Andrew J. Kirk Daniel J. McGarvey
Andrew J. KirkDaniel J. McGarvey
Via Google
INTRODUCTION
Via Google
Ab
un
dan
ce/
Bio
mas
s
Individual Body Mass
SLAUNCH FORKPANTHER WILDLIFE MANAGEMENT AREA, WV
STUDY DESIGN
B l o c k N e t s
E l e c t r o f i s h i n g
STUDY DESIGN
H e s s S a m p l i n g
L e n g t h - M a s s R e g r e s s i o n s
ATAXIC LOG2 BINS
101 mg -200 mg 201 mg – 400 mg 401 mg – 800 mg
Fish Images from IAN UMCES
ZIPPIN MAXIMUM LIKELIHOOD ABUNDANCE
i = pass number
k = number of removals (passes)
Ci = number of fish caught in ith sample
X = intermediate statistic
T= total number of fish caught in all passes
TAXIC BIOMASS SPECTRUM
-7
-5
-3
-1
1
3
5
-3 -2 -1 0 1 2 3 4 5
Overall modelslope = 0.23 intercept = 0.50 r2 = 0.186; df = 31; F = 6.868; P = 0.014
Log 1
0B
(mg
/m2)
Log10 M (mg, taxon average)
Macroinvertebrates
Fish
ATAXIC BIOMASS
0
20
40
60
80
100
120
140
160
0.015625 0.125 1 8 64 512 4096 32768
M (mg, within log2 bins)
B(m
g/m
2)
Macroinvertebrates
Fish
ATAXIC BIOMASS SPECTRUM
-7
-5
-3
-1
1
3
5
-3 -2 -1 0 1 2 3 4 5
Overall modelslope = 0.21 intercept = 1.11 r2 = 0.547; df = 18; F = 20.520; P < 0.001
Log 1
0B
(mg
/m2)
Log10 M (mg, within log2 intervals)
Macroinvertebrates
Fish
ATAXIC NORMALIZED
BIOMASS SPECTRUM
-7
-5
-3
-1
1
3
5
-3 -2 -1 0 1 2 3 4 5
Overall modelslope = -0.79 intercept = 1.28 r2 = 0.947; df = 18; F = 303.491; P < 0.001
Log10 M (mg, within log2 intervals)
Log 1
0n
orm
aliz
ed B
([m
g/m
2]
/ ΔM
) Macroinvertebrates
Fish
COMPARISON OF SPECTRA
-7
-5
-3
-1
1
3
5
-3 -2 -1 0 1 2 3 4 5
Overall modelslope = 0.23 intercept = 0.50 r2 = 0.186; P = 0.014
Log 1
0B
(mg
/m2)
Log10 M (mg, taxon average)
-7
-5
-3
-1
1
3
5
-3 -2 -1 0 1 2 3 4 5
Overall modelslope = -0.79intercept = 1.28r2 = 0.947; P < 0.001
Log10 M (mg, within log2 intervals)
Log 1
0n
orm
aliz
ed B
([m
g/m
2]
/ ΔM
)
Macroinvertebrates
Fish
Analyze Stream Biomass Spectra
Compare Across 4 Seasons
Compare Across 3 Sites
Compare Across 2 Years
ID Emergent Patterns
Compare to Published Size
Spectra
FUTURE OBJECTIVES
QUESTIONS?