Lect_15_Hypolim

Lect_15_Hypolim - Lecture 15: Trouble down below; the...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
Lecture 15: Trouble down below; the hypolimnion strikes back Decomposition processes Methane Nitrogen Redox, iron and phosphorus Internal loading
Background image of page 1

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

View Full DocumentRight Arrow Icon
(Particulate organic matter) Inorganic nutrients
Background image of page 2
Microbial oxidation of organic matter Source material (POM, DOM): Complex proteins, lipids, polysaccharides, other polymers Simpler products, e.g. monosaccharides, amino acids, fatty acids, nucleotides CO 2 , H 2 O Electron-accepting stage CO , N CO 2 , S 2 CO 2 , CH 4 hydrolysis Aerobic respiration Anaerobic fermentation Denitrification (facultative anaerobes) sulfate reduction methane production Strict anaerobes Aerobes and facultative anaerobes NO SO 4 2- C-C, CO 2
Background image of page 3

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

View Full DocumentRight Arrow Icon
Methane production Increasing in atmosphere at about 1% per annum Northern wetlands (including lakes and rivers) and rice paddies are the biggest sources (ruminants significant but much less) Methane production may account for half of all the organic matter consumed under anaerobic conditions (hypolimnion, sediments)
Background image of page 4
H Methane derives from methyl carbon of acetate (CH 3 COOH) Or by reduction of CO 2 , using H derived from organic acids
Background image of page 5

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

View Full DocumentRight Arrow Icon
Methanogens and sulfate reducers duke it out…. Organic intermediates
Background image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 07/10/2010 for the course BIOL 351 taught by Professor Ralphsmith during the Winter '10 term at Waterloo.

Page1 / 15

Lect_15_Hypolim - Lecture 15: Trouble down below; the...

This preview shows document pages 1 - 7. Sign up to view the full document.

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