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A P P L I E D S C I E N C E S
RMPRMPTransplanted Bivalve ProgramTransplanted Bivalve Program
Recommendations for Consideration:Recommendations for Consideration:
1.1. Eliminate Maintenance CruiseEliminate Maintenance Cruise
2.2. Reinstitute Wet-season Deployments at YBIReinstitute Wet-season Deployments at YBI
TRC Meeting 20 September 2005TRC Meeting 20 September 2005
A P P L I E D S C I E N C E S
Eliminate Maintenance CruiseEliminate Maintenance Cruise
Objectives of Maintenance CruisesObjectives of Maintenance Cruises– Reduce mooring losses from equipment Reduce mooring losses from equipment
failurefailure– Reduce potential negative effects of fouling Reduce potential negative effects of fouling
on bivalve health on bivalve health
A P P L I E D S C I E N C E S
PilingLife Ring
Divers
Buoy
Mesh Bag
Bivalves
Ground Line
Earth Anchors
A P P L I E D S C I E N C E S
Maintenance Cruise has never Maintenance Cruise has never prevented the mid-deployment prevented the mid-deployment
loss of a mooring due to loss of a mooring due to equipment failureequipment failure
A P P L I E D S C I E N C E S
A P P L I E D S C I E N C E S
Maintenance Effects on SurvivalMaintenance Effects on Survival
0%
20%
40%
60%
80%
100%
120%
BA
10 -
Coy
ote
Cre
ek
BA
30 -
Dum
bart
onB
ridge
BA
40 -
Red
woo
dC
reek
BB
71 -
Ala
med
a
BC
10 -
Yer
baB
uena
Isla
nd
BC
21 -
Hor
sesh
oeB
ay
BC
61 -
Red
Roc
k
BD
30 -
Pin
ole
Poi
nt
BD
20 -
San
Pab
loB
ay
BD
40 -
Dav
is P
oint
Site
Per
cen
t S
urv
ival
2002 Maint.2002 Unmaint.2003 Maint.2003 Unmaint.2004 Maint.2004 Unmaint.
A P P L I E D S C I E N C E S
Maintenance Effects on GrowthMaintenance Effects on Growth
-1
-0.5
0
0.5
1
1.5
BA
10 -
Coy
ote
Cre
ek
BA
30 -
Dum
bart
onB
ridge
BA
40
- R
edw
ood
Cre
ek
BB
71 -
Ala
med
a
BC
10 -
Yer
baB
uena
Isla
nd
BC
21 -
Ho
rses
hoe
Bay
BC
61 -
Red
Ro
ck
BD
30 -
Pin
ole
Poi
nt
BD
20 -
San
Pa
blo
Bay
BD
40
- D
avis
Poi
nt
Site
Mea
n G
row
th,
g
2002 Maint.2002 Unmaint.2003 Maint.2003 Unmaint.2004 Maint.2004 Unmaint.
A P P L I E D S C I E N C E S
No differences in survival or No differences in survival or growth between maintained and growth between maintained and
unmaintained cagesunmaintained cages
A P P L I E D S C I E N C E S
Reinstitute Wet-season Reinstitute Wet-season Deployment at YBIDeployment at YBI
Based on analysis of trends in legacy Based on analysis of trends in legacy pesticides at YBI for Connor, pesticides at YBI for Connor, et alet al. synthesis . synthesis articlearticle– Relationships among legacy pesticides and time, Relationships among legacy pesticides and time,
rainfall and delta outflow (95th percentile and rainfall and delta outflow (95th percentile and mean)mean)
A P P L I E D S C I E N C E S
0
2,000
4,000
6,000
8,000
10,000
12,000
14,000
01/01/80 01/01/84 01/01/88 01/01/92 01/01/96 01/01/00 01/01/04
Date
Sum of DDTs, ng/g lipid
Sum of Chlordanes, ng/g lipid
Dieldrin, ng/g lipid
Mean Daily Delta Outlfow 100 Previous Days, cfs/10
A P P L I E D S C I E N C E S
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
01/01/80 01/01/84 01/01/88 01/01/92 01/01/96 01/01/00 01/01/04
Time
Rat
io
DDTs:Delta OutflowChlordanes:Delta OutflowDieldrin:Delta Outflow
A P P L I E D S C I E N C E S
Wet-season deployments at YBI Wet-season deployments at YBI would help track historic trends would help track historic trends in PCBs and legacy pesticides in PCBs and legacy pesticides and the effects of delta outflow and the effects of delta outflow
and management actions on and management actions on trendstrends
A P P L I E D S C I E N C E S
0
50
100
150
200
250
300
0 5 10 15 20
Years
Pe
rce
nt
De
tec
tab
le D
iffe
ren
ce
1 site per segment2 sites per segment3 sites per segment
Sum of PCBs
A P P L I E D S C I E N C E S
0
50
100
150
200
250
0 5 10 15 20
Years
Pe
rce
nt
De
tec
tab
le D
iffe
ren
ce
1 site per segment2 sites per segment3 sites per segment
Dieldrin
