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Vol. 53 - Alaska Resources Library and Information Services

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APPENDIX F<br />

(continued)<br />

Results <strong>and</strong> Discussion<br />

Test 1: The greatest percentage of crabs, 55 percent, was found on the<br />

medium rock substrate; the lowest percentage, 10 percent, was found on<br />

gravel. Although far from conclusive, this simple test indicates a<br />

marked preference for the largest-grained substrate.<br />

Test 2: The greatest percentage of crabs, 40 percent, was found in the<br />

quadrat with tube worms, followed by mussels, then barnacles, then<br />

bryozoans. Crabs were observed in contact with the "reef" materials only<br />

on the tube worms. The results indicate that the epifauna present in<br />

the quadrats may have been more important to the test animals than the<br />

actual bare substrate.<br />

General Comments<br />

A number of variables could not be accounted for in these tests.<br />

Feeding crabs (i.e., hunger) could have been a major factor in Test 2<br />

results. The crabs were left in the aquarium after Test 2 for observation;<br />

some were seen feeding on tube worms <strong>and</strong> scavenging for food<br />

between the mussels.<br />

TABLE Fl<br />

RESULTS OF TEST 1<br />

TABLE F2<br />

RESULTS OF TEST 2<br />

477

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