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Role of Info chemical-Mediated Feeding in Multitrophic Plankton Interactions - PowerPoint PPT Presentation
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Role of Infochemical-Mediated Feeding in Multitrophic Plankton
InteractionsNicola Lewis
Supervisors: Edd Codling and Michael Steinke G. Gorick
H3C CH3
S
rc
rp
Breckels et al. (2011) J Plankton Res 33: 629-639
How do zooplankton find prey?
CH3
H3CS+ COO- COO-H2C
H
C H+
DMSP DMS Acrylate
DMSP lyase
H3C
H3CS
+Steinke et al. (2002) J Phycol 38: 630-638
Tritrophic Model – Methods
Pk
gPM
K
PrP
dt
dP
1
Pk
gPMmM
Pk
gPM
dt
dM
2
Phytoplankton growth
Microzooplankton grazing
Microzooplankton mortality(absence of DMS)
Microzooplankton mortality(presence of DMS)
Lewis et al. (2011) Biogeochem, DOI: 10.1007/s10533-011-9649-0.
r
K
k
g
Tritrophic Model – Methods
Z
Production rate of DMS
Copepod predation rate
Density/ abundance of copepods
Increase in copepod predation (through chemodetection)
Rate DMS leaves the system
Lewis et al. (2011) Biogeochem, DOI: 10.1007/s10533-011-9649-0.
Tritrophic Model – Results M
icro
zoo
pla
nkt
on
Phytoplankton Time
dP/dt=0
dM /dt=0
Ph
yto
pla
nkt
on
/ Mic
rozo
op
lan
kto
n
Phase Portrait Temporal Graph
1. No DMS effect
Lewis et al. (2011) Biogeochem, DOI: 10.1007/s10533-011-9649-0.
×
×
Tritrophic Model – Results M
icro
zoo
pla
nkt
on
Phytoplankton Time
dP/dt=0
dM /dt=0
Ph
yto
pla
nkt
on
/ Mic
rozo
op
lan
kto
n
Phase Portrait Temporal Graph
1. No DMS effect
Lewis et al. (2011) Biogeochem, DOI: 10.1007/s10533-011-9649-0.
×
×
Tritrophic Model – Results M
icro
zoo
pla
nkt
on
Phytoplankton Time
dP/dt=0
dM /dt=0
Ph
yto
pla
nkt
on
/ Mic
rozo
op
lan
kto
n
Phase Portrait Temporal Graph
1. No DMS effect
Lewis et al. (2011) Biogeochem, DOI: 10.1007/s10533-011-9649-0.
×
×
Tritrophic Model – Results M
icro
zoo
pla
nkt
on
Phytoplankton Time
dP/dt=0
dM /dt=0
Ph
yto
pla
nkt
on
/ Mic
rozo
op
lan
kto
n
Phase Portrait Temporal Graph
1. No DMS effect
Lewis et al. (2011) Biogeochem, DOI: 10.1007/s10533-011-9649-0.
×
×
Tritrophic Model – Results M
icro
zoo
pla
nkt
on
Phytoplankton Time
dP/dt=0
dM /dt=0
Ph
yto
pla
nkt
on
/ Mic
rozo
op
lan
kto
n
Phase Portrait Temporal Graph
1. No DMS effect
Lewis et al. (2011) Biogeochem, DOI: 10.1007/s10533-011-9649-0.
×
×
Tritrophic Model – Results
Phase Portrait Temporal Graph
× ×
Mic
rozo
op
lan
kto
n
Phytoplankton
Ph
yto
pla
nk
ton
/ M
icro
zoo
pla
nk
ton
Time
2. Low DMS effect
Lewis et al. (2011) Biogeochem, DOI: 10.1007/s10533-011-9649-0.
Tritrophic Model – Results
Phase Portrait
Mic
rozo
op
lan
kto
n
Phytoplankton
× ×
×
Separatrix
Ph
yto
pla
nk
ton
/ M
icro
zoo
pla
nk
ton Temporal graphs
3. Mid DMS effect
Lewis et al. (2011) Biogeochem, DOI: 10.1007/s10533-011-9649-0.
Tritrophic Model – Results
Phase Portrait Temporal Graph
× ×
Mic
rozo
op
lan
kto
n
Phytoplankton Time
Ph
yto
pla
nk
ton
/ M
icro
zoo
pla
nk
ton
4. High DMS effect
Lewis et al. (2011) Biogeochem, DOI: 10.1007/s10533-011-9649-0.
Competition?
DMSP as a deterrent!
Competition?
DMSP as an attractor!
Competition?
Competition?
No DMS production!
Conclusions
• Infochemicals such as DMS are important for zooplankton in the search for suitable prey.
• Grazing-induced DMS may affect the susceptibility of microzooplankton to predation by copepods.
• Infochemical mediated feeding in the plankton may create a refuge from grazing for phytoplankton through the promotion of multitrophic interactions
Acknowledgments
UoEEdd Codling
Michael SteinkeMark Breckels
OthersAndrew Morozov
Jon PitchfordSteve Archer
