terrestrial carbon in aquatic ecosystems: experimental tests of the subsidy-stability hypothesis...
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Terrestrial carbon in aquatic ecosystems: experimental tests of the
subsidy-stability hypothesis
Stuart E. Jones & Jay T. Lennon
Producer-DecomposersPhytoplankton-Bacterioplankton
Organic Carbon
Organic Nutrients
Inorganic Carbon
Inorganic Nutrients
Producer Decomposer
Subsidy
Terrestrial DOC is an increasing subsidy to aquatic ecosystems
Findlay 2005 Frontiers in Ecology and the Environment
Hudson River, Northeast USA
Water color ~ DOC
Allo
chth
ony
Carpenter et al. 2005; Jansson et al. 2007
Does terrestrial DOC influence aquatic metabolic stability?
Carbon Loading
Result of Manipulation
Water Color (m-1)
DOC (mg L-1)
0
5
10
15
20
25
30
0 50 100 150 200 250
C Loading (g C m -
DO
C a
nd
Wat
er C
olo
r
DOC isn’t just a subsidy…
0
10
20
30
40
50
60
70
7/7 7/27 8/16 9/5 9/25
Date
SR
P (
mic
rog
ram
s L
-1) High DOC
Low DOC
Next steps…
• Metabolism data• Microbial loop
coupling• ???
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