Persistent genetic signatures of colonization in Brachionus manjavacas rotifers in the Iberian Peninsula.

摘要: Recent phylogeographical assessments have consistently shown that continental zooplankton display high levels of population subdivision, despite the dispersal capacity their diapausing propagules. As such, there is an apparent paradox between observed cosmopolitanism in associated with long-distance dispersal, and strong structures at a regional scale. Such dynamics, far from migration-drift equilibrium, been rotifer species complex Brachionus plicatilis, group over dozen inhabiting salt lakes coastal lagoons worldwide. Here we present mitochondrial DNA phylogeography one these species, manjavacas, Iberian Peninsula, where it often co-occurs morphologically similar B. plicatilis sensu stricto. We obtained sequences 233 individuals eggs clonal cultures 16 Tunisian lake. Two strongly supported deep clades were found (A B). Phylogenetic nested clade analysis showed A has structure, similarity patterns manjavacas s.s. These include (i) signatures allopatric fragmentation central southern populations, (ii) range expansions both likely to occurred during Pleistocene. find evidence for glacial refugium Guadiana basin. Clades B co-occurred several because expansion secondary contact clades. The co-occurrence not recent, might experienced environmental challenges correlation genetic geographical distance suggests historical events can lead such correlation, mirroring effects 'isolation by distance' equilibrium populations.