Table T4. Summary of environmental indicator diatom species used at Sites 1098 and 1099.
Species | Description |
---|---|
Fragilariopsis kerguelensis and Thalassiothrix spp. |
Open ocean; characteristic of Southern Ocean ooze belt |
Thalassiosira antarctica |
Associated with open-water primary productivity |
Eucampia antarctica |
Glacial conditions found in core tops near ice shelves in the Weddell Sea |
Fragilariopsis curta |
Sea-ice-dominated species in the ice-edge bloom |
Chaetoceros spp. spores |
This stressed spore form occurs during extreme stratification of the water column (nutrient-depleting phytoplankton blooms, followed by nitrogen deficiency) |