Silhouette Analysis of Zooplankton

Goals

Previous Methods

Previous Methods

Say Cheese! : Silhouette Photographic Method

1

2

3

Scanned sample

Scanned sample

Slide 11

Digitizer Method

Slide 13

Menus

Slide 15

Set length lims, colors

20 random sq.

40 random sq.

Adjust colormap

A sample ready to be digitized.

Slide 21

Slide 22

Slide 23

Data file

Edit plate parameters

Slide 26

Slide 27

Lengths histogram - linear

Linear histogram– scale factor 10

Length histogram – log 10,
equal-sized bins

Length histogram –log10 bins (std. dec.)

Standard lengths I

Standard lengths II

Length:Wet Weight Formulas

Excel histogram data:
Counts

Excel histogram data: Weights

Excel histogram data: Lengths

Abundance distribution plot

Biomass distribution plot

Species composition from silhouettes

Sources of Error

Preliminary Biomass Measurement

Displacement Volume Measurement

Sildata vs. dvol plot

Program Requirements

Benefits

Benefits

Benefits

Acknowledgements

Slide 50