Biocryomorphic evolution on the Greenland Ice Sheet

Our new paper, “Metabolome induced biocryomorphic evolution promotes carbon fixation in Greenlandic cryoconite holes” came out this week. The main finding is that cryoconite holes can change their shape in three dimensions to maintain comfortable conditions for microbial life – an example of biocryomorphology in action. Here’s a summary of the main points:

  1. Cryoconite holes change their shape and size according to environmental conditions. A mechanism for this, driven by nonuniform arrangement of cryoconite granules or receipt of solar radiation, is presented.
  2. Changes in hole shape are accompanied by changes in metabolic processes in microbial communities on the hole floors
  3. Cryoconite systems tend to evolve towards wide, flat floored shapes where cryoconite granules are spread out and able to photosynthesise more. This means cryoconite holes naturally maintain conditions conducive to capturing carbon.
  4. When these equilibrium states are disturbed, the microbes become stressed, send molecular signals to each other and quickly employ metabolic survival strategies.
  5. A possible mechanism for the migration of cryoconite holes away from shade implies biocryomorphic regulation of hole floor conditions for populations of holes.
IMGP1914
Making cryoconite hole measurements with co-author Tris Irvine-Fynn (ph. A Edwards)

This paper indicates the potential for combining ice physical, biogeochemical and molecular (in this case metabolomic) analyses in gaining a mechanistic understanding of Earth’s ice as a ‘living landscape’. Another recent paper by Bagshaw et al (Cardiff Cold Climate) examining cryoconite responses to light stress at the other end of the planet is available here.