Living Resource Considerations for Instantaneous Minimum ...Living Resource Considerations for...
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Living Resource Considerations for Instantaneous Minimum Dissolved Oxygen
Criteria for Chesapeake Bay
Denise Breitburg Smithsonian Environmental Research Center
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Goals of Instantaneous Minimum Criteria • acute mortality • avoid averaging away real problems
You don’t recover from death
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(Please humor me) – hold your breath
You don’t recover from death
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Short term exposure: (1) Wind/circulation-driven intrusions of deep water into shallow water habitat
Breitburg 1992
2 & 4 m dissolved oxygen near Calvert Cliffs
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Nu
mb
er o
f in
div
idu
als
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dis
so
lve
d o
xyg
en
(m
g/L
)0
2
4
6
8
10
12
Short term exposure: (2) Diel-cycling hypoxia
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Diel-cycling hypoxia
Fish kills
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(B)
Dis
solv
ed o
xygen c
oncentr
ation (
mg/L
)
0.0
3.0
6.0
9.0
12.0 Choptank R. at Mulberry Pt.
0.0
3.0
6.0
9.0
12.0 St. Mary's R. 2008
Days since June 1
0 20 40 60 80 100 120
0.0
3.0
6.0
9.0
12.0St. Mary's R. 2009
All 3 sites meet criteria based on averages
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Diel-cycling hypoxia – repeated short term exposure can also lead to effects associated with chronic exposure to mild hypoxia
Perkinsus marinus (dermo) infections in oysters
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0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0
8/15/2010 8/16/2010 8/17/2010 8/18/2010 8/19/2010 8/20/2010 8/21/2010
Dis
solv
ed
oxy
gen
(m
g/L
)
2010 diel-cycling DO achieved during experiment (example week)
high DO 1.5 mg/L min DO 0.5 mg/L min DO
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2009
Infe
ction p
revale
nce (
mean +
SE
)
0.0
0.1
0.2
0.3
0.4
0.5
0.5 mg L-1
1.5 mg L-1
high oxygen control
2010
0.0
0.2
0.4
0.6
0.8
1 yr old 1 yr old
Diel-cycling hypoxia increases acquisition of P. marinus infections in experimental oysters
Jun 25
Oct 13
0.0
0.2
0.4
0.6
0.8
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Field experiment (2008-09)
} 2008
2009
Patu
xent
julian day
160 180 200 220 240 260 280 300
Daily
min
imum
[D
O] (m
g l
-1)
0.0
2.0
4.0
6.0
8.0
10.0
HCR
HPL
LMN
MUL
SERC
Jun Jul Aug OctSep
3 mg/l
2 mg/l
1 mg/l
Darryl Hodorp (USGS) , in prep
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Prevalence Intensity
1 yr olds: P= 0.009 P= 0.02
R2 = 0.53 R2 = 0.44
2-3 yr olds: ns P= 0.014
R2 = 0.51
Increased disease
Prevalence & intensity
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Decreased growth
Frequency of days with minimum [DO] <= 2.0 mg/L0 10 20 30 40
Perc
ent
incre
ase
in
shell
heig
ht
15
20
25
30
35
40
45
50
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Effects Lab Field
New infections X X
Progression in 1 yr olds X X
Progression in older oysters X
Growth X
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Seager et al. 2000
>95% mortality >95% survival
1 h 0.7 1.5
24h 1.6 3.5
Exposure time vs hypoxia severity – Rainbow trout tested at 12-15oC
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Breitburg et al. in prep – data from DNR shallow water monitoring program
Lethal to most (all?) CB finfish
Frequency of hypoxia near bottom in <2 m of water
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Problem – separating physics from anthropogenic effects
Winds & circulation cause ‘jubilees’; upwelled water will be low in oxygen unless deep-water criteria are changed
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Problem – separating physics from anthropogenic effects
Diel-cycling hypoxia is a natural phenomenon exacerbated by anthropogenic nutrient loads
Mangrove ponds: model systems for studying Mangrove ponds: model systems for studying acidification, hypoxia and increasing water acidification, hypoxia and increasing water temperaturestemperatures
Denise Denise BreitburgBreitburg, , KerynKeryn GedanGedan & & IlkaIlka FellerFeller
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Rhizophora mangle red mangrove
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Chesapeake Bay
Slopes & intercepts almost identical
Panama mangrove ponds
CB data from DNR shallow water monitoring program (sites salinity >7)
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Shallow water is a refuge from deep water hypoxia
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show fish kill show diel cycle Diff from chronic (oyster compensation) But short frequent exposure can also cause chronic problems oyster disease Commonness of diel cycle Diff between minima & avg Problems intrusions = physics diel – how much is anthropogenic intermediate length patterns too (tidal, etc) Shallow water as a refuge we could loose
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