8 Works

Data from: Can we rely on selected genetic markers for population identification? evidence from coastal Atlantic cod

Per Erik Jorde, Ann-Elin Synnes, Sigurd Heiberg Espeland, Marte Sodeland & Halvor Knutsen
The use of genetic markers under putative selection in population studies carries the potential for erroneous identification of populations and misassignment of individuals to population of origin. Selected markers are nevertheless attractive, especially in marine organisms that are characterized by weak population structure at neutral loci. Highly fecund species may tolerate the cost of strong selective mortality during early life stages, potentially leading to a shift in offspring genotypes away from the parental proportions. In...

Data from: Stable coexistence of genetically divergent Atlantic cod ecotypes at multiple spatial scales

Halvor Knutsen, Per Erik Jorde, Jeffrey A. Hutchings, Jakob Hemmer-Hansen, Peter Grønkjær, Kris-Emil Mose Jørgensen, Carl Andre, Marte Sodeland, Jon Albretsen, Esben M. Olsen & Peter Grønkjaer
Coexistence in the same habitat of closely related yet genetically different populations is a phenomenon that challenges our understanding of local population structure and adaptation. Identifying the underlying mechanisms for such coexistence can yield new insight into adaptive evolution, diversification, and the potential for organisms to adapt and persist in response to a changing environment. Recent studies have documented cryptic, sympatric populations of Atlantic cod (Gadus morhua) in coastal areas. We analyzed genetic origin of...

Data from: Personalities influence spatial responses to environmental fluctuations in wild fish

David Villegas‐Ríos, Denis Réale, Carla Freitas, Even Moland & Esben M. Olsen
1. Although growing evidence supports the idea that animal personality can explain plasticity in response to changes in the social environment, it remains to be tested whether it can explain spatial responses of individuals in the face of natural environmental fluctuations. This is a major challenge in ecology and evolution as spatial dynamics link individual- and population-level processes. 2. In this study we investigated the potential of individual personalities to predict differences in fish behaviour...

Data from: Fine-scale population differences in Atlantic cod reproductive success: a potential mechanism for ecological speciation in a marine fish

Nancy E. Roney, Rebekah A. Oomen, Halvor Knutsen, Esben M. Olsen & Jeffrey A. Hutchings
Successful resource-management and conservation outcomes ideally depend on matching the spatial scales of population demography, local adaptation, and threat mitigation. For marine fish with high dispersal capabilities, this remains a fundamental challenge. Based on daily parentage assignments of more than 4000 offspring, we document fine-scaled temporal differences in individual reproductive success for two spatially adjacent (<10km) populations of a broadcast-spawning marine fish. Distinguished by differences in genetics and life history, Atlantic cod (Gadus morhua) from...

Data from: Mechanisms of reciprocity and diversity in social networks: a modelling and comparative approach

Ivan Puga-Gonzalez, Julia Ostner, Oliver Schülke, Sebastian Sosa, Bernard Thierry & Cedric Sueur
Three mechanisms have been proposed to underlie reciprocation of social behaviors in gregarious animals: ‘calculated reciprocity’, ‘emotional bookkeeping’ and ‘symmetry-based reciprocity’. Among these explanations, emotional book-keeping has received the broadest support from experimental and observational studies. On the other hand, three individual-based models have shown that reciprocation may emerge via ‘symmetry-based reciprocity’, ‘emotional bookkeeping’, or a combination of both mechanisms. Here we use these three models to assess their relative fit with empirical data on...

Data from: Harvesting changes mating behavior in European lobster

Tonje K. Sørdalen, Kim T. Halvorsen, Hugo B. Harrison, Charlie D. Ellis, Leif Asbjørn Vøllestad, Halvor Knutsen, Even Moland & Esben M. Olsen
Removing individuals from a wild population can affect the availability of prospective mates and the outcome of competitive interactions, with subsequent effects on mating patterns and sexual selection. Consequently, the rate of harvest-induced evolution is predicted to be strongly dependent on the strength and dynamics of sexual selection yet, there is limited empirical knowledge on the interplay between selective harvesting and the mating systems of exploited species. In this study, we used genetic parentage assignment...

Data from: Disentangling structural genomic and behavioral barriers in a sea of connectivity

Julia M. I. Barth, David Villegas-Ríos, Carla Freitas, Even Moland, Bastiaan Star, Carl André, Halvor Knutsen, Ian Bradbury, Jan Dierking, Christoph Petereit, David Righton, Julian Metcalfe, Kjetill S. Jakobsen, Esben M. Olsen, Sissel Jentoft & Julia M.I. Barth
Genetic divergence among populations arises through natural selection or drift and is counteracted by connectivity and gene flow. In sympatric populations, isolating mechanisms are thus needed to limit the homogenizing effects of gene flow to allow for adaptation and speciation. Chromosomal inversions act as an important mechanism maintaining isolating barriers, yet their role in sympatric populations and divergence with gene flow is not entirely understood. Here, we revisit the question whether inversions play a role...

Data from: Potential of a no-take marine reserve to protect home ranges of anadromous brown trout (Salmo trutta)

Susanna H. Thorbjørnsen, Even Moland, Colin Simpfendorfer, Michelle Heupel, Halvor Knutsen & Esben M. Olsen
1. The extent to which no‐take marine reserves can benefit anadromous species requires examination. 2. Here, we used acoustic telemetry to investigate the spatial behavior of anadromous brown trout (sea trout, Salmo trutta) in relation to a small marine reserve(~1.5 km2) located inside a fjord on the Norwegian Skagerrak coast. 3. On average, sea trout spent 42.3 % (±5.0% SE) of their time in the fjord within the reserve, a proportion similar to the area...

Registration Year

  • 2018

Resource Types

  • Dataset


  • University of Agder
  • Norwegian Institute of Marine Research
  • University of Oslo
  • University of Gothenburg
  • James Cook University
  • Sun Yat-sen University
  • Centre national de la recherche scientifique
  • Aarhus University
  • Dalhousie University
  • Hubert Curien Multi-disciplinary Institute