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Andrew J. Kirk Daniel J. McGarvey
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SFS Presentation_AK_7May2015

Jan 28, 2018

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Page 1: SFS Presentation_AK_7May2015

Andrew J. KirkDaniel J. McGarvey

Page 2: SFS Presentation_AK_7May2015

Via Google

INTRODUCTION

Page 3: SFS Presentation_AK_7May2015

Via Google

Ab

un

dan

ce/

Bio

mas

s

Individual Body Mass

Page 4: SFS Presentation_AK_7May2015

SLAUNCH FORKPANTHER WILDLIFE MANAGEMENT AREA, WV

Page 5: SFS Presentation_AK_7May2015

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

Page 6: SFS Presentation_AK_7May2015

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

Page 7: SFS Presentation_AK_7May2015

ATAXIC LOG2 BINS

101 mg -200 mg 201 mg – 400 mg 401 mg – 800 mg

Fish Images from IAN UMCES

Page 8: SFS Presentation_AK_7May2015

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

Page 9: SFS Presentation_AK_7May2015

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

Page 10: SFS Presentation_AK_7May2015

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

Page 11: SFS Presentation_AK_7May2015

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

Page 12: SFS Presentation_AK_7May2015

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

Page 13: SFS Presentation_AK_7May2015

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

Page 14: SFS Presentation_AK_7May2015

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

Page 15: SFS Presentation_AK_7May2015

QUESTIONS?