krill and krill-predators: habitat associations in the dynamic
TRANSCRIPT
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Krill and Krill-Predators: Habitat associations in the dynamic Gulf of the Farallones, California
J. Jahncke, B.L. Saenz, C. Rintoul and W.J. Sydeman
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IntroductionIntroduction
Euphausiids are a critical source of carbon in marine food webs.
Very little is known about their spatial and temporal distributions, abundance, and reproductive dynamics.
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Krill in the California CurrentKrill in the California Current
Brinton, E. 1981. Euphausiid distributions in the California Current during the warm winter-spring of 1977-78, in the context of a 1949-1966 time series. CalCOFI Rep. 22:135-154.
Euphausia pacifica
Thysanoessa spinifera
E. pacifica
T. spinifera
• More abundant
• Less abundant
• Oceanic and shelf-break
• Shelf
Baja California
San FranciscoJanuary Mar.-Apr. Jun.-Jul.
UPWELLINGx100
Euphausia pacifica
Thysanoessa spinifera
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… there is great spatial andtemporal variability in the relative abundance of these species.
… distribution responds to ENSO (Brinton 1981, Marinovic et al. 2002).
… abundance responds to PDO (Brinton and Townsend 2003).
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The Gulf of the The Gulf of the FarallonesFarallones
Photo: Jan Roletto
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GoalGoal
To determine how seasonal and interannual variability in oceanographic conditions affects the distribution and abundance of krill and krill-predators.
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HypothesisHypothesis
Krill and krill-predators aggregate at predictable locations in the continental shelf and slope waters of the Gulf of the Farallones
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MethodsMethods
•Research cruises onboard the R/V John H. Martin (MLML) •Research cruises onboard the R/V John H. Martin (MLML) •Research cruises onboard the R/V John H. Martin (MLML) •Surveys from May to October 2004 and February to July 2005.•Surveys from May to October 2004 and February to July 2005.•Survey grid, 9 transects (total 300+ km), 3 oceanographic lines.
L2
L4
L6
CordellBank
FarallonesIsland
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MethodsMethods
•Birds/mammals (standardized strip and line transects)•Birds/mammals (standardized strip and line transects)•Birds/mammals (standardized strip and line transects)•Zooplankton/fish (hydroacoustics and nets)•Zooplankton/fish (hydroacoustics and nets)•Oceanography (CTD casts and continuous CT and fluorometery)
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MethodsMethods
4. Krill abundance and distribution
SIMRAD EK-60 with 38, 120, 200 kHz transducersCalculated Fiedlers et al.’ (1998) index of krill abundance as follows:
∆SKrill = 0.5 (Sv120 + Sv200) – Sv38
SKrill not converted to biomass, sample analysis not completed.
SKrill integrated vertically (upper 50-m and 200-m).
We modeled 3 levels of krill and krill-predator abundance in 3-km bins (Log+1 transformed). Forward stepwise ordered logistic regression for the analysis (NS variables were dropped)
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More krill in 2004 than 2005 More krill in 2004 than 2005 (Ordered Logistic Regression, p < 0.01)(Ordered Logistic Regression, p < 0.01)
ResultsResults
-80
-79
-78
-77
-76
-75
-74
2004 2005
Kril
l Up5
0 S
v (d
B/m
²
-69
-68
-67
-66
-65
-64
2004 2005
Kril
l All
Sv
(dB
/m²
Upper 50-m Upper 200-m
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ResultsResults
2004 and 2005 2004 and 2005 were were veryvery different…different…
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Alongshore wind and SST; Bodega (46013)Alongshore wind and SST; Bodega (46013)March to July, 2004
March to July, 2005
Win
d (m
/s)
SST (
° C)
Win
d (m
/s)
SST (
° C)
1.5°C
APRIL
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SST and lowSST and low--level wind anomalies; 2005level wind anomalies; 2005
Figures: Vernon Kousky ([email protected])
+1
+.5
+2+.5
0
0
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Chlorophyll distribution along central CAChlorophyll distribution along central CA
May 2004 May 2005
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Temperature Salinity Fluorescence Krill index
Krill aggregations (… an example)Krill aggregations (… an example)
8
10
12
14
16
Distance (km)
40 20 0
40 20 0
40 20 0
Dep
th (m
) 50
100
150
Dep
th (m
) 50
100
150
Dep
th (m
) 50
100
150
32.2
32.6
33
33.4
33.8
Distance (km)
40 20 0
40 20 0
40 20 0
2
6
10
Distance (km)
40 20 0
40 20 0
40 20 0-85
-75
-65
-55
-45
-35
-25
Distance (km)
40 20 0
40 20 0
40 20 0
Line 2
Line 4
Line 6
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Krill habitat associationsKrill habitat associations
Upper 200-mYearMonthLatitudeIsland (SEFI)Cordell BankDepthSteep bathymetryFluorescence
LR X2 =p =
205.60.001
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Well… so what???Well… so what???
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Salmon with wings Salmon with wings (i.e, (i.e, Cassin’sCassin’s Auklets)Auklets)
Small birds (23 cm; 150-200 g)
Zooplanktivorous 80% krill
Dive 40 m (20-80 m)
Bird productivity is correlated with krill abundance(Abraham and Sydeman 2004)
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0.000.250.500.751.001.251.50
1970 1975 1980 1985 1990 1995 2000 2005
Worst year on record for auklets on SEFIWorst year on record for auklets on SEFI
Mean productivity = 0.70
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Cassin’s auklets distributionMay 2004
May 2005
July 2004
July 2005
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Krill / krillKrill / krill--predator habitat associationspredator habitat associations
Upper 200-mYearMonthLatitudeIsland (SEFI)Cordell BankDepthSteep bathymetryFluorescence
LR X2 =p =
205.60.001
Auklets
54.60.001
=
==
≠≠
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ConclusionsConclusions
1. Unusual weather conditions in 2005 (warmer SST, decreased winds) resulted in low krill and krill predator abundance off central California in 2005 than 2004.
1. Unusual weather conditions in 2005 (warmer SST, decreased winds) resulted in low krill and krill predator abundance off central California in 2005 than 2004.
1. Unusual weather conditions in 2005 (warmer SST, decreased winds) resulted in low krill and krill predator abundance off central California in 2005 than 2004.
2. Krill and krill-predators aggregated at predictable locations near Cordell Bank and other areas of rough topography such as the shelf break and submarine canyons.
2. Krill and krill-predators aggregated at predictable locations near Cordell Bank and other areas of rough topography such as the shelf break and submarine canyons.
• This is a work in progress… (15 cruises, next 3 years)
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AcknowledgementsAcknowledgementsSue Abbott, Jamie Hall, Dave Johnston, Brandy Johnson,
Carol Keiper, Brenna Langabeer, Derek Lee, Shanon Lyday, Jason Yakich, Pete Warzybok, Sophie Webb
Lee Bradford and Kurt Brown, R/V John H. Martin
Bay Model, US Army Corps of EngineersLifeboat Station, Point Reyes National Seashore
Spud Point Marina, Sonoma County Regional Park Mr. George Nunez, Point St. Joseph Fish Company
Jan Roletto, Gulf of the Farallones National Marine Sanctuary Dan Howard, Cordell Bank National Marine Sanctuary
Nina Karnovsky, Pomona CollegeNancy B. Kachel, PMEL/NOAA
Mariano Gutierrez, IMARPE
Krill images provided by GoldenStateImages.com, (C) Randy Morse
Moore Family FoundationResources Legacy Fund Foundation
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