Primary productivity Word Scramble
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| Question | Answer |
| Standing crop | Amount of plant material alive at any one time Can be applied to phytoplankton, algae, or all plants |
| Primary production | Same as photosynthesis Biological process of creating high energy organic material from CO2 H2O and other nutrients using solar energy 6H2O + 6CO2 yields C6H12O6+ 6O2 |
| Gross primary production | Total amount of organic material produced in the sea by photosynthesis |
| Net primary production | Any excess production used for growth, reproduction, and losses due to death |
| Harvest method ( measuring primary production) | MEASURES BIOMASS AND EXPRESS AS BIOMASS PER UNIT AREA PER UNIT TIME CAN BE DESTRUCTIVE |
| Light and dark bottles ( measuring primary production) | Measure O2 in each, dark represented O2 lost to respiration, light was total gained Add them together to get GPP Older method |
| Nielsen method ( C14) measuring primary production | Measures amount of radioactive C14 assimilated by PPK In their tissues Is a measure of NPP Newer method |
| Chlorophyll A method ( measuring Primary production) | Measure amount of chlorophyll present in a certain area using satellites Assumes a direct relationship between amount of chlorophyll and rate of photosynthesis This is called remote sensing |
| Limiting factor | Any condition that exceeds limits of tolerance or doesnât satisfy basic material needs of an organisms and establishes a check on further population growth |
| Light ( factor affecting pp) | Must remain in photic zone Zone depth changes due to atmosphere, angle of sun, and water transparency |
| Photo-inhibition | Reduction of photosynthesis rates due to too much light Organisms adjusts to light intensity |
| Nutrient requirements ( factor) | Calcium for calcium shells Silicon for silica shells CHNOPS Trace elements- elements needed in minute amounts IRON, Maganese, cobalt, zinc, copper |
| Nutrients continue | Many nutrients lie below photic zone. Mixing occurs due to seasonal temperature changes ( CONVECTIVE MIXING) Langmuir cells- parallel Pairs of small counter rotating convection cells driven by surface winds |
| Grazing ( factor) | Phytoplankton eaten by zooplankton which excrete or die and are then recycled into usable substances by Bacteria |
| Temperature ( factor) | Pp has an optimal temperature range |
| Carbon dioxide factor | CO2 concentration Not usually a problem in the ocean but plenty available |
| Seasonal patterns | All PP measurements change in response to seasonal differences in light intensity |
Created by:
Iamnotmaddy