University:
York University
Course:
SC/BIOL 2021 | Cell Biology
Academic year:

2019
Views:

105

Pages:

2
Author:

Nick T.

Primary Production Processes 1/23/19 Types of Primary Producers Plants Seagrasses, Salt marshes, mangroves Cover less than 1% global marine systems. Ch 2 Hay be responsible for 50% of carbon storage in Marine sediments. Algae are NOT plants Micro+ Macroalgae Algae came First Glucose comes from Photosynthesis. Solar energy => chemical energy. Inorganic carbon is needed for dark reactions several Forms HCO₃, CO₂, Co Dic Dissolved Inorganic Compound Light and Pigments. Light penetrates to about 200m in clear water Varies w/ light wavelengths. PAR Photosynthetic Active Radiation 400-700 cm Dozens of pigments that play roles: Chlorophyll a accessory pigments. is essential, but there ave also Photosynthesis = Respiration rate Compensation depth Primary producers respire too! Aerobic respiration glucose is oxidize using Oz as Productivity Terms. electro Algal respiration. Photosynth. P RA GPP - P NPP= P-RA WCR = Rc NCPP-RC Besides Carbon, Inorganic nutrients are needed. Plants and Algae both require similar inorganic materials. → Nutrients are obtained from water by diffusion. DBL thickness is affected by water flow and surface roughness. Nutrients and Growth A cell needs a nutrient at a particular rate to sustain its needs. Smaller organisms have a larger SA:V ratio, so they're able to acquire the nutrients they need. → Growth can be limited to the nutrient supply rate. Limiting Nutrients Nutrient requirements of an organism reflect its biochemical composition. Global Trends in P.P Redfield ratio: 106:16N:1P Coastal PP is usually good due to high sunlight, and nutrient supply from rivers. Tropics usually have low P.P.