Linking ecological and genetic dynamics
Linking ecological and genetic dynamics

Our goals are to increase the knowledge about how eco-evolutionary processes interacts with environmental fluctuations in both time and space to shape the variation in life history strategies that we observe within and among species in nature. This involves examining how spatio-temporal dynamics of vital demographic population characteristics (e.g. population size and density, age-structure, demographic variation, and dispersal) interact with phenotypic variation and evolutionary dynamics, and the role of genetic variation in these interactions. To achieve our goals we combine state-of-the-art genomic tools with development and application of novel statistical methods to analyse individual-based data on fitness-related phenotypic traits, life-history traits, and fitness-components. Our main study systems are several intensively studied natural vertebrate populations, including house sparrows, water voles and arctic foxes. We also provide molecular genetic resources and assistance needed by other research groups at CBD. Furthermore, the empirical individual-based data on phenotypic traits, fitness, and genetic variation we produce is, along with results from our studies: 1) needed to parameterize and test models developed by other research groups at CBD; 2) attractive for scientists who wish to use our unique data in international and national collaborative projects that test hypotheses and answer questions in various fields in biology.
Current research
Mechanisms that link ecological and evolutionary processes: By identifying and studying fitness related traits in time and space, we aim to increase our understanding of how life history characters affect population dynamics, and how selection may result in evolutionary change in fluctuating environments.
Effects of dispersal and population characteristics such as population size on genetic variation: We study what factors affect the distribution of genetic variation within and between populations, and thereby contribute to a better understanding of evolutionary processes and the viability of endangered populations.
The relative importance of genes and environment for phenotypic variation: We develop methods to obtain precise and unbiased estimates of the relative importance of genes and environment for variation in phenotypic characters. These methods are used on empirical data from natural populations to predict the rate and direction of adaptive evolutionary change in fluctuating environments.
The genetic basis of ecologically important characters: By identifying the genetic basis of traits involved in adaptation, we aim to improve our understanding of how processes at the molecular level relate to processes at the phenotypic level.


Who are we?
Arild Husby: Has broad interests in the fields of ecological genetics and genomics, and is particularly interested in how changing environmental conditions impact genetic variation (has a shared employment at CBD and Helsinki University http://blogs.helsinki.fi/husby/).
Henrik Jensen: Focuses on questions in the intersection between genetics, evolution, ecology and conservation biology. For example, how do changes in the environment caused by human activities affect eco-evolutionary dynamics?
Alina Niskanen: Postdoc who applies genomic methods and uses unique long-term fitness data on house sparrows to study inbreeding and inbreeding depression.
Stig W. Omholt: Interested in a wide range of questions in evolutionary biology, and in particular issues involving the genotype-phenotype map.
Thor Harald Ringsby: Seeks to understand how fluctuations in abiotic and biotic factors interact with eco-evolutionary mechanisms and shape spatio-temporal variation in life-history strategies and abundances within species.
Ingelin Steinsland: Aims to develop statistical methods and knowledge to solve problems in applied science, such as for example models and methods to analyse large datasets in quantitative genetics.
Ingerid J. Hagen: Researcher interested in genetics and genomics of natural vertebrate populations, and in particular those under threat from anthropogenic activities. Currently employed at NINA.
Henrik Pärn: Senior engineer responsible for water vole research.
Bernt Rønning: Senior engineer responsible for house sparrow research.
PhD projects
Current
- Sarah Lundregan (PhD, starts July 2017): The roles of genetic variation, plasticity and epigenetics in connecting inbreeding depression, host-parasite interactions, and telomeric integrity.
- Michael P. Pedersen (PhD): The functional relationships between telomere dynamics and variation in life-history traits and population fluctuations in house sparrows.
- Maria Selle (PhD): Knowledge-based non-stationary modelling in quantitative genetics.
- Dilan Saatoglu (PhD): Genetic dynamics in time and space in a natural house sparrow metapopulation.
- Sindre Sommerli (PhD): Demographic and genetic dynamics in a water vole metapopulation.
- Peter S. Ranke (PhD): Causes and consequences of dispersal.
Previous
- Håkon Holand (PhD): Spatio-temporal variation in parasite prevalence, and effects of parasites on host fitness in a house sparrow metapopulation.
Master projects
Current
- Mari Krogfjord: Maternal investment in egg volume and its consequences for reproductive success in house sparrows.
- Cathrine Thurmann-Nielsen: Effects of nest temperature and humidity on fitness in house sparrows.
- Marte Jakobsen: Spatio-temporal variation in fledgling haemoglobin concentration and its relationship with individual condition in house sparrow.
