PowerPointPrsentation

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Part I
Effect of solar radiation on dissolved organic
carbon A photobleaching or photocoloring process?
Bettina Reitner Institut of Ecology and
Conservation Biology Univ. Vienna Dept. Of
Marine Biology
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solar
radiation
air water
interface
DOM
s
Photo-
i
M
s
O
sensitizer
P
D
y
h
o
l
o
t
D
O
M
D
O
M
?
red. oxygen
bio-
bio-
species
refractory
available
inorg. C
?
unidentified
BACTERIA
bleached
organic
matter
Ingrid (2000)
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Part of the Shikimat Pathway
3D - Tryptophan
Richter (1996)
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0.2µm filtered lake water amended with Tryptophan
Photocoloring Solar-radiation mediated Humificat
ion
Dark control
Carbon loss of 13.3 µM DOC h-1
9h exposed to solar radiation
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Reitner et al. (2002) AME
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Reitner et al. (2002) AME
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Phragmites australis production for the entire
lake 0.7-4.5 g C m-2d-1
KvetWestlake (1998) in P.australis Ala 3 mg
g-1reed DW Phe 2.5 mg g-1reed DW Tyr 1.6 mg
g-1reed DW
Calculation for Lake Neusiedl 9-48 mg Ala
m-2d-1 8-40 mg Phe m-2d-1 5-26 mg Tyr m-2d-1
If only 0.1 of the daily Ala production reaches
the water through leaching processes input 5-27
nM d-1 measured Ala Trp 10nM
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Milli-Q water amended with 4mg CTrp plus
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21 carbon loss after 48h DKUV mean 15 n6
4 carbon loss after 48h DKUV
But 22 carbon loss !!! 0-48h in the dark
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Trp17 carbon loss
Ratio250/365 21.31
Ratio250/365 15.11
0h RhamBS
0h RhamBS
RhamBS 7 carbon loss
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Part II
Sodapools within the National Park
Neusiedlersee-Seewinkel Ecosystem with high
ultraviolet radiation impact (2000h/year)
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Distribution of alkaline, saline Lakes

• North-America, (B) East- Africa, (C) China, (D)
  East-Europe, (E) Russia,
• (F) Australia, (G) West-Canada, (H) Chile, (I)
  Venezuela, (J) Turkey/Iran,
• (K) India, (L) North-Africa, (M) Mexico (nach
  Tindall 1988, Grant 1992)

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National Park Neusiedlersee - Seewinkel

• Number of Ponds
• 139 (1850) 79 (1957) 63 (1986) 34 (2000)
• Specific Features
• Shallow
• Some have a high turbitity
• Sealing at the bottom
• through a fine sediment layer (loess)
• Ponds are controlled by ground water,
• precipitation and evaporation,
• Changing salinity because of evaporation
• Different DOM inputs (Macrophytes)

site East Austria area approx. 450 km2
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Albersee in springtime
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Albersee in summertime
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Chenopodiaceae Sueada maritima
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Chemo-Physical Characterisation
OS US ZL LL WL area km2 0.49 0.19 0.
70 2.24 0.29 Ptot mg L-1 3.3
(0.9-11.7) 1.2 (0.2-3.9) 0.5 (0.2-2.4) 1.2
(0.3-4.9) 1.3 (0.2-4.9) Chl.a µg L-1 64
(4-133) 66 (0-402) 7 (0-48) 199 (21-1720) 72
(0-338) salinity g L-1 7.4 (4.2-41) 4.4 (2.8
- 17) 5.4 (2.7 - 18) 3.8 (2.4-11.2) 5.4(2.4-18.5)
pH 9.8 (9.4-10.2) 9.5 (9.0-10.2) 9.8
(9.4-10.9) 9.5(9.1-9.9) 9.2 (8.9-9.8) turbidity
g L-1 1.8 (0.3-7.0) 0.8 (0.02-3.8) 0.08
(0.02-0.5) 0.3 (0.08-2.1) 0.3 ( 0.04-2.4)
sediment type fine Sand fine Sand Clay
Silt Silt
(n 23 ), A. Kirschner
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Salinity Ratios
Anione


Katione
Ca
Mg
K
Na
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Microbial Parameter
OS US ZL LL WL Bacteria 109 L-1 82
(11-495) 56 (4-232) 10 (1 -66) 57 (7-195) 24
(2-172) Cyanobact. 109 L-1 107 (1-1050) 37
(0-208) 3.5 (0-36) 68 (0.8-436) 11 (0-72) BSP
µgC L-1 h-1 146 (2 -925) 124 (3-434) 126
(5-589) 143 (3-626) 120 (1-689) µ, h-1 0.09
( 0.60) 0.09 ( 0.55) 0.32 ( 1.14) 0.19 (
1.65) 0.13 ( 0.38) g h 33 (1.1-182) 15
(1.3-67) 5.5 (0.6 - 24) 16 (0.4-125) 11 (1.9-42)
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Comparison with natural aquatic Ecosystems
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Diel Cycle
Waterdepth (cm)
Temperature (C)
Oxygen (mg O2 L-1)
Conductivity ( mS cm-1)
16 18 20 22 24 2 4 6 8
10 12 14
16 18 20 22 24 2 4 6 8
10 12 14
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Diel Cycle
OS
BSP (µgCL-1 h-1)
109 cells L-1
LL
109 cells L-1
µ ( h-1)
16 18 20 22 24 2 4 6 8
10 12 14
16 18 20 22 24 2 4 6 8
10 12 14
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