Phytoplankton community structure in a high-nutrient, low-chlorophyll region of the eastern Pacific Subantarctic region during winter-mixed and summer-stratified conditions
- Bouman, HA
- Lepere, C
- Scanlan, DJ
- Ulloa, O
DOIAbstract
Phytoplankton community structure was analysed in the Subantarctic sector of the eastern South Pacific, a high-nutrient, low-chlorophyll (HNLC) region, during a period of deep vertical mixing (austral winter Aug-Oct, 2005) when Antarctic Intermediate Water (AAIW) gets formed, and during a period of water-column stratification characterised by shallow mixed layers (austral summer Feb-Mar, 2006). We examined both the entire phytoplankton assemblage through the use of diagnostic pigments and also the picophytoplankton fraction (<3. μm) through the use of class-specific molecular probes and flow cytometry. Both the pigment and molecular data reveal a dominance of prymnesiophytes during both the winter-mixed and summer-stratified periods. Chryso...
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