5 Works

Time-series covering up to four decades reveals major changes and drivers of marine growth and proportion of repeat spawners in an Atlantic salmon population

Alison Harvey, Øystein Skaala, Reidar Borgstrøm, Per Tommy Fjeldheim, Kaja Fjeldheim, Kjell Utne, Ingrid Johnsen, Peder Fiske, Synne Winterthun, Sofie Knutar, Harald Sægrov, Kurt Urdal & Kevin Glover
1. Wild Atlantic salmon populations have declined in many regions and are affected by diverse natural and anthropogenic factors. To facilitate management guidelines, precise knowledge of mechanisms driving population changes in demographics and life history traits is needed. 2. Our analyses were conducted on a) age and growth data from scales of salmon caught by angling in the river Etneelva, Norway, covering smolt year classes from 1980 to 2018, b) extensive sampling of the whole...

Strategies to Mitigate Enteric Methane Emissions by Ruminants

C. Arndt, A.N. Hristov, W.J. Price, S.C. McClelland, A.M. Pelaez, A.R. Bayat, L.A. Crompton, J. Dijkstra, M.A. Eugène, D. Enahoro, E. Kebreab, M. Kreuzer, M. McGee, C. Martin, C.J. Newbold, C.K. Reynolds, A. Schwarm, K.J. Shingfield, J.B. Veneman, D.R. Yáñez-Ruiz & Z. Yu
To meet the 1.5°C target, methane (CH4) from ruminants must be reduced by 11 to 30% of the 2010 level by 2030 and by 24 to 47% by 2050. A meta-analysis identified strategies to decrease product-based [PB; CH4 per unit meat or milk (CH4I)] and absolute (ABS) enteric CH4 emissions while maintaining or increasing animal productivity (AP; weight gain and milk yield). Next the potential of different adoption rates of one PB and/or ABS strategies...

A test of frequency dependent selection in the evolution of a generalist phenotype

Stephanie Blain, Louise Chavarie, Mackenzie Kinney & Dolph Schluter
A solitary population of consumers frequently evolves to the middle of a resource gradient and an intermediate mean phenotype compared to a sympatric pair of competing species that diverge to either side via character displacement. The forces governing the distribution of phenotypes in these allopatric populations, however, are little investigated. Theory predicts that the intermediate mean phenotype of the generalist should be maintained by negative frequency dependent selection, whereby alternate extreme phenotypes are favored because...

Fungal OTUs during dead wood succession of aspen

Lisa Lunde
During decomposition of organic matter, microbial communities may follow different successional trajectories depending on the initial environment and colonizers. The timing and order of the assembly history can lead to divergent communities through priority effects. We explored how assembly history and substrate quality affected fungal dead wood communities and decomposition, 1.5 and 4.5 years after tree felling. In addition, we investigated the effect of invertebrate exclusion during the first two summers. For aspen (Populus tremula)...

Phenotypic plasticity and genetic diversity in a polyploid Arabidopsis complex

Siri Fjellheim, Torbjørn Kornstad & Mikael Ohlson
Polyploid species possess more than two sets of chromosomes and may show high gene redundancy, hybrid vigor and masking of deleterious alleles compared to their parent species. Following this, it is hypothesized that this makes them better at adapting to novel environments than their parent species, possibly due to phenotypic plasticity. The allopolyploid Arabidopsis suecica and its parent species A. arenosa and A. thaliana were chosen as a model system to investigate relationships between phenotypic...

Registration Year

  • 2022
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Affiliations

  • Norwegian University of Life Sciences
    5
  • National Research Institute for Agriculture, Food and Environment
    1
  • Estación Experimental del Zaidín
    1
  • The Ohio State University
    1
  • International Livestock Research Institute
    1
  • Natural Resources Institute Finland
    1
  • University of Idaho
    1
  • Colorado State University
    1
  • National Research Development Institute for Animal Biology and Nutrition
    1
  • University of British Columbia
    1