Gonyostomum chloroplast genome

Former lab member Ingrid Sassenhagen just published our paper on the Gonyostomum semen chloroplast genome in a special volume in Genes. This work was done using whole-genome amplification from a few isolated chloroplasts, thereby circumventing having to culture cells. Please see:

Special Issue:
Posted in Publications

Postdoctoral position available

Project description

Microscopic organisms are widespread and many species have a cosmopolitan distribution. This pattern suggests that microorganisms (such as phytoplankton), in contrast to most larger organisms, have unlimited dispersal. Unlimited dispersal implies high migration rates and gene flow within a species, and consequently no opportunity for populations to differentiate. However, many studies show that phytoplankton populations are genetically highly differentiated. This implies limited gene flow despite high dispersal, posing a dispersal–differentiation paradox. Explanations to this paradox may include the importance of founding individuals (founder effects), and rapid local adaptation in phytoplankton. Within this project we will experimentally test these hypotheses using a model green algal system.

The postdoctoral fellow will be involved in the research on the dispersal-differentation paradox in phytoplankton, utilizing the model species Chlamydomonas. The project encompasses both experimental laboratory studies as well as some field work. The postdoctoral fellow will be responsible for experimental work testing founder effects and local adaptation in Chlamydomonas populations. The work will include algal culturing, PCR, and preparation of RADseq libraries, in the laboratory. Downstream analyses will include bioinformatic analyses, population genetic analyses, as well as writing manuscripts. The postdoctoral fellow is expected to conduct high quality research and to disseminate results in international scientific publications.

For more information follow the link below and/or contact Karin Rengefors.

Application deadline: 6 March 2019

Procedure: Go to Postdoctoral fellow in Biology, PA2019/75

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Gonyostomum in Cedar Swamp, Woods Hole

In a paper 1935, Drouet and Cohen, described that they had found the rarely observed flagellate Gonyostoum semen in a sphagnum swamp in Woods Hole, Massachusetts, USA. This locality is referred to by residents as the Cedar Swamp. This year we managed to enter the swamp, find the open water, and resample. Just as in 1934, there was a major bloom of Gonyostomum, dominated the phytoplankton community entirely! The next step is comparative analyses to European populations.


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2018 field sampling

This summer we will have two major field sampling campaigns going on. One is here in southern Sweden, in lakes Ringsjön and Vombsjön. The project is focused on the seasonal dynamics of toxin and non-toxin producing strains of the cyanobacterium Microcystis botrys, and is part of Emma Johansson’s PhD project.  The second field sampling expedition will be across the U.S. This sampling is part of Raphael Gollnisch’s PhD project, and is focused on collecting samples of the invasive nuisance raphidophyte Gonyostomum semen. Fingers crossed that both sampling campaigns will be successful!ringsjön


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New project on phytoplankton resilience and evolution

Together with Dr. Anna Godhe (PI), my colleagues Drs. Olof Berglund, Helena Filipsson, and I, were funded to work on phytoplankton resilience and evolution in response to pollution. The project, entitled Live to tell: Have phytoplankton evolved in response to environmental pollution during the last centuries? is funded by the Research Council Formas.

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Another new PhD student

I would like to welcome Raphael Gollnisch, a new PhD student to our group. Raphael will be working with the invasive freshwater species Gonyostomum semen, investigating the underlying differences between expanding and non-expanding lineages. He will utilize single-cell genome amplification approach in combination with population genomic analyses. Raphael is part of the Marie Curie ITN SINGEK.

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Welcome to new PhD student

I would like to welcome our new member Emma Johansson to my lab. Emma will be working on her PhD on population genomics of the toxic cyanobacterium Microcystis botrys. The focus of her PhD project is to try and understand the dynamics and spatial structure of micocystin and non-microcystin producing subpopulations.

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