trichodesmium cultures grown under different co 2 and temperatures
DESCRIPTION
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 PresentationTRANSCRIPT
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]