Fig. 1: Physiological state and NPP are a function of environmental conditions and age. | Communications Biology

Fig. 1: Physiological state and NPP are a function of environmental conditions and age.

From: Senescence-driven solubilization of biomass is the main source of kelp-derived dissolved organic carbon to the coastal ocean

Fig. 1

a Age-related changes in the tissue chlorophyll a to carbon ratio in the spring (circles) and summer (triangles). Shading on either side of 50 days represents the transition between mature (<50 days) and senescent (>50 days) giant kelp. Solid lines are a sigmoidal fit to emphasize the non-linear decline in Chl:C with age. Curves were manually fit assuming a maximum age of 100 days and a minimum Chl:C equal to the average Chl:C for the summer cohort at 78 days of age. Error bars are ±1 SD from the mean for the six replicate blades sampled for each age. b Rate of net primary production (NPP) by giant kelp blades in response to gradients in age and light intensity (photosynthetic photon flux density of PAR). Trends for the spring (circles) and summer (triangles) are shown. The dashed, horizontal line represents the transition between net respiration and net photosynthesis.

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