The second chapter of my PhD dissertation has just been published at Proceedings of the Royal Society B, titled “Do priority effects outweigh environmental filtering in a guild of dominant freshwater macroinvertebrates?” The first big effort of this paper was the field campaign, in which I visited over 125 field sites distributed throughout ten headwater stream catchments, each four times over the course of a year. That’s high spatio-temporal resolution, and I have to say thank you to all of our technicians for helping me out! A second big effort was to implement a hierarchical joint species distribution model that could take advantage of our sampling scheme. I was able to show that amphipod species coexisted less frequently than we had expected, and that  distribution patterns were stable over time – suggesting that priority effects may be occurring at the catchment level and leading to different community structures even in environmentally-similar stream reaches.