SNP genotypes from Magallanes

Hybrid zones among mussel species have been extensively studied in the
northern hemisphere. In South America, it has only recently become
possible to study the natural hybrid zones, due to the clarification of
the taxonomy of native mussels of the Mytilus genus. Analyzing 54 SNP
markers, we show the genetic species composition and admixture in the
hybrid zone between M. chilensis and M. platensis in the southern end of
South America. Bayesian, non-Bayesian clustering and re-assignment
algorithms showed that the natural hybrid zone between M. chilensis and M.
platensis in the Strait of Magellan, Isla Grande de Tierra del Fuego, and
the Falkland Islands shows complex architecture. It can be divided into
three different areas: the first one is on the Atlantic coast where only
pure M. platensis and hybrid were found. In the second one,
inside the Strait of Magellan, pure individuals of both species and
mussels with variable degrees of hybridization coexist. In the last area
at the Strait in front of Punta Arenas City, fjords on the Isla Grande de
Tierra del Fuego, and at the Beagle Channel, only M. chilensis and a low
number of hybrids were found.  According to the proportion of
hybrids, bays with protected conditions away from strong currents would
give better conditions for hybridization. We do not find evidence of any
other mussel species such as M. edulis, M. galloprovincialis, M.
planulatus, or M. trossulus in the zone