Abstract
In the present study, we investigated the genetic structure and diversity of P. nigra populations in Bulgaria, using simple sequence nuclear repeats. Among-population structure was studied with distance and Bayesian frequency methods, assuming geometric distance and a “non-admixture” model. The “NJ” and “non-admixture” clusters confirm the “mountain effect” hypothesis of the black pine genetic structure in the study region. The analyses showed moderate among-population divergence (13.31 %; AMOVA) and evidence of genetic bottlenecks. The coalescent analyses suggest that P. nigra has survived for a long period (thousands of generations) under strong selection pressure and that its populations continued to be exposed to stochastic factors like climate fluctuation, forest fire and disease. The combination of recent and historic changes is responsible for the present population size and genetic diversity. Our results suggest that conservation and management practices should strive to maintain this genetic differentiation, specifically by emphasising reforestation efforts with stocks from local provenances to avoid non-local introductions.
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Acknowledgments
We thank Irena M. Naydenova and T&T for their technical assistance. We are grateful to the staff of the Bulgarian forest service for their assistance with the plant material; the Ministry of Education and Science of Bulgaria (EU) for their financial support (CC-318/1993–1996); and the Fond KAZAROVI-Geneva (Switzerland) for a student grant to K. D. Naydenov during an internship at the University of Geneva, Switzerland (Dept. of Botany). We also wish to thank Dan MacKay (CFLS-St-Jean, Qc., Canada) and Translation-Group (UK) for his careful revision of this manuscript.
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Communicated by Jarmo Holopainen.
This article is dedicated to the memory of Prof. Dr. Kosta Kostov from Forest Research Institute, Bulgarian Academy of Science (1924–2009).
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Naydenov, K.D., Mladenov, I., Alexandrov, A. et al. Patterns of genetic diversity resulting from bottlenecks in European black pine, with implications on local genetic conservation and management practices in Bulgaria. Eur J Forest Res 134, 669–681 (2015). https://doi.org/10.1007/s10342-015-0881-3
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DOI: https://doi.org/10.1007/s10342-015-0881-3