Fig. 4: Net primary productivity (NPP) of three species (P. decipiens), (H. grandifolius), (Crustose Coralline Algae) against depth for every tile (1/4 degree) of seafloor that has estimated light at the seabed (EBed) for depths between 0 and 200 m (Gattuso et al., 202046). | Communications Earth & Environment

Fig. 4: Net primary productivity (NPP) of three species (P. decipiens), (H. grandifolius), (Crustose Coralline Algae) against depth for every tile (1/4 degree) of seafloor that has estimated light at the seabed (EBed) for depths between 0 and 200 m (Gattuso et al., 202046).

From: Deep-living and diverse Antarctic seaweeds as potentially important contributors to global carbon fixation

Fig. 4

Light at the seabed for every tile was converted to net primary production (NPP) using literature-derived photosynthetic parameters (P. decipiens, a; H. grandifolius, b; Gomez et al. 199750; CCA, c; Schwarz et al. 200551). The red horizontal line shows the “compensation point” of each seaweed, the point at which photosynthesis and respiration are balanced. Points below this line show net carbon loss, while points above show net carbon gain. The vertical green dashed line shows the mean depth at which the compensation point is crossed, and the solid green lines are one SD from the mean.

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