(Icelandic) Eru virkilega til hættuleg afbrigði veirunnar sem veldur COVID-19?

Arnar Pálsson, 15/04/2020

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(Icelandic) Eru til tvö eða fleiri afbrigði af kórónuveirunni sem veldur COVID-19?

Arnar Pálsson, 15/04/2020

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(Icelandic) Hvort er líklegra að veiran sem veldur COVID-19 verði hættulegri eða hættuminni fyrir menn vegna stökkbreytinga?

Arnar Pálsson, 15/04/2020

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(Icelandic) Getur kórónuveiran sem veldur COVID-19 stökkbreyst og orðið hættulegri?

Arnar Pálsson, 15/04/2020

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(Icelandic) Stökkbreytist veiran sem veldur COVID-19 hraðar en aðrar RNA-veirur?

Arnar Pálsson, 24/03/2020

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(Icelandic) Stökkbreytast veirur hraðar en flóknar lífverur?

Arnar Pálsson, 24/03/2020

covid 19 genetics and evolution background for Icelandic public.

(Icelandic) Hvaðan kom COVID-19 veiran?

Arnar Pálsson, 24/03/2020

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(Icelandic) Geta lífverur þróast í stökkum vegna stökkbreytinga?

Arnar Pálsson, 24/03/2020

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Plastic charr at Oikos 2020

Arnar Pálsson, 12/03/2020

Sarah E. Steele presented her work in the Oikos meeting last week.

Mechanisms and axes of developmental plasticity and evolutionary divergence. Sarah Steele, Dagný Runarsdottir, Bjarni Kristjansson, Skuli Skulason, Prof Camille Leblanc, Sigridur R. Franzdottir, Zophonias Jonsson, Sigurdur Snorrason, Arnar Palsson.

Why are some species plastic and capable of rapid phenotypic diversification and polymorphism, while others are less flexible at the phenotype level and evolve more slowly? This question has puzzled geneticist and students of evolution for over a century, but new technologies have made it addressable. Here we set out to investigate the developmental and genetic basis of plasticity and polymorphism, applying experimental and molecular methods on the extremely diverse salmonid, Arctic charr (Salvelinus alpinus). Arctic charr has, in about 10,000 years following the ice age glacier retreat, invaded and adapted to diverse habitats, and in the process small benthic forms evolved in dozens of locations. Arctic charr is phenotypically very heterogeneous, to the extent that morphotypes were originally classified as distinct species, but also show high levels of phenotypic plasticity. We use a combination of genetic crosses, geometric morphometrics and next generation sequencing to characterize the plastic response to benthic or limnetic food. We compared wild stocks and their hybrids, reared in the laboratory, after hatching and while the juveniles are taking food. The results illuminate how we understand of the relationship of ecologically induced developmental plasticity and evolution of ecological specializations.

 

Marion Dellinger also presented data on behavioral phenotypes of the fishes from this experiment.

Tell me how you eat, I'll tell you who you are: how does feeding modalities affect personality distribution in the Arctic charr (Salvelinus alpinus)?

The Icelandic biology conference 2019

Arnar Pálsson, 22/01/2020

Late last year the lab took part in the Icelandic biology conference. The conference is biannual, and the largest aggregation of biological researchers in Iceland.

Our lab contributed several works to the meeting, and Im very proud of the students for their contributions.

Here is a list of the projects that they presented:

Can you save a mutant? Expressional rescue of 3 major wing defects in Drosophila melanogaster Baldur Kristjánsson, Dagný Á. Rúnarsdóttir, Sudarshan Chari, Ian Dworkin, Arnar Pálsson

Waddingtons landscapes explored: Expression changes associated with genetic assimilation of crossveinless phenotypes Dagný Ásta Rúnarsdóttir, Baldur Kristjánsson, Sarah Marzec, Ian Dworkin, Arnar Pálsson

Study of the genetic and developmental basis of phenotypic differences between sympatric Arctic charr (Salvelinus alpinus) morphs Nahal Eskafi, Alexander Guðjónsson, Sylvain Moinard, Lea J. Plesec, Sigurður S. Snorrason, Zophonias O. Jonsson, Arnar Palsson, Sigríður Rut Franzdóttir

Differential expression of transcription factors between Arctic charr morphsLea Jerman Plesec, Alexander Guðjónsson, Sébastien Matlosz, Jóhannes Guðbrandsson, Arnar Pálsson, Sigríður Rut Franzdóttir, Zophonías O. Jónsson