I can't find any publications on relative abundance of soil microbial communities at species level. I have found papers mostly on phylum and genus level. Then I came across only one study that discussed the bacterial community structures in (a) phylum level, (b) class level, (c) order level, (d) family level and (e) genus level in bioreactor sludge that I am attaching here under to be more clear about my query. I have analyzed my data at all these levels including species level but I cannot find any literature on it. Either I am not doing it right or not searching it right. If you are interested in abundance of a specific specie then how to do it ?