Phylogeographic analyses of the 30°S south-east Pacific biogeographic transition zone establish the occurrence of a sharp genetic discontinuity in the kelp Lessonia nigrescens: Vicariance or parapatry?

Spatial pattern of genetic and morphological diversity in the direct developer Acanthina monodon (Gastropoda: Mollusca)

“…Recent studies focused on the major biogeographic breaks of the SEP coast indicate that the occurrence of this concordance appears to depend on the dispersal potential of the species. The kelp Lessonia nigrescens and the intertidal barnacle Noto chthamalus scabrosus show an exact match between the genetic and biogeographic breaks at 30°S (Tellier et al 2009, Zakas et al 2009). In contrast, population genetic structures of the marine gastropod Concholepas concholepas, the barnacle Jehlius cirratus and the giant kelp Macrocystis pyrifera do not appear to match the 30°S biogeographic break (Cárdenas et al 2009, Zakas et al 2009, Macaya & Zuccarello 2010.…”

“…These few studies suggest that the existence of concordance between biogeographic and genetic breaks depends on the dispersal potential of the species (Cárdenas et al 2009, Tellier et al 2009, Zakas et al 2009, Fraser et al 2010, Macaya & Zuccarello 2010. Although these studies have increased our knowledge of the genetic structure of marine species along the SEP coast, the study of principally the 30°S biogeographic break, and the few species considered, says very little about the past and present forces that shape intraspecific variation (Kelly & Eernisse 2007).…”

Genetic structure of the giant kelp Macrocystis pyrifera along the southeastern Pacific

“…To date, only 1 study has addressed concordance between phylogeographic patterns and the 2 main biogeographic transitions along the SEP. Tellier et al (2009) found a major phylogeographic break at 30°S in the intertidal kelp Lessonia nigrescens, a brown alga with reduced gene flow (Martínez et al 2003, Faugeron et al 2005 and no floating structures that could facilitate dispersal of adult thalli. We may expect a different result in kelps with high dispersal potential, such as Macrocystis pyrifera.…”

From population connectivity to the art of striping Russian dolls: the lessons from Pocillopora corals

“…So population genetics data collected for estimating connectivity, and more broadly phylogeographic analyses or barcoding, may in turn be used to refine taxonomic knowledge at the species rank, making them hardly ineluctable in an approach of integrative taxonomy. As an illustration, trying to understand the biogeographic shift in the kelp Lessonia nigrescens , Tellier, Meynard, Correa, Faugeron, and Valero (2009) identified two cryptic species using a combination of four genes among 1,000 individuals covering more than 2,500 km of coastline. The two divergent genetic lineages show a parapatric latitudinal distribution: one extends from southern Peru (17°S) to central Chile (30°S), and the other from central Chile (29°S) to Chiloe Island (42°S), both lineages spatially overlapping in a narrow area (29–30°S) in discrete patches where individuals belong to either the northern or southern species.…”