Term
Measuring Primary Productivity
(4) |
|
Definition
Light/dark bottle method
Dark bottle= respiration
Light bottle= net photosynthesis (NPP)
Light bottle-dark bottle= gross photosynthesis (GPP) |
|
|
Term
|
Definition
Light availability: Photic zone
Nutrients and sinking: also role of thermocline |
|
|
Term
|
Definition
Nitrogen: ammonia, nitrite, and nitrate
Phosphorous and silica are more typical biogeochemical cycles |
|
|
Term
|
Definition
Unique cycle, w/ critical biological contributors
Needed by producers and other for: proteins, nucleic acids |
|
|
Term
|
Definition
| Weathering, uptake sedimentation |
|
|
Term
Biogeochemical Cycling
(3) |
|
Definition
Bio: autotrophs, consumers, decomposers
Chemical: Dissolved nutrients mixing in water
Geo: Uplift and erosion in sediments |
|
|
Term
|
Definition
Required by phytoplankton and others for: phospholipids, ATP, and nucleic acids
Very low in seawater: not typically limiting to growth, nitrogen usually limiting
Cycle sources: weathering, rivers
Can be used directly in dissolved form
"Lost' via sedimentation
Silica is similar: essential for diatoms |
|
|
Term
|
Definition
N2 fixation: gas into usable form NH4, Via bacteria and archaea
Nitrification: conversion to nitrite and nitrate, also via bacteria
Absorption and assimilation: into plant and animal tissues
Decomposition: bacteria
Dentrification: back to N2 |
|
|
Term
|
Definition
O2 and CO2 exchange in marine systems
Not just physical exchanges, see roles for organisms |
|
|
Term
Strong Thermocline and Productivity
(4) |
|
Definition
Temperate zone in summer
Thermocline limits mixing, nutrients lost via sinking
Low productivity
Tropics year round |
|
|
Term
No Thermocline and Productivity
(6) |
|
Definition
Temperate zone in winter
Nutrients well mixed
Low productivity
Low light levels
For polar regions year round also light limited= low productivity
Except summer= high productivity |
|
|
Term
| Weak Thermocline and Productivity |
|
Definition
Temperate zone spring/fall
Some mixing
Moderate/hi light= high productivity |
|
|
