Ecological aspects of two wood-boring molluscs from the continental terrace off Oregon Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/jw827f591

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  • A mooring system was designed and constructed to make possible the installation and the recovery of racks of sample panels for a study of deep-ocean wood-boring molluscs. Racks containing pine, fir, oak, and cedar boards were exposed to borer attack at six stations with depths of 50, 100, 150, 200, 500 and 1000 meters, all west of Depoe Bay, Oregon. Two wood-boring molluscs, a pholad, Xylophaga washingtona Bartsch, and a teredinid, Bankia setacea (Tyron), were recovered from exposed wood materials. Xylophaga washingtona was the dominant form and was found at all three deep stations. Bankia setacea was found only at the 200-meter site and in very low numbers. This reports the deepest known teredinid actively settling and boring into a test board. Borer attack increased in intensity with time, and in general, decreased with increasing depth. Initial attack appeared to commence right above the line where sample panels were in contact with the sediment. Attack was heaviest in this zone and decreased with increasing distance upward from the sea-sediment interface, approaching zero in about 20 centimeters. In general cedar was the most heavily attacked wood type followed in turn by pine, fir, and then oak, which proved the most resistant to xylophagan borers, The degree of maximum borer penetration into any wood type correlated nicely with the density of the wood, higher density wood being correspondingly most resistant to borer attack. Degree of maximum borer penetration increased with time and decreased with increasing depth. The mooring system is fully described along with a summary of field installation and recovery methods. Future research problems are suggested.
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