Fishes of the Laguna de Santa Rosa Then, Now, andTomorrow? · Then, Now, and...Tomorrow? Teejay...
Transcript of Fishes of the Laguna de Santa Rosa Then, Now, andTomorrow? · Then, Now, and...Tomorrow? Teejay...
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Fishes of the Laguna de Santa Rosa
Then, Now, and...Tomorrow?
Teejay O’Rear
Graduate Group in Ecology
Wildlife, Fish, and Conservation Biology
U.C. Davis
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Fishes of the Laguna de Santa Rosa
Outline
•Quick Laguna tour
•Then
•Now
•Tomorrow
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Fishes of the Laguna de Santa Rosa
Sebastopol
Rohnert Park
Santa RosaSanta Rosa Creek
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Fishes of the Laguna de Santa Rosa
Background
•Pond-like stream
Main Points?
•Very fertile
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What fish are in there?
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Fishes of the Laguna de Santa Rosa
Then (1988)
•Only one known study of the Laguna’s aquatic community
•CH2MHill – 1988
•7 reaches
•Spring, summer, autumn
•Gillnets and seines
•Zooplankton, invertebrates, water quality
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Fishes of the Laguna de Santa Rosa
Then (1988)
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Fishes of the Laguna de Santa Rosa
Then (1988): Gillnets
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Fishes of the Laguna de Santa Rosa
Then (1988): Seines
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Fishes of the Laguna de Santa Rosa
Then (1988)
Main point? Fish community dominated by species that are tolerant of
•Low dissolved oxygen
•High water temperatures
•Still water
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Fishes of the Laguna de Santa Rosa
2008 Aquatic Community Survey
Purposes
•See if the fish community has changed since 1988
•Determine environmental factors affecting the fish community
•To provide baseline data for management activities
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Fishes of the Laguna de Santa Rosa
Now (2008)
Surveyed
•3 sites in 2 reaches
•On 2 days in August
Collected
•Water-quality data
•Invertebrates via net sweeps
•Fishes via gillnets and seines
•Fishes for gut-content analyses
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Fishes of the Laguna de Santa Rosa
Now (2008)
map
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Fishes of the Laguna de Santa Rosa
Now (2008): Gillnets
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Fishes of the Laguna de Santa Rosa
Now (2008): Seines
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Fishes of the Laguna de Santa Rosa
Then and Now: Gillnets
0
5
10
15
20
25
CARP SBF BC SS GSF BG
Species
20081988
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Fishes of the Laguna de Santa Rosa
Then and Now: Seines
0
50
100
150
200
250
300
MQF LEP LMB SBF SS SC ROA BC STBK BLB CYP FHM
Species
20081988 All Sites1988 ORP and SRLC
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Fishes of the Laguna de Santa Rosa
Now (2008): Gut Content Analyses
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
Fathead Minnow Sacramento BlackfishYOY
Mosquitofish Black Crappie Bluegill YOY Bluegill Age 1+
Species
Bosminidae Cyclopidae Daphniidae Chironomidae larvae Chironomidae pupaeCorixidae Talitridae Poeciliidae Other
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Fishes of the Laguna de Santa Rosa
Now (2008)
Main points?
•Fish community – changed little
•Like 1988, dominated by hardy fishes
•Low DO
•Warm, still water
•Spawn in/on vegetation
•Young/small fishes – feed on zooplankton
•Larger fishes – feed on aquatic insects
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Fishes of the Laguna de Santa Rosa
Now (2008)
Factors structuring fish community
•Low dissolved oxygen
•High water temperatures
•Lack of spawning riffles
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Fishes of the Laguna de Santa Rosa
Tomorrow?
•A little warmer?
•More Ludwigia BHM?
•No restoration?
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Fishes of the Laguna de Santa Rosa
Tomorrow?•A little warmer?
•Less Ludwigia?
•Better water quality?
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Fishes of the Laguna de Santa Rosa
Big-Time Thanks
Bill Cox Amber Manfree
Jason Moore