. Deep-ocean biodeterioration of materials. Materials; Marine sediments. Figure 19. Untreated wood bait piece riddled by marine borers. Wood Panels. All the wood specimens were severely damaged by molluscan borers. As shown in Figures 19 and 20, the wood bait pieces which were fitted around the plastic rods and tubes, as well as the plywood panels, were riddled by the borers. These have been identified as Xylophaga washlngtona Bartsch and Xylophaga duplicata Knudsen. The majority of the borers measured about 1/2 inch in diameter (Figure 21). Some of the damaged wood specimens could easily be b
. Deep-ocean biodeterioration of materials. Materials; Marine sediments. Figure 19. Untreated wood bait piece riddled by marine borers. Wood Panels. All the wood specimens were severely damaged by molluscan borers. As shown in Figures 19 and 20, the wood bait pieces which were fitted around the plastic rods and tubes, as well as the plywood panels, were riddled by the borers. These have been identified as Xylophaga washlngtona Bartsch and Xylophaga duplicata Knudsen. The majority of the borers measured about 1/2 inch in diameter (Figure 21). Some of the damaged wood specimens could easily be broken apart by hand. A complete description of the above-mentioned borers Is presented in References 7 and 8. Generally, the wood specimens which were exposed near the sediment were damaged considerably more severely than those specimens which were exposed about 3 feet above the sediment. This Indicates that the deep sea borers are very active in large numbers Immediately above the sediment layer and that their numbers tend to decrease in seawater as the distance from the sediment layer increases. A similar phenomenon has been reported in Reference 9. It is possible that these borers may not be present in seawater about 25 feet above the deep sea floor. It is suggested that deep sea currents play an Important role in the distribution and settlement of larvae on wood. 10 26. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Muraoka, James S; Naval Civil Engineering Laboratory (Port Hueneme, Calif. ). Port Hueneme, Calif. : U. S. Naval Civil Engineering Laboratory
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