Excited to announce that we have a new paper out in @ISMEJournal w/ @JenniHultman @Teppo_Hiltunen J Cairns and L Ruusulehto. Please check it out!.

RT @rogier_braakman: Excited to finally share this work! This paper is years in the making. We uncover a global network of purine and py….

These results illustrate that localized coevolutionary processes between species pairs can reverberate through ecosystem-scale transcriptional networks with potential consequences for broader ecosystem function.

Altering the coevolutionary history of the prey had little effect on the ecology of the system but induced large functional changes in community transcription and metabolic potential.

We conducted experiments with a synthetic 30-species bacterial community and experimentally manipulated the coevolutionary history of a ciliate predator and a single bacterial prey species.

Closely interacting microbial species pairs (e.g., predator and prey) can become coadapted via reciprocal natural selection. A challenge in evolutionary ecology is to untangle how coevolution in small species groups affects and is affected by biotic interactions in communities.

neat paper.

Hello, a new preprint from me, @JenniHultman, @Teppo_Hiltunen, and others:. The evolutionary history of one coevolving species pair influences community transcription and ecological function. We appreciate any and all feedback!.

RT @NdelaFaye: Everyday racism in Finland’s (world-class?) early childhood education, a thread:.

This was a nice collaboration with @ackero9 who spearheaded the very challenging chemical analyses! . Thanks very much to all co-authors! (@th4ckl, @pmberube, @rstepanauskas).

Please have a look at our new paper on phosphonate production in the surface ocean!.

RT @siderophores: Siderophores as an iron source for picocyanobacteria in deep chlorophyll maximum layers of the oligotrophic ocean. https:….

As always, a big thank you to my wonderful coauthors (flagging those I know to be on twitter!) @rmbundy, @th4ckl, @pmberube, @Teppo_Hiltunen.

From what I can tell, the S. Atlantic gyre perhaps hasn't received as much oceanographic attention as other regions. There could be a great opportunity to partner with colleagues in Africa and S. America to look into phytoplankton community Fe deficiency there!.

It seems like the S. Atlantic gyre could be a region of general ecosystem iron deficiency. Interestingly, it seems like most biogeochemical models predict community N limitation here, but our findings would suggest something more complex is happening.

Re 2) The Martiny group was the first to report that there seemed to be abundant Prochlorococcus siderophore consumers in the S Atlantic gyre. Our results agree, and we arguably found more than they did because we looked in deeper samples.

Re 1) There is evidence that NO2 in the euphotic zone comes from light/Fe limited phytoplankton that cannot completely assimilate NO3 because NO2 reductase is a huge Fe sink. This seems to mesh with finding Pro siderophore consumers deep in the water column in low Fe regions.

There were two additional surprising findings: 1) Pro siderophore consumers were very abundant in euphotic zone samples with high NO2 concentrations and 2) they were also quite abundant in the S Atlantic oligotrophic gyre.

Within these remote, low-dust-flux, open ocean regions siderophore consumers were most abundant at the DCM (with the exception of a few regions where we happened to sample a lot of HNLC Prochlorococcus - then the depth relationship became less clear).

We then used machine learning methods with thousands of trace metal measurements from @geotraces to show that atmospheric dust deposition patterns set a hard biogeographical boundary for where the relative fitness benefit of siderophore use exceeds that for reduced genome size