Main scientific interests and areas
- Stoichiometric principles
from genes to ecosystems. I.e. how elements like carbon, nitrogen and
phosphorus and elemental ratios regulates RNA-content, RNA:DNA-ratios
and growth rates in organisms, trophic transfer efficiency in food webs
and biogeochemical cycling of these key elements. Starting off from
the favourite lab pet
Daphnia, these studies now include various taxa (C. elegans, Drosophila, collebola, rotifers)
- Genome size evolution in organisms and the link between genome size, growth and metabolism accross phyla.
- Carbon flux and sequestration in individuals and ecosystems, linked with stoichiometry and climate change.
- UV-radiation, ozone depletion and effects on alpine and Arctic ecosystems.
- The role of polyploidy (multiple chromosome copies) for life cycle strategies, genetic diversity and speciation.
- Patterns and causes of species diversity within lakes, focussing phyto- and zooplankton.
- Ecology and evolutionary biology in general, environmental issues and
the philosophical implications of biology in general and evolutionary
aspects in particular.
students, PhDs and post.docs: There are possibilities for interesting
topics of research and ongoing projects, both at various field sites
(including the high Arctic), lab experiments and more theoretical
studies and lab experiments. My work is mostly performed at
Biological Institute at University of Oslo, where I am affiliated as
core member at Center for Ecological and Evolutionary Synthesis (http://www.cees.no/). A general presentation of my research group and activities is given at: http://www.bio.uio.no/akv/ansatte/biografi/hessen_Dag.html.
For those with their interest devoted to science, an updated (more or less)
list of books, publications and some more general scientific writings and merits
in my CV.
News, comments and current topics (a semi-blog, including some recent writings, popular stuff and media, mostly in Norwegian): look here