INVESTIGADORES
MORANDO Mariana
congresos y reuniones científicas
Título:
Retrieving shallow and deep history in the Andean and Patagonian biota: Liolaemus elongatus-kriegi complex (Squamata: Liolaemidae) as a Model System
Autor/es:
MORANDO, M.; AVILA, L.J.; SITES, JR. J. W.
Lugar:
Urbana/Champaing
Reunión:
Congreso; Evolution 2002; 2002
Institución organizadora:
University of Illinois
Resumen:
Lizards of the genus Liolaemus are one of the most diverse
groups of vertebrates in southern South America.
The most diverse group within the genus is the subgenus Liolaemus, also
referred as chiliensis group, which includes several species we refer
to as Liolaemus elongatus-kriegi complex (L. elongatus, L.
petrophilus, L. ceii, L. kriegi, L. buergeri, L. austromendocinus, L.
capillitas, L. heliodermis, L. thermarum. L. leopardinus, L.
curis, and some undescribed taxa). The
objectives of this work are to study the evolution of various species groups
within this complex, determining species boundaries, their shallow and deep
phylogenetic relationships, and then to infer speciation processes in the
eastern arid slopes of Andean and Patagonia landscapes of Argentina in
relation to geological and climatic events. We used 199 individuals from this
complex, from XXX localities and 9 outgroups. We used a combined approach with
traditional methods for phylogeny reconstruction and statistical parsimony
methods for intraspecific phylogenies. As genetic markers we used regions of
the cyt-b, ND4 and 12S mitochondrial genes. We present phylogenetic
relationships of this complex, and discuss the species boundaries for
populations of three main groups within it, L. petrophilus group
(with two different lineages within it), L. elongatus group (with four
separate entities), and L. kriegi group (with at least two separate
lineages). For the L. elongatus and L. kriegi groups, the
differentiation was greatest in the northern Patagonian clades, where the
effects of more intense geological (vulcanology) and climatic events
(glaciation) could have lead to a more rapid differentiation of these
populations. The differentiation of the L. petrophilus populations
presents a different pattern from the other two groups.