I determined the abundance values of each specie in each site, now I wanna find the dominant specie names in that huge data set, any easy method to calculate those dominant specie names?
The information you provided isn't enough to comment on the matter. You can probably explore some methods for feature selection, feature importance calculation, or sample clustering.
If your data is in table format(rows and columns) then you can use languages like Python to address your issue. You can import your dataset in a dataframe and use below package.