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Marine Fish and Benthos Studies - Knik Arm Bridge and Toll Authority

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Appendix B (cont.)<br />

Table B-5: Statistical Analyses of Invertebrates Sampled with the Surface Tow Net<br />

Variable Taxon Statistic df Significance<br />

Month<br />

Chi-Square<br />

Crangonids 24.12 2 0.000<br />

Amphipoda 1.22 2 0.544<br />

Mysidae 34.82 2 0.000<br />

Isopoda 5.11 2 0.078<br />

Terrestrial Inverts 4.70 2 0.096<br />

All Species 7.26 2 0.027<br />

Transect<br />

Chi-Square<br />

Crangonids 10.23 5 0.069<br />

Amphipoda 9.57 5 0.088<br />

Mysidae 4.48 5 0.483<br />

Isopoda 9.52 5 0.090<br />

Terrestrial Inverts 7.42 5 0.191<br />

All Species 10.66 5 0.058<br />

Tide<br />

Chi-Square<br />

Crangonids 8.53 3 0.036<br />

Amphipoda 0.15 3 0.986<br />

Mysidae 0.84 3 0.841<br />

Isopoda 4.92 3 0.178<br />

Terrestrial Inverts 3.03 3 0.388<br />

All Species 5.43 3 0.143<br />

Station Mann-Whitney Z<br />

(Nearshor Crangonids 520.50 -0.22 0.829<br />

e v. Amphipoda 515.00 -0.29 0.775<br />

Offshore) Mysidae 497.00 -0.52 0.606<br />

Isopoda 525.00 -0.21 0.837<br />

Terrestrial Inverts 507.00 -1.09 0.275<br />

All Species 537.00 -0.01 0.995<br />

Table B-6: Statistical Analyses of Invertebrates Sampled with the Fixed Tow Net<br />

Variable Taxon Statistic Significance<br />

Month Mann-Whitney Z-Value<br />

Crangonids 67.00 -0.28 0.777<br />

Amphipoda 40.00 -1.81 0.070<br />

Mysidae 12.50 -3.37 0.001<br />

Neanthes 67.50 -0.75 0.453<br />

Terrestrial Inverts 67.50 -0.75 0.453<br />

All Species 32.00 -2.26 0.024<br />

Station Chi-Square df<br />

Crangonids 3.60 2 0.165<br />

Amphipoda 3.81 2 0.148<br />

Mysidae 6.49 2 0.039<br />

Neanthes 1.27 2 0.529<br />

Terrestrial Inverts 1.27 2 0.529<br />

All Species 4.73 2 0.094<br />

Tide Chi-Square df<br />

Crangonids 1.42 3 0.700<br />

Amphipoda 0.82 3 0.845<br />

Mysidae 2.10 3 0.551<br />

Neanthes 0.92 3 0.820<br />

Terrestrial Inverts 0.92 3 0.820<br />

All Species 3.31 3 0.346<br />

00214\012\Final Report 11-30-2005\Tables\App B5-6

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