Phylogeny and systematics of Crocidura suaveolens species group: corroboration and controversy between nuclear and mitochondrial DNA markersстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Despite obvious advances in systematic research on
Palaearctic white-toothed shrews (Crocidura), phylogenetic
relationships and species diagnosis of 40-chromosome
species (suaveolens sp. group) remain poorly
understood. Phylogenetic relationships of these shrews
were analyzed on the basis of two independent molecular
markers: interspersed repeat PCR fingerprints (inter-
SINE-PCR) and complete (1140 bp) or partial (;400 bp)
sequences of the mtDNA cyt b gene. According to these
data, C. suaveolens from Western Europe (Italy) appeared
distinct from samples of C. suaveolens from Eastern
Europe and Mongolia, as well as a Siberian sample.
mtDNA introgression of Eastern European C. suaveolens
with C. gueldenstaedtii in their contact zone in the
Tuapse region was revealed. Hybrydization between C.
gueldenstaedtii and C. suaveolens resulted in the formation
of a population, nuclear DNA and morphological
characteristics typical for C. gueldenstaedtii, while the
mitochondrial genome is assimilated from C. suaveolens.
The population of the Talysh region of the Caucasus (C.
caspica) represents a separate entity that is clearly distinguished
from the populations of Georgia and Tuapse
(C. gueldenstaedtii) and C. suaveolens. Therefore, the
position of C. caspica as a full species is supported. The
present analysis of both inter-SINE-PCR and cyt b
sequence data revealed two major clades in Palaearctic
40-chromosome Crocidura. The eastern clade is formed
by true C. suaveolens/C. sibirica, together with C. caspica,
and the western clade is formed by Western European
C. suaveolens, which should be treated as a
distinct species, C. mimula and the closely related C.
gueldenstaedtii.