Contrasting geographical patterns of ancient and modern genetic lineages in Mediterranean Abies species

Dering

Tree Genetics & Genomes

et al. 2014

In the present study, a genetic analysis of nuclear microsatellites was conducted in Abies cilicica populations growing in West Taurus, East Taurus, and Lebanon mountains to obtain evidence for significant genetic differentiation. Despite range fragmentation, all examined populations tended to maintain a relatively high level of genetic diversity (H E = 0.724) and showed moderate genetic differentiation (F ST = 0.134) that is frequently noted in Mediterranean tree species. However, significant inbreeding, bottleneck effect, and low effective population sizes were detected, that may negatively affect species genetic resources. Bayesian clustering revealed three distinct groups, "West Taurus", "East Taurus," and "Lebanon", which reflect geographic structure of the species natural range. Minor genetic admixture between Lebanese and East Taurus populations of A. cilicica was found, but no genetic admixture between Lebanese populations and West Taurus. We argue that significant genetic differentiation discovered among areas of species occurrence is probably due to the effect of long-lasting genetic isolation that started in that region along with the Pleistocene climatic alternation and was further enhanced with human-induced deforestations.

Section: Genetic Diversitysupporting

confidence: 92%

Section: Genetic Diversitymentioning

confidence: 99%

Effect of geographic range discontinuity on species differentiation—East-Mediterranean Abies cilicica: a case study

Dering

Tree Genetics & Genomes

et al. 2014

“…The biogeography and delimitation of fir species outside China have been explored previously using mtDNA and ptDNA markers (for example, see Tsumura and Suyama, 1998;Liepelt et al, 2002Liepelt et al, , 2010JaramilloCorrea et al, 2008). These studies have revealed different phylogeographic structures and/or inconsistent patterns of species delimitation for the two markers, with mtDNA variation tending to reveal stronger intraspecific genetic structure and weaker resolution of species boundaries when compared with ptDNA.…”

Section: Introductionmentioning

confidence: 99%

Species delimitation and biogeography of two fir species (Abies) in central China: cytoplasmic DNA variation

et al. 2011

It remains unclear how speciation history might contribute to species-specific variation and affect species delimitation. We examined concordance between cytoplasmic genetic variation and morphological taxonomy in two fir species, Abies chensiensis and A. fargesii, with overlapping distributions in central China. Range-wide genetic variation was investigated using mitochondrial (mt) and plastid (pt) DNA sequences, which contrast in their rates of gene flow. Four mtDNA haplotypes were recovered and showed no obvious species' bias in terms of relative frequency. In contrast, a high level of ptDNA variation was recorded in both species with 3 common ptDNA haplotypes shared between them and 21 rare ptDNA haplotypes specific to one or other species. We argue that the lack of concordance between morphological and molecular variation between the two fir species most likely reflects extensive ancestral polymorphism sharing for both forms of cytoplasmic DNA variation. It is feasible that a relatively fast mutation rate for ptDNA contributed to the production of many species-specific ptDNA haplotypes, which remained rare due to insufficient time passing for their spread and fixation in either species, despite high levels of intraspecific ptDNA gene flow. Our phylogeographic analyses further suggest that polymorphisms in both organelle genomes most likely originated during and following glacial intervals preceding the last glacial maximum, when species distributions became fragmented into several refugia and then expanded in range across central China.

“…The relationships among the firs of the Balkans and North Anatolia are generally better detectable when using genetic markers rather than morphological characteristics (Scaltsoyiannes et al, 1999;Kaya et al, 2008;Liepelt et al, 2010). Within the latter set, cone length and diameter, cone scale shape, cone bract shape, and the level of insertion among the cone scales are recognized as essential to distinguish between species (Yaltırık, 1993;Bagci and Babaç, 2003;Farjon, 2010;Kurt et al, 2016).…”

mentioning

confidence: 99%

“…×borisii-regis Mattf. (Mitsopoulos and Panetsos, 1987;Panetsos, 1992;Scaltsoyiannes et al, 1999;Bagci and Babaç, 2003;Liepelt et al, 2010;Kurt et al, 2016) using different morphological and genetic markers.…”

mentioning

confidence: 99%

Taxonomic position of Abies equi-trojani on the basis of needlecharacters by comparison with different fir species

Jasiñska¹,

Sękiewicz²,

Ok³

et al. 2017

Turk J Bot

IntroductionThe name 'Abies equi-trojani' was proposed by Paul Sintenis and Paul Ascherson on the herbarium label (Sintenis, 1883, pl. exicc. Iter trojanum, No 523) for the material collected from Kazdağı (Mount Ida), but without a diagnosis, which had been made by Boissier ( 1884), who treated the specimens collected by Sintenis as A. pectinata DC. var. equi-trojani Asch. & Sint. ex Boiss. Shortly thereafter, this taxon was included as a variety of A. nordmanniana Spach by Guinier and Maire (1908): A. nordmanniana var. equi-trojani (Asch. & Sint. ex Boiss.) Guinier & Maire; and more recently as a subspecies of silver fir: A. alba Mill. subsp. equi-trojani (Asch. & Sint. ex Boiss.) Asch. & Graebn. (for details see Yaltırık, 1974).The systematic position of A. equi-trojani has been disputed several times due to its intermediate position between A. cephalonica Loudon and A. nordmanniana with respect to the morphological characters of cones, types of needle apex, position of resin canals in the needle, pollen