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Effect of Geographic Range Discontinuity on Species Differentiation—East-Mediterranean Abies Cilicica:Acasestudy

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Effect of Geographic Range Discontinuity on Species Differentiation—East-Mediterranean Abies Cilicica:Acasestudy View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Springer - Publisher Connector Tree Genetics & Genomes (2015) 11:810 DOI 10.1007/s11295-014-0810-5 ORIGINAL PAPER Effect of geographic range discontinuity on species differentiation—East-Mediterranean Abies cilicica:acasestudy Katarzyna Sękiewicz & Monika Dering & Maciej Sękiewicz & Krystyna Boratyńska & Grzegorz Iszkuło & Monika Litkowiec & Tolga Ok & Magda Bou Dagher-Kharrat & Adam Boratyński Received: 3 June 2014 /Revised: 17 October 2014 /Accepted: 27 October 2014 /Published online: 22 November 2014 # The Author(s) 2014. This article is published with open access at Springerlink.com Abstract In the present study, a genetic analysis of nuclear genetic admixture between Lebanese populations and West microsatellites was conducted in Abies cilicica populations Taurus. We argue that significant genetic differentiation dis- growing in West Taurus, East Taurus, and Lebanon mountains covered among areas of species occurrence is probably due to to obtain evidence for significant genetic differentiation. the effect of long-lasting genetic isolation that started in that Despite range fragmentation, all examined populations tended region along with the Pleistocene climatic alternation and was to maintain a relatively high level of genetic diversity (HE= further enhanced with human-induced deforestations. 0.724) and showed moderate genetic differentiation (FST= 0.134) that is frequently noted in Mediterranean tree species. Keywords Biogeography . Cilician fir . Mediterranean However, significant inbreeding, bottleneck effect, and low region . nSSR markers . Plant diversity effective population sizes were detected, that may negatively affect species genetic resources. Bayesian clustering revealed three distinct groups, “West Taurus”, “East Taurus,” and Introduction “Lebanon”, which reflect geographic structure of the species natural range. Minor genetic admixture between Lebanese and What mechanisms are responsible for the genetic divergence East Taurus populations of A. cilicica was found, but no leading to speciation is one of the major questions in evolu- tionary biology (Schluter 2001; Aguilée et al. 2013;Hopkins 2013). Natural selection driving local adaptations, genetic Communicated by Z. Kaya drift, and mutations are factors that increase genetic differen- Electronic supplementary material The online version of this article tiation, while gene flow hinders it (Wright 1931; Slatkin (doi:10.1007/s11295-014-0810-5) contains supplementary material, which is available to authorized users. 1995). The influence of natural selection and genetic drift on the pattern of differentiation largely depends on the rate of ę * : : ę : ń : K. S kiewicz ( ) M. Dering M. S kiewicz K. Boraty ska gene transfer between populations mediated by pollen and G. Iszkuło : M. Litkowiec : A. Boratyński Institute of Dendrology, Polish Academy of Sciences, Parkowa 5, seed dispersal (Grivet et al. 2009). In wind-pollinated conifers, 62-035 Kórnik, Poland pollen-mediated gene flow is the main factor acting against e-mail: [email protected] genetic differentiation due to the large potential for effective long-distance dispersal (Robledo-Arnuncio 2011). However, G. Iszkuło Faculty of Biological Sciences, University of Zielona Góra, Prof. Z. range fragmentation may prevent or restrict gene flow be- Szafrana 1, 65-516 Zielona Góra, Poland tween populations and thus support among-population differ- entiation (Slatkin 1987; Young et al. 1996). Hence, fragmen- T. Ok tation resulting in genetic isolation may promote genetic di- Department of Forest Botany, Faculty of Forestry, Kahramanmaras Sutcu Imam University, 46100 Kahramanmaras, Turkey vergence leading to vicariance and constitutes the basic model of speciation, i.e., the allopatric speciation (Mayr 1964; M. B. Dagher-Kharrat Abbott et al. 2008; Comes et al. 2008). ‘ ’ Laboratoire Caractérisation Génomique des Plantes , Faculté des Abies alba Mill. is the only species from the European Sciences, Université Saint-Joseph, Campus Sciences et Technologies, Mar Roukos, Mkalles, BP: 1514, Riad el Solh, representatives of the genus Abies that has a wide, almost Beirut 1107 2050, Lebanon continuous range of distribution (Muller et al. 2007). In 810, Page 2 of 10 Tree Genetics & Genomes (2015) 11:810 contrast, the current distribution of the majority of the fir eastern lineage (A. cilicica subsp. cilicica), known also from species growing in the Mediterranean is highly fragmented Syria and Lebanon, and a western lineage (A. cilicica subsp. (Jalas and Suominen 1988; Schütt 1991). The fragmented isaurica