Seasonal dynamics of population genetic structure in cryptic taxa of the Pellioditis marina complex (Nematoda: Rhabditida) |
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Authors: | S Derycke T Backeljau C Vlaeminck A Vierstraete J Vanfleteren M Vincx T Moens |
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Institution: | (1) Department of Biology, Marine Biology Section, Ghent University, Krijgslaan 281 (S8), 9000 Ghent, Belgium;(2) Royal Belgian Institute of Natural Sciences, Vautierstraat 29, 1000 Brussels, Belgium;(3) Evolutionary Biology Group, Department of Biology, University of Antwerp, Groenenborgerlaan 171, B-2020, Antwerpen, Belgium;(4) Department of Biology, Ghent University, K.L. Ledeganckstraat 35, 9000 Ghent, Belgium;(5) CeMoFe, Ghent University, K.L. Ledeganckstraat 35, 9000 Ghent, Belgium;(6) S. Derycke, Krijgslaan 281 (S8), 9000 Ghent, Belgium |
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Abstract: | The distribution patterns and genetic structure of the Pellioditis marina species complex in Belgium and The Netherlands were compared between four consecutive seasons. Different types of habitats
(coast, estuary, semi-estuary and lake) with different degrees of connectivity were sampled. In addition, each habitat type
was characterised by either temporal or permanent algal deposits. We screened 426 bp of the mitochondrial cytochrome oxidase
c (COI) gene with the single-strand conformation polymorphism (SSCP) method in 1615 individuals of Pellioditis marina. The 51 haplotypes were divided into four (sympatric) lineages, with divergences ranging from 0.25 to 10.6%. Our results
show that the lineages have different temporal dynamics, which may be linked to abiotic factors. Analysis of Molecular Variance
(AMOVA) indicated a significant structuring in the PmI lineage, which correlated with habitat characteristics and which changed
over time (Mantel, r = 0.51; p = 0.126). Intrapopulational diversity was similar in all locations, and temporal changes in haplotype frequencies were not
higher in temporary than in permanent algal deposits. Instead, the results of the temporal survey indicated that (some) P. marina populations are characterised by a metapopulation structure. It is emphasized that a complete and correct interpretation
of processes causing genetic structuring within species and of the genetic structure itself can only be done when analyses
are performed at several time points. |
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Keywords: | genetic structure metapopulation mtDNA nematode Pellioditis marina SSCP temporal variation |
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