FunctionalDiversity1

FunctionalDiversity1 - Autotrophs make food from inorganic...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Primary production is a function of not just light and carbon dioxide but also nutrients and trace minerals 106 CO 2 + 90 H 2 O +16 NO 3 + PO 4 + trace minerals = biomass + 150 O 2 Autotrophs: make food from inorganic materials Photoautotrophs: use light as the energy source Photosynthesis: 6CO 2 + 6H 2 O C 6 H 12 O 6 + 6O 2 light nutrients 6CO 2 + 6H 2 O C 6 H 12 O 6 + 6O 2 Respiration: It is this light that autotrophs can use for photosynthesis A relatively narrow range of light wavelengths actually arrives at the Earth’s surface Chlorophyll a - primary light harvesting pigment of green plants How is the energy in light harvested? Why are green plants “green”? Remote sensing of biomass using chl-a http://oceancolor.gsfc.nasa.gov/SeaWiFS/
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Chlorophyll a: All plants (absorbs at 350-430, 600-700nm) Chlorophyll b: land plants + green algae, (420-470, 580-630) Chlorophyll c: dinoflagellates, diatoms, brown algae (400-440, 590-610 - minor) Xanthophyll (fucoxanthin): diatoms, brown algae (400-500nm) Phycocyanin: cyanobacteria 500-650 Phycoerythrin: red algae 450-550 There are other light-harvesting pigments besides Chl-a: How is photosynthesis (Ps) measured? 1. oxygen evolution dark light Change in O 2 in light = Net Community Photosynthesis = Gross (total) Photosynthesis - respiration by algae - respiration by bacteria - respiration by animals Change in O 2 in dark = - respiration by algae - respiration by bacteria - respiration by animals (Change in light) - (Change in dark) = Gross photosynthesis (Ps + Resp) - (Resp.) = Gross photosynthesis 6CO 2 + 6H 2 O C 6 H 12 O 6 + 6O 2 2. Measure drawdown of CO 2 6CO 2 + 6H 2 O C 6 H 12 O 6 + 6O 2 CO 2 (g) + H 2 O H 2 CO 3 H + + HCO 3 - H + + CO 3 2- Measure uptake of radiolabelled carbon (H 14 CO 3 ) a. in air this is straightforward and can be measured directly by changes in CO 2 concentration b. in water, carbonate buffer system causes problems Removal of CO2 increases pH
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/20/2008 for the course BIS 2A taught by Professor Grossberg during the Spring '08 term at UC Davis.

Page1 / 8

FunctionalDiversity1 - Autotrophs make food from inorganic...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online