Disentangling the evolutionary history of the genus Barbus sensu lato, a twenty years adventure

TitleDisentangling the evolutionary history of the genus Barbus sensu lato, a twenty years adventure
Publication TypeBook Chapter
Year of Publication2014
AuthorsBerrebi, P, Chenuil A, Kotlík P, Machordom A, Tsigenopoulos CS
Book TitleProfessor Carlos Almaça (1934-2010) - Estado da Arte em Áreas Cientificas que Desenvolveu
EditionMuseu Nacional de História Natural e da Ciência
Pages29-55
PublisherMuseu Nacional de História Natural e da Ciência
CityLisboa
ISBN Number978-972-98196-6-7
Abstract

During the period 1965-1985, Professor Carlos Almaça produced
a great amount of data on the Barbus group. From the end of the eighties,
he joined a European consortium ("Barbus Roundtables") which aimed
at developing methods and concepts, gathering numerous specialists
from different fields like systematics and genetics, around Europe. At
present, we may consider that the structure of Barbus sensu lato (s.l.)
is relatively well known, even if some new results are still pending
and other studies still needed. Barbus s.l. which was first defined on
the trivial character of the presence of barbels around the mouth, has
proved to include diploid, tetraploid and hexaploid lineages, themselves
polyphyletic, which explains the difficulty to establish a comprehensive
taxonomy. The numerous contributions published since 1990, based
on karyology and molecular markers gave us a clear view of the main
attributes of the evolutionary history of this complex group. First,
according to taxonomy rules, the "true Barbus" (Barbus sensu stricto) are
composed of tetraploid species distributed around the Mediterranean,
including Danubian and Mesopotamian (Tigris and Euphrates) regions.
They are composed of a north Mediterranean lineage (Barbus genus)
and a south Mediterranean lineage (Luciobarbus genus). Other
tetraploid Barbus s.l. are known in South Africa. Barbus s.l. includes also
diploid and hexaploid lineages. Diploids are widespread and diversified,
comprising Asian (mainly south-east Asia) and African species. The
phylogenetic relationships between diploid and polyploid species need
yet to be described. Hexaploid Barbus s.l. probably appeared after
hybridization between tetraploid species (as evidenced for the genus
Capoeta). A clear and homogeneous hexaploid lineage can be followed
from Middle East up to South Africa. This rapid African radiation
constituted the genus Labeobarbus, the "large Barbus", occupying the
entire continent. The present contribution develops both the known
structure of this "Chinese puzzle" and the history of its description,
which is not yet finished.

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