Fish assemblage
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Fish assemblage Fish assemblage Coldwater Coldwater fishes fishes Cyprinid Cyprinid s s Salmonid Salmonid s s Catostomid Catostomid s s Benthic Benthic fishes fishes
description
Salmonids. Cyprinids. Benthic fishes. Coldwater fishes. Catostomids. Fish assemblage. Scaling of fish assemblages and habitat relationships. Patchiness in fish distribution ( WARM stream). COOL stream. COLD stream. Spatial variability of juvenile chinook in a WARM stream. - PowerPoint PPT Presentation
Transcript of Fish assemblage
Fish assemblageFish assemblage
Coldwater fishesColdwater fishes
CyprinidsCyprinids
SalmonidsSalmonids
CatostomidsCatostomidsBenthic fishesBenthic fishes
Scaling of fish assemblages and habitat Scaling of fish assemblages and habitat
relationshipsrelationships
Patchiness in fish distribution Patchiness in fish distribution ((WARMWARM stream) stream)
COOLCOOL stream stream
COLDCOLD stream stream
Distance upstream (km)
65 75 85 95 105 115
Gra
die
nt (
%)
0.2
0.4
0.6
0.8
1.0
Ma
x. d
ep
th (
m)
0.4
0.5
0.6
0.7
0.8
Ha
bita
t typ
e
1.5
2.0
2.5
3.0
Re
lativ
e a
bu
nd
anc
e
0.0
0.5
1.0
1.5
juvenile chinook
MFJD
max. depth
habitat type
gradient
Spatial Spatial variability of variability of juvenile juvenile chinook in achinook in a WARMWARM streamstream
Middle Fork John Middle Fork John Day RiverDay River
Distance upstream (km)
100 110 120 130 140 150 160
Gra
dien
t (%
)
0.5
1.0
1.5
2.0
Max
. dep
th (
m)
0.2
0.4
0.6
0.8
1.0
1.2
1.4
Hab
itat t
ype
0.5
1.0
1.5
2.0
2.5
Rel
ativ
e ab
unda
nce
0
1
2
3
NFJD
bull trout
juv. chinook
habitat type
max. depth
gradient
North Fork John North Fork John Day RiverDay River
COOLCOOL stream stream
Distance upstream (km)
0 5 10 15 20 25 30 35
Gra
dien
t (%
)
0.4
0.8
1.2
1.6
Max
. dep
th (
m)
0.5
1.0
1.5
2.0
Hab
itat t
ype
2.0
2.5
3.0
Rel
ativ
e ab
unda
nce
0
1
2
3
WENjuv. chinook
bull trout
habitat type
max. depth
gradient
Wenaha RiverWenaha River
COLDCOLD stream stream
MFJD
Distance upstream (km)
60 70 80 90 100 110 120
Axi
s sc
ore
0.04
0.06
0.08
0.10
0.12
0.14Axis 1Axis 2
Multivariate Multivariate analysis of analysis of community community structurestructure in a in aWARMWARM streamstream
Middle Fork John Middle Fork John Day RiverDay River
COOLCOOL streamstream
North Fork John North Fork John Day RiverDay River
NFJD
Distance upstream (km)
100 110 120 130 140 150 160
Axi
s sc
ore
-1.0
-0.5
0.0
0.5
1.0
Axis 1Axis 2
COLDCOLD streamstream
Wenaha RiverWenaha River
WEN
Distance upstream (km)
0 5 10 15 20 25 30 35
Axi
s sc
ore
-1.2
-0.8
-0.4
0.0
0.4
0.8
Axis 1Axis 2
Within-streamWithin-stream variabilityvariability
North Fork John North Fork John Day RiverDay River
Downstream Downstream sectionsection
Scale-dependent relationshipsScale-dependent relationships
Effects of spatial Effects of spatial extent on ecological extent on ecological relationshipsrelationships (Nekola and Wagner 2001)(Nekola and Wagner 2001)
• Thermal crossover Thermal crossover between warm- and between warm- and coldwater species coldwater species 20-22°C 20-22°C
Torgersen, C. E., C. V. Baxter, H. W. Li, and B. A. McIntosh. 2006. Landscape influences on longitudinal patterns of river fishes: Spatially continuous analysis of fish-habitat relationships. Pages 473-492 in R. M. Hughes, L. Wang, and P. W. Seelbach, editors. Landscape influences on stream habitats and biological assemblages. American Fisheries Society, Bethesda, Maryland.
