My previous blog post I ended with the main activity of microbes in marine sediments: the breakdown of organic matter deposited from the water column. The sedimentation rate at which organic matter is deposited at the sea bed is dependent on the particle size and on the water velocity above the sea bed. In the previous blog you could read that pockmarks affect the water movements above the seabed, which affects the sedimentation and re-suspension rates of particles. A difference between normal sediments and pockmark sediments in the sedimentation rate of organic matter could have an affect on microbial communities in these sediments.
In our publication on bacterial communities of the Olsofjord pockmarks we found that they are different from the surrounding seabed. But before I explain more about this result, I would like to explain how we did our experiment. Continue reading