: S
authors.initials: S
authors.lastname: Arnaud-Haond
mesh_terms: D000483:Alleles; D019143:Evolution, Molecular; D014644:Genetic Variation; D005828:Genetics, Population; D009030:Mosaicism; D013997:Time Factors; D064028:Tracheophyta / Q000235:genetics*
references.citation: Mol Ecol. 2005 Aug;14(9):2669-81
references.pmid: 16029469
references.citation: J Hered. 2012 Jul;103(4):533-46
references.pmid: 22577191
references.citation: Mol Ecol. 2007 Dec;16(24):5115-39
references.pmid: 17944846
references.citation: Genetics. 1997 Apr;145(4):1219-28
references.pmid: 9093870
references.citation: Mol Ecol. 2010 Jun 1;19(12):2394-407
references.pmid: 20465589
references.citation: Evolution. 1996 Oct;50(5):1808-1821
references.pmid: 28565593
references.citation: PLoS One. 2012;7(2):e30454
references.pmid: 22312426
references.citation: Mol Ecol. 2004 Jul;13(7):1923-41
references.pmid: 15189214
references.citation: Evolution. 1984 Nov;38(6):1358-1370
references.pmid: 28563791
references.citation: Mol Ecol. 2004 Apr;13(4):921-35
references.pmid: 15012766
references.citation: Genetics. 1978 Jul;89(3):583-90
references.pmid: 17248844
references.citation: Mol Ecol. 2010 Sep;19(17):3708-26
references.pmid: 20723063
references.citation: Proc Natl Acad Sci U S A. 1998 Mar 31;95(7):3346-8
references.pmid: 9520366
references.citation: J R Soc Interface. 2007 Dec 22;4(17):1093-1102
references.pmid: 17472906
references.citation: EXS. 1993;67:153-75
references.pmid: 8400687
references.citation: BMC Evol Biol. 2011 Jan 31;11:33
references.pmid: 21281515
references.citation: Evolution. 2013 Jun;67(6):1660-75
references.pmid: 23730760
references.citation: Ecology. 2006 Dec;87(12):3082-94
references.pmid: 17249233
references.citation: Am J Bot. 2004 Dec;91(12):2013-21
references.pmid: 21652350
references.citation: Trends Ecol Evol. 1993 Sep;8(9):313-6
references.pmid: 21236180