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Excess nutrients 2 spring runoff salinity barrier 3

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Unformatted text preview: 20,000 km2) 1. Excess nutrients 2. Spring runoff: salinity barrier 3. Nutrients + warm water ➡ Algal bloom 4. Dead algae to bottom 5. Bottom: O2 depletion Summer 2011: algal bloom in Brittany, France local algal bloom, rots on beach, release H2S dead: 31 boar, 1 horse, 2 dogs, 1 human Photosynthesis: Light H 2O Light ATP reactions NADPH CO2 Calvin Cycle sugar + O2 intake of CO2: stomata Trade-off between CO2 acquisition - H20 preservation: - open stomata to get CO2 ➡ H2O loss - close stomata to preserve H2O ➡ lack of CO2 Consider in relation to photosynthetic pathways: C3, C4, CAM C3 pathway (most plant species) - C-fixation & light-dependent reactions occur in mesophyll, simultaneous (1) RuBisCO: fix CO2 to a 3-C compound (2) reduce to a 6-C compound RuBisCO: (3) regenerate RuBisCO - most common soluble protein in nature - holds up to 50% of a leaf's N content Problem: Photorespiration: with low [CO2] RuBisCO binds to O2, reverses light reaction; increases at higher temps Self-check: How come RuBisCo has such a low relati...
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