Trichodesmium cultures grown under different CO 2 and temperatures
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Hutchins et al . ( 2007). Trichodesmium cultures grown under different CO 2 and temperatures. Meta analysis (Findlay et al. 2011) on E. huxleyi cultures shows that after p CO 2 and TA, P concentration controls PIC:POC response. - PowerPoint PPT Presentation
Transcript of Trichodesmium cultures grown under different CO 2 and temperatures
Trichodesmium cultures grown under different CO2 and temperatures
Hutchins et al. (2007)
Meta analysis (Findlay et al. 2011) on E. huxleyi cultures shows that after pCO2 and TA, P concentration controls PIC:POC response
Study PIC:POC Growth rate DaylengthIglesias-Rodriguez et al. (2008) ↑ ↓ 12hUnpub. data, Bretherton ↔ ↓ 14hHoppe et al. (2011) ↓ ↔ 18hShi et al. (2009) ↓ ↔ 24h
0 200 400 600 800 1000 1200 14000
0.2
0.4
0.6
0.8
1
1.2
1.4
Long daylight periodLinear (Long daylight period)
pCO2 (µatm)
PIC:
POC
14h 24h0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
AmbientHigh CO2
L:D Cycle
µ (d
-1)
14h 24h
-0.4
-0.2
0
0.2
0.4
0.6
0.8
AmbientHigh CO2
L:D Cycle
Cocc
osph
ere
thic
knes
s (µm
)
14h 24h0
0.1
0.2
0.3
0.4
0.5
0.6
Ambient High CO2
L:D Cycle
Fv/F
m
Fv/Fm decreases slightly in
continuous light cultures – stress?
14h daylight period: calcification maintained, but at the cost of growth
rate
24h daylight period:no change in growth rate,
but cultures produce excess coccolithes
Species Strain Date of isolation
Location of isolation
Emiliania huxleyi PML 70-3 02/07/2011 Northern North Sea
Emiliania huxleyi PML 124-3 25/06/2011 Bay of Biscay
Emiliania huxleyi RCC962 29/10/2004 French Polynesia
Gephyrocapsa oceanica RCC1804 09/12/2008 Sipadan, Malaysia
Coccolithus pelagicus PLY 182 1958 English Channel
Ochrosphera sp. RCC1366 22/02/1998 Palau, Micronesia
E. huxleyi G. oceanica0
0.1
0.2
0.3
0.4
0.5
0.614:10h
AmbientHigh CO2
Species
µ (d
-1)
E. huxleyi G. oceanica0
0.1
0.2
0.3
0.4
0.5
0.6
0.724:0h
AmbientHigh CO2
Species
µ (d
-1)
E. huxleyi G. oceanica0
0.1
0.2
0.3
0.4
0.514:10h
AmbientHigh CO2
Species
Cocc
osph
ere
thic
knes
s (µm
)
E. huxleyi G. oceanica
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
0.424:0h
AmbientHigh CO2
Species
Cocc
osph
ere
thic
knes
s (µm
)
E. huxleyi G. oceanica0
0.1
0.2
0.3
0.4
0.5
0.6
14:10h
AmbientHigh CO2
Species
Fv/F
m
E. huxleyi G. oceanica0
0.1
0.2
0.3
0.4
0.5
0.6
24:0h
Ambient High CO2
Species
Fv/F
m
Species/Strain 14h 24h
E. huxleyi NZEH Calcification ↔µ ↓
µ ↔, produces lose lithes
E. huxleyi 962Thin coccosphere calcification ↔µ ↓
µ ↔, produces lose lithes
G. oceanica Calcification ↓µ ↓
µ ↓, produces lose lithes
Shipboard experiments from the Arctic Circle and Southern Ocean
Meta-analysis of all OA literature to see whether or not L:D controls the observed response
L:D cycle is an important consideration for OA experiments
Discrepencies in OA response can be explained by L:D cycle
Local changes in L:D cyclesin nature as climate changes
Acknowledgements
Supervisors Dave Suggett and Tracy Lawson
Richard Geider the Algal Research Group at University of Essex
Mark Moore and Alex Poulton
I am in the third year of my PhD and looking for more research [email protected]
