Unit 4: Aquaculture - Factors Affecting Marine Productivity
- Created by: rosieevie
- Created on: 22-05-15 14:25
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- Factors Affecting Marine Productivity
- Light - photosynthesi
- Cannot penetrate deep water so seabed autotrophs only in shallow water
- Deeper autotrophs are free-floating phytoplankton that move with currents
- Storms disturb sediments - turbidity reduces depth which light can be absorbed
- Titled axis causes polar regions to have sun never setting in the summer and never rising in the winter = seasonal variations in productivity
- Summer algal blooms support rich food webs
- Net Primary Productivity - energy captured by an autotroph during photosynthesis which has not been used in respiration
- The sea has a low NNP
- Nutrients
- Autotrophs absorb nutrients directly from water - no soil
- CO2 is abundant while NO3/PO4 is not
- Organisms fall to seabed after dead = reducing nutrient availability and productivity
- Continual supply of nutrients e.g. coast (rivers) = high productivity
- Deep oceans = low productivity unless upwellings
- Upwellings caused by surface winds or seabed topography changes
- Ant/Arctic oceans - producers grow quickly with light, nutrients always available
- Light - photosynthesi
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