Karin S L Johansson

Karin S L Johansson
University of Gothenburg | GU · Department of Biological & Environmental Sciences

PhD

About

9
Publications
1,982
Reads
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112
Citations
Additional affiliations
May 2017 - present
University of Tartu
Position
  • PostDoc Position
February 2014 - November 2016
University of Gothenburg
Position
  • PostDoc Position
June 2008 - June 2013
Swedish University of Agricultural Sciences
Position
  • PhD Student
Education
June 2008 - June 2013
January 2005 - May 2008
University of Gothenburg
Field of study
  • Biology

Publications

Publications (9)
Article
Full-text available
Background and aims: The stomatal conductance (gs) of most plant species decreases in response to elevated atmospheric CO2 concentration. This response could have a significant impact on plant water use in a future climate. However, the regulation of the CO2-induced stomatal closure response is not fully understood. Moreover, the potential genetic...
Article
Full-text available
A number of marine and freshwater harmful algal bloom (HAB) species have colonized new areas and expanded their habitat range in recent years. Nevertheless it is notoriously difficult to establish when colonization first occurred, what the dispersal routes are, and to separate recent invasion from increases in existent but small populations. The fr...
Article
Physical defenses and grazer avoidance of the bloom-forming microalga Gonyostomum semen may reduce the direct coupling between phytoplankton and higher trophic levels and result in an increased importance of alternative basal food resources such as bacteria and heterotrophic protozoans. To assess the importance of algal and heterotrophic food resou...
Article
Full-text available
Stomata are small pores in the surface of plant leaves, balancing the uptake of CO2 against the loss of water vapour. As drought stress is projected to increase in many parts of the world, an improved understanding of how plants regulate their stomata in response to environmental stimuli may have important implications for securing food production...
Article
Full-text available
Here, we use a novel space-by-time approach to study large-scale changes in phytoplankton species distribution in Swedish boreal lakes in response to climate variability. Using phytoplankton samples from 27 lakes, evenly distributed across Sweden, all relatively unimpacted by anthropogenic disturbance and sampled annually between 1996 and 2010, we...
Article
We examined changes in G. semen occurrence and bloom incidence in 146 boreal lakes in Sweden sampled at least once between 1992 and 2010, and used a time-by-space model to assess the environmental variables that best explain patterns in G. semen distribution and bloom formation. We showed that G. semen has become more common, although there were n...
Article
Full-text available
Blooms of the nontoxic raphidophyte Gonyostomum semen have shown a recent increase in frequency and distribution in the Fennoscandian region. Due to large cell size and several grazer-avoidance strategies, G. semen is hypothesized to be inedible for most zooplankton species and therefore may constitute a bottleneck for the transfer of energy and nu...
Article
Full-text available
The large bloom-forming flagellate Gonyostomum semen has been hypothesized to be inedible to naturally occurring zooplankton due to its large cell size and ejection of long slimy threads (trichocysts) induced by physical stimulation. In a grazing experiment using radiolabelled algae and zooplankton collected from lakes with recurring blooms of G. s...

Questions

Question (1)
Question
I am working on a meta-analysis using log response ratios. In one of the primary studies the results are presented as raw response ratios with associated standard errors. How can I calculate the variance of the log response ratio from the SE of the raw response ratio?
Attempts to acquire the raw data from the author of the primary study have not been successful.

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Cited By

Projects

Project (1)
Project
The aim of this project is to investigate the genetic variation underlying differences in the regulation of stomatal conductance among natural accessions (ecotypes) of the model plant Arabidopsis thaliana. The main focus is on the stomatal closure response to elevated CO2 concentration, but I am also interested in the genetic regulation of stomatal density.