Figure 3
From: Testing algal-based pCO2 proxies at a modern CO2 seep (Vulcano, Italy)
The δ13C of general phytoplankton biomarkers in surface sediments from Levante Bay, Italy. Loliolide (red triangle), cholesterol (blue square), and phytol (green circle) from CO2 seep (S) to control site (Site 16) sediment collected in May (light colors) and October (darker colors). Diamonds mark sites where there was minor additional bubbling of gas observed.