Coode and Cullen) with either pubescent or glabrous pattern of distribution, which is largely the result of the geo- young shoots, respectively (Coode and Cullen 1965; Farjon logic and climatic history of the Mediterranean region where 2010). firs have evolved, has fostered differentiation and local adap- Considering the current disjunctive distribution of the spe- tations which have led to the emergence of many species, cies, we assumed that fragmentation of the Cilician fir range subspecies, and varieties in the genus Abies (Linares 2011). that has started in Pleistocene in results of climatic alternation The genetic integrity of a species relies on the genetic con- was the evolutionary impulse driving within-species differen- nectivity of spatially arranged populations via gene flow. tiation. Using genetic analyses, we investigated whether or not Mediterranean firs, characterized by disjunctive distributions substantial genetic differentiation exists between the and rather limited pollen dispersal capacity (Poska and Pidek A. cilicica populations located in remote and currently isolated 2009; Geburek et al. 2012), are an excellent evolutionary parts of the species natural range. Particularly, we wondered if model for investigating the role of range fragmentation in the genetic differentiation of this Mediterranean tree species population divergence. refers to general patterns of differentiation reported in this Cilician fir, Abies cilicica (Antoine and Kotschy) Carrière region. Since mountain ranges are one of the major factors is a 30–35-m-high tree and can be up to 2 m in diameter at in establishing biogeographic patterns, we also wanted to breast height (Coode and Cullen 1965). It grows in the East- characterize the genetic relationships between populations of Mediterranean region, in the Taurus mountains and Amanus A. cilicica growing in the different and geographically isolated in Turkey, the Jbel Ansariye in Syria, and Jabal Ammoua and mountain ranges, i.e., West Taurus, East Taurus, and the Ehden in Lebanon (Browicz and Zieliński 1984;Akkemik̇ Lebanon mountains predicting significant genetic differentia- 2000; Kaya and Raynal 2001). In Turkey, it is distributed at tions to be detected. In addition, we wanted to explore the elevations between 1,150 and 2,000 m on the north- and 1,450 intra-species genetic variability in context of two subspecies and 1,550 m on the south-facing slopes of the Taurus, opti- that are recognized within A. cilicica based on their morpho- mally at 1,200–1,800 m (Kaya and Raynal 2001). The species logical distinctiveness. forms pure or mixed stands with Pinus nigra J.F. Arnold subsp. pallasiana (Lamb.) Holmboe and Cedrus libani A. Rich. (Kaya and Raynal 2001; Kavgaci et al. 2010). Materials and methods Additionally, Juniperus excelsa M. Bieb., Juniperus foetidissima Willd., and Juniperus drupacea Labill. are com- Plant material ponents of fir forests that are frequently replaced by juniper communities (Kavgaci et al. 2010). A. cilicica is at risk in its Material for this study was collected from seven natural pop- lower elevation localities due to arid conditions (Aussenac ulations of A. cilicica (Fig. 1 and Table 1). Four of them were 2002; Gardner and Knees 2013) and is a near-threatened from the East Taurus mountains in Turkey and Lebanon species in Lebanon (Talhouk et al. 2003)wherefirforests mountains and, according to taxonomic classification based reach their southernmost distribution. on morphology, are representative of A. cilicica subsp. cilicica The current geographic distribution of A. cilicica is dis- (Farjon 2010). Three populations sampled in West Taurus are junctive, divided into several dozen areas isolated from each representative of A. cilicica subsp. isaurica.Thirtyrandomly other (Browicz and Zieliński 1984; Kaya and Raynal 2001), dispersed adult individuals separated by distances >50 m were while the ancestral taxa may have had a more continuous sampled from each natural population with the exception of distribution (Linares 2011). The range fragmentation of this the LB_2 population where only 12 individuals could be species was strong during cool periods of the Pleistocene sampled. A total of 192 needle samples from Cilician fir was because of the profound aridity of the climate during that collected and successfully analyzed in this study. period (Leroy and Arpe 2007). Based on an extensive pollen record dataset, the Holocene biogeography of Abies indicates that it was more abundant than in the present (Collins et al. DNA extraction, SSR amplification, and statistical analysis 2012). However, modern range fragmentation has become prominent due to the development of an increasingly arid Total DNA was extracted from all samples using ca. 50 mg of climate and, most recently, due to human-generated defores- dry needles according to Dumolin et al. (1995). Eleven nucle- tation
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