Mari Mette Tollefsrud

Norwegian Institute of Bioeconomy Research | NIBIO · Biology and environment

PREFACE (Authored by Michele Bozzano) The genetic makeup of Forest Reproductive Material (FRM) is directly affected by the decisions made by the various actors involved in its production chain. These decisions, which often ignore the genetic perspective, have a major impact on the survival of future forests. There are still gaps and uncertainties i...

Background: Progress in the field of evolutionary forest ecology has been hampered by the huge challenge of phenotyping trees across their ranges in their natural environments, and the limitation in high-resolution environmental information. Findings: The GenTree Platform contains phenotypic and environmental data from 4,959 trees from 12 ecolog...

Motivation: Trait variation within species can reveal plastic and/or genetic responses to environmental gradients, and may indicate where local adaptation has occurred. Here, we present a dataset of rangewide variation in leaf traits from seven of the most ecologically and economically important tree species in Europe. Sample collection and trait a...

Motivation: Trait variation within species can reveal plastic and/or genetic responses to environmental gradients, and may indicate where local adaptation has occurred. Here, we present a dataset of rangewide variation in leaf traits from seven of the most ecologically and economically important tree species in Europe. Sample collection and trait a...

An amendment to this paper has been published and can be accessed via a link at the top of the paper.

Determining the impacts of invasive pathogens on tree mortality and growth is a difficult task, in particular in the case of species occurring naturally at low frequencies in mixed stands. In this study, we quantify such effects by comparing national forest inventory data collected before and after pathogen invasion. In Norway, Fraxinus excelsior i...

The dataset presented here was collected by the GenTree project (EU-Horizon 2020), which aims to improve the use of forest genetic resources across Europe by better understanding how trees adapt to their local environment. This dataset of individual tree-core characteristics including ring-width series and whole-core wood density was collected for...

Seed from orchards, established from breeding programs, often dominate the planting stock in economically important tree species, such as Norway spruce. The genetic diversity in seed orchards’ crops depends on effective population size which in turn is affected by many factors such as: number of parents in the orchard, seed orchards’ design, fecund...

During post glacial colonization, loss of genetic diversity due to leading edge effects may be attenuated in forest trees because of their prolonged juvenile phase, allowing many migrants to reach the colonizing front before populations become reproductive. The northern range margins of temperate tree taxa in Europe are particularly suitable to stu...

Genotypes at six nuclear microsatellite loci for 42 Fraxinus excelsior populations. (XLSX)

Map showing the locations and abbreviated names of the 42 analysed Fraxinus excelsior populations. (TIF)

Pairwise FST values between 42 population samples of Fraxinus excelsior based on six nuclear microsatellite loci. (XLSX)

Results from the bottleneck test. The Wilcoxon test was used under the infinite allele model (IAM), two phase model (TPM) and the stepwise mutation model (SMM). (XLS)

Overview of the nature reserves and the contact persons at the County Governors nature management authorities who issued the permission to collect Fraxinus excelsior in the different locations. (XLSX)

Location, frequency of chloroplast haplotypes and population genetic estimators at nuclear microsatellite data for 42 Fraxinus excelsior populations. (XLSX)

Boreal species were repeatedly exposed to ice ages and went through cycles of contraction and expansion while sister species alternated periods of contact and isolation. The resulting genetic structure is consequently complex and demographic inferences are intrinsically challenging. The range of Norway spruce (Picea abies) and Siberian spruce (Pice...

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Over the past, plant species have persisted through several glacial and interglacial periods. Plants' response was principally migration and adaptation and the plant fossil record shows how fast trees migrated in response to these changes. Migration rates however, seem too high to have been consistently achieved by known plant dispersal mechanisms,...

Aim We used combined palaeobotanical and genetic data to assess whether Norway spruce ( Picea abies ) and Siberian spruce ( Picea obovata ), two major components of the Eurasian boreal forests, occupied separate glacial refugia, and to test previous hypotheses on their distinction, geographical delimitation and introgression. Location The range of...

This literature review gives an overview of the distribution, taxonomy and genetic variations in Norway spruce (Picea abies) as background for evaluating whether native and foreign provenances of Norway spruce in Norway may have different effects on indigenous species and ecosystems according to current knowledge. The modern range of Norway spruce...

We linked hydraulic vulnerability in Norway spruce (Picea abies (L.) Karst.) trunkwood with different cambial age to wood density and applied the findings on annual density variations in healthy and declining trees from southern Norway during 1990 to 2010. We hypothesized that drought stress due to the 2003 or 2006 European heat waves were the trig...

Birks et al. question our proposition that trees survived the Last Glacial Maximum (LGM) in Northern Scandinavia. We dispute their interpretation of our modern genetic data but agree that more work is required. Our field and laboratory procedures were robust; contamination is an unlikely explanation of our results. Their description of Endletvatn a...

Tree Refugia Ideas of how and when boreal plants spread to the formerly glaciated parts of the world following the retreat of the glaciers 9000 years ago are long debated. Models of the postglacial spread of boreal plants argue for dispersal from southern refugia; however, Parducci et al. (p. 1083 ) have shown that both spruce and pine were present...

Seedlings of open-pollinated Picea abies families from Norwegian and Central European parent trees standing at three sites in Norway were tested for timing of bud set at the end of the first growth season together with seedlings from control provenances producing seeds at their geographical origin. The parental origins were confirmed with a materna...

Norway spruce of northern Europe expanded at the end of the last glacial out of one refugium in Russia. To provide a detailed insight into how the genetic structure in the northern European lineage of this species has been shaped by postglacial migration, recurrent pollen flow and marginality, we here compare variation at seven highly variable nucl...

Norway spruce (Picea abies [L.] Karst.) is a broadly distributed European conifer tree whose history has been intensively studied by means of fossil records to infer the location of full-glacial refugia and the main routes of postglacial colonization. Here we use recently compiled fossil pollen data as a template to examine how past demographic eve...

Norway spruce (Picea abies [L.] Karst.) is a broadly distributed European conifer tree whose history has been intensively studied by means of fossil records to infer the location of full-glacial refugia and the main routes of postglacial colonization. Here we use recently compiled fossil pollen data as a template to examine how past demographic eve...

It has been suggested that many arctic-alpine plant species have limited dispersal ability and cannot have arrived in Scandinavia and the arctic archipelago of Svalbard by long-distance dispersal after a total glaciation. It has therefore been proposed that such species must have survived the entire glaciation(s) in ice-free refugia in southern Nor...