1. Primary Productivity Nutrient Cycling Honors Biology – Edgar October 2011

9. NPP=GPP-R

14. phytoplankton Who are the Phytoplankton? Coccolithophore Diatoms Dinoflagellates

15. Thermocline Depth in meters 0 100 Nutrients Euphotic Zone or Mixed Layer Thermocline 0µM 5µM 10µM 200 0% 50% 100% Light 0° 10° 20° Temperature

16. Gulf of Maine Data: Wilkinson and Jordan Basins Wilk. Basin Jordan Basin

17. Redfield Nucleic Acids Lipids Proteins Carbohydrates CO 2 Light Nutrients (N, P, etc) The Redfield Ratio 106 Carbon : 16 Nitrogen : 1 Phosphorus Liebig’s Law: Growth of a “plant” is determined by availability of the single most limiting resource.

18. Duck?

26. Nutrient Cycle