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15 Cards in this Set
- Front
- Back
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What is involved in the microbial loop? |
- Bacteria, pico/nano phytoplankton, microzooplankton - Rapid regenerated nutrient cycling |
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What is involved in the metazoan loop? |
- Nano/micro phytoplankton, mesozooplankton, fish - Uses 'new' nutrients, requires physical processes e.g. upwelling - Interacts with microbial loop |
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What does an NPZ model involve? |
- Nutrients (usually N) - Phytoplankton - Zooplankton |
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What is stoichiometry? |
- Assuming a fixed C:N:P (Redfield) - Used single currency (N) |
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FDM'90 |
- Fasham, Ducklow & McKelvie, 1990 - N-based plankton dynamics in the oceanic mixed water |
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Blackford et al, 2004 |
- A model with many functional groups - European Regional Sea Ecosystem Model (ERSEM) |
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Define 'functional types' |
Grouped according to functional role within the ecosystem, not usually taxonomic |
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Sunlight and photosynthesis in the model |
- Simple average day with clouds - Light attenuation with mixing depth and biomass - PS linked to nutrient status |
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Mixing within the model |
- Linekd to changes in mixing depth over the year, and diffusive mixing rate - This gives rate akin to a chemostat dilution rate |
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Define 'chemostat' |
A bioreactor to which a fresh medium is continually added, whilst culture liquid is continually removed to keep volume constant. |
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Summarise NPZ models |
- Classic models of ocean biogeochemistry - Dashed arrows show links to below the mixed layer - N units - Monod style (Jacques Monod equation, wimilar to Michaelis-Menten equation) |
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What does a Monod model assume? |
- Growth is controlled by available external resources - Fixed stoichiometry (Redfield; C:N:P) |
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What does a quota model assume? |
- Growth is controlled by internal resources - Variable stoichiometry |
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What is stoichiometry? |
A measure of elements; uses relationships between reactants and/or products to determine quantitative data. |
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Do Monod and quota behave in the same way in a steady-state model? |
Yes. |
