replicate  taxon            date_addition  time_local_addition  time_gmt_addition  soluble_P  soluble_N  
A          Trichodesmium    03/15/2011     23:23:00             09:23:00           0.526      0.137      
B          Trichodesmium    03/16/2011     00:25:00             10:25:00           0.613      0.055