Hydrographic profiles and water samples were collected with a standard CTD-rosette system with Niskin bottles. Nutrient samples were filtered through Millipore HA filters, placed immediately in a sea water-ice bath for 5–10 min, and frozen at −18°C. Concentrations of NO3+NO2, NH4, Si(OH)4 and PO4 were measured with a Bran Luebbe AA3 AutoAnalyzer using standard techniques.
A. fundyense cells were enumerated from water samples using an oligonucleotide probe and methods described in Anderson et al. (2005). Both A. tamarense and A. fundyense occur in the Gulf of Maine, and these are considered to be varieties of the same species. Available molecular probes cannot distinguish between them, and only detailed analysis of the thecal plates on individual cells can provide this resolution—which is not practical for large numbers of field samples. Accordingly, for the purpose of this study, the name A. fundyense is used to refer to both forms.
Anderson, D. M., D. M. Kulis, B. A. Keafer, K. E. Gribble, R. Marin, and C. A. Scholin. 2005. Identification and enumeration of Alexandrium spp. from the Gulf of Maine using molecular probes. Deep-Sea Research II 52: 2467-2490.
BCO-DMO Processing/Edits
- Generated from data in original file "GOM_GB_nuts_TS_Alex_v2.tar.gz" contributed by Olga Kosnyrev
- Awk routine "GoMEbottle2csv.awk" generated to convert bottle ".txt" files to BCO-DMO .csv files
- Updated with version 3 data for 2008/EN448 data 21March2013, srg
- All bottle data reprocessed to correct NH4 data 21March2013, srg