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Query: "author" (Gregor Božič) .

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Continental-wide population genetics and post-Pleistocene range expansion in field maple (Acer campestre L.), a subdominant temperate broadleaved tree species
Eric Wahlsteen, Evangelia V. Avramidou, Gregor Božič, Rida Mohammed Mediouni, Bernhard Schuldt, Halina Sobolewska, 2023, original scientific article

Abstract: Acer campestre L. is a rarely silviculturally managed and poorly investigated European tree species which forms seminatural populations and can thus be considered as a model tree for studying post glacial colonisation and phylogeography. Herein, we studied the genetic structure of Acer campestre L. in order to investigate population and genetic diversity clines over the distribution range and for synthesizing the results into a post-Pleistocene range expansion hypothesis. We characterised the genetic diversity and population structure of 61 Acer campestre populations using 12 microsatellite markers. The three detected gene pools are structured geographically creating a longitudinal pattern corresponding with their proposed refugial origin. The results indicated a longitudinal population cline with three strong but highly admixed gene pools. Based on the possible signal from the structure results, a number of phylogeographic dispersal hypotheses were tested using approximate Bayesian computation, and this analysis supported the three refugia scenario with a simultaneous divergence prior to the last glacial maximum. Acer campestre shows a typical decrease in population diversity with northern and western distribution and signatures of surfng alleles in the western expansion axis in 2% of the included alleles. Acer campestre exhibits a high degree of admixture among populations and typical signatures of isolation by distance with no naturally delimited subpopulations. The population structure is rather impacted by geographically, than climatologically means with surfng alleles and alleles strongly limited to geographical areas. Our data also suggest that the population structure still today harbours signatures of post glacial migrations from Mediterranean as well as northern glacial refugia.
Keywords: allele surfing, Bayesian inference, glacial refugia, nuclear SSR, sliding window
Published in DiRROS: 07.03.2023; Views: 58; Downloads: 30
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ZaDravo : projektna naloga - sklop B
Gregor Božič, 2022, final research report

Keywords: smernice, svetovanje, gozdni habitatni tip, HT91E0*, revitalizacija gozdnega habitatnega tipa, Drava, Slovenija, poročila
Published in DiRROS: 19.12.2022; Views: 131; Downloads: 0

ZaDravo : projektna naloga - sklop B
Gregor Božič, 2022, final research report

Keywords: smernice, dolgoročna revitalizacija, gozdni habitatni tip, HT91E0*, gozdni reprodukcijski material, Drava, Slovenija, poročila
Published in DiRROS: 16.12.2022; Views: 160; Downloads: 41
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The status and role of genetic diversity of trees for the conservation and management of riparian ecosystems : a European experts' perspective
Filip Alimpić, Jelena Milovanović, Remigiusz Pielech, Georgi Hinkov, Roland Jansson, Simon Dufour, Marcin Beza, Nebi Bilir, Luis Santos del Blanco, Gregor Božič, 2022, original scientific article

Abstract: Riparian vegetation supports high biodiversity providing many services and is, therefore, an important landscape element. Riparian ecosystems are subject to numerous pressures leading to population decline and genetic erosion of riparian plants. This may have cascading effects at various ecosystem levels, including decreasing ecosystem services, so identifying the current status of genetic diversity of riparian tree species is vital to improve the effectiveness of restoration efforts. We aimed to elicit expert views on the status and importance of genetic diversity of tree species, and conservation needs across European riparian ecosystems. Sharing of such information among researchers, managers and policymakers has the potential to enhance ecological restoration and management of riparian ecosystems. We identified experts in riparian genetic resources conservation and management across Europe. These included stakeholders with different perspectives, ranging from researchers to practitioners. We designed a set of questionnaires where our identified experts were asked to answer questions related to the status and conservation of genetic diversity of riparian tree species in their respective countries. Specifically, we asked about societal awareness, legislative tools, good practices and conservation or restoration projects accounting for intraspecific genetic diversity and differentiation of tree species in riparian ecosystems. Questionnaire responses were analysed and discussed in light of the scientific literature to define needs and priorities related to the management and conservation of genetic diversity of riparian tree species. The experts recognized that a combination of in situ and ex situ measures and/or integrative conservation of riparian ecosystems is the most appropriate option for conserving the genetic diversity of riparian tree species. Simultaneous application of conservation measures at the level of priority species, identified by experts, and protection of riparian areas are required. Synthesis and applications. This study revealed the importance of recognizing the ecological processes that shape the genetic diversity of riparian tree species in hydrographic networks (dendritic spatial configuration, specific patterns of gene flow among riparian populations, fragmentation of river by dams) but also the need to overcome socio-economic barriers, such as lack of policy priority, deficiency in funding and weak legislation framework.
Keywords: biodiversity conservation, genetic erosion, genetic resources conservation, knowledge transfer, management, riparian genetic diversity, vegetation
Published in DiRROS: 08.12.2022; Views: 146; Downloads: 80
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Rast in kakovost metasekvoje (Metasequoia glyptostroboides Hu et Cheng) v živem arhivu pri Ljubljani
Iza Petek, Gregor Božič, Dušan Jurc, Kristjan Jarni, Robert Brus, 2022, original scientific article

Abstract: Analizirali smo živi arhiv metasekvoje (Metasequoia glyptostroboides Hu et Cheng) na obrečnem rastišču ob Savi pri Ljubljani. Osnovan je bil v letih 1993 in 1994 s sadikami, vzgojenimi iz originalnih semen z območja na Kitajskem, kjer je bila vrsta opisana (klasično nahajališče oz. locus classicus). Drevesa v nasadu so bila prvič izmerjena spomladi leta 2000 in nato še leta 2006, spomladi v letu 2020 pa smo meritve ponovili. V starosti 30 let je povprečno drevo merilo v višino 20,7 m, povprečni premer koreninskega vratu na višini debla 0,1 m je znašal 72,3 cm, povprečni premer debla na prsni višini pa 51,4 cm. Ugotovili smo, da je pogostnost reproduktivnih organov, torej storžev in moških cvetov, povezana s premerom in višino drevesa. Užlebljenost debla je zelo variabilna in povezana s premerom, zelo variabilno je tudi zmanjšanje premera z višino. Povezave med omenjenimi znaki in lego drevesa v nasadu nismo ugotovili. Svetloba oziroma lega v nasadu ni edini dejavnik, ki vpliva na lastnosti posameznega drevesa, vzrok je tudi genetska variabilnost med drevesi.
Keywords: Metasequoia glyptostroboides, semenski nasad, rast, kakovost, Slovenija
Published in DiRROS: 11.08.2022; Views: 323; Downloads: 107
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