- Liv Rud-Johansen: Genes associated with litter size in Scandinavian arctic fox.
- Trond Arne Stenersen: Sex-biased dispersal in the water vole.
- Sarah Lundregan: Genes for ecologically important traits in house sparrows: ALX1 and bill morphology.
- Ida Pernille Ø. Andersskog: The effects of management actions on effective population size in the Scandinavian arctic fox metapopulation.
- Kristina Johansen: Effects of spatio-temporal climatic variation on reproductive success in house sparrows.
- Elisa J. K. Hemphill: Genetic consequences of conservation management in the Scandinavian arctic fox.
Selected publications
Stronen, A. V., Salmela, E., Baldursdottir, B. K., Berg, P., Espelien, I. S., Järvi, K., Jensen, H., Kristensen, T. N., Melis, C., Manenti, T., Lohi, H. and Pertoldi, C. 2017. Genetic rescue of an endangered domestic animal through outcrossing with closely related breeds: A case study of the Norwegian Lundehund. PLoS One 12: e0177429.
Kvalnes, T., Ringsby, T.H., Jensen, H., Hagen, I.J., Rønning, B., Pärn, H., Holand, H., Engen, S. and Sæther, B.-E. 2017. Reversal of response to artificial selection on body size in a wild passerine. Evolution, In press.
Silva, C. N. S., McFarlane, S. E., Hagen, I. J., Rönnegård, L., Billing, A. M., Kvalnes, T., Kemppainen, P., Rønning, B., Ringsby, T. H., Sæther, B.-E., Qvarnström, A., Ellegren, H., Jensen, H. & Husby, A. 2017. Insights into the genetic architecture of natural and sexually selected morphological traits in two passerine bird species. Heredity, in press.
Elgvin, T. O., Trier, C. N., Tørresen, O. K., Hagen, I. J., Lien, S., Nederbragt, A. J., Ravinet, M., Jensen, H. & Sætre, G.-P. 2017. The genomic mosaicism of hybrid speciation. Science Advances: in press.
Gjuvsland, A.B., Zörgö, E., Samy, J.K., Stenberg, S., Demirsoy, I.H., Roque, F., Maciaszczyk-Dziubinska, E., Migocka, M., Alonso-Perez, E., Zackrisson, M., Wysocki, R., Tamás, M.J., Jonassen, I., Omholt, S.W. and Warringer, J. 2016. Disentangling genetic and epigenetic determinants of ultrafast adaptation. Molecular Systems Biology 12, 892.
Holand, H., Kvalnes, T., Gamelon, M., Tufto, J., Jensen, H., Pärn, H., Ringsby, T.H. and Sæther, B.-E. 2016. Spatial variation in senescence rates in a bird metapopulation. Oecologia 181, 865–871.
Husby, A., Kawakami, T., Rönnegård, L., Smeds, L., Ellegren, H. and Qvarnström, A. 2015. Genome-wide association mapping in a wild avian population identifies a link between genetic and phenotypic variation in a life history trait. Proceedings of the Royal Society series B 282: 20150156.
Kemppainen, P., Rønning, B., Kvalnes, T., Hagen, I.J., Ringsby, T.H., Billing, A.M., Pärn, H., Lien, S., Husby, A., Sæther, B.-E. and Jensen, H. 2016. Controlling for p-value inflation in allele frequency change in experimental evolution and artificial selection experiments. Molecular Ecology Resources, in press.
Ranke, P.S., Skjelseth, S., Pärn, H., Herfindal, I., Pedersen, Å.A.B., Stokke, B.G., Kvalnes, T., Ringsby, T.H., Sæther, B.-E. and Jensen, H. 2017. Demographic influences of translocated individuals on a resident population of house sparrows. Oikos, In press.
Ringsby, T.H., Jensen, H., Pärn, H., Kvalnes, T., Boner, W., Gillespie, R., Holand, H., Hagen, I.J., Rønning, B., Sæther, B.-E. and Monaghan, P. 2015. On being the right size: increased body size is associated with reduced telomere length under natural conditions. Proceedings of the Royal Society of London B 282, 20152331
Rønning, B., Broggi, J., Bech, C., Moe, B., Ringsby, T.H., Pärn, H., Hagen, I.J., Sæther, B.-E. and Jensen, H. 2016. Is basal metabolic rate associated with recruit production and survival in free-living house sparrows? Functional Ecology 30, 1140–1148.
Stubberud, M.W., Myhre, A.M., Holand, H., Kvalnes, T., Ringsby, T.H., Sæther, B.-E. and Jensen, H. 2017. Sensitivity analysis of effective population size to demographic parameters in house sparrow populations. Molecular Ecology, In press.