Which group is primarily responsible for rapid attack on untreated wood piles in coastal waters?

• A. Marine Borers
• B. Termites
• C. Carpenter Ants
• D. Fungi

Answer: (A)

This question centers on the organisms that attack wood while it is actually in the marine environment. In coastal waters, rapid attack on untreated wood piles is driven by marine borers, which are specially adapted to living in saltwater and actively bore through wood, quickly weakening the piles.

Marine borers include creatures like shipworms and gribbles that tunnel into wood to feed on the cellulose. Their lifestyle is tied to submerged conditions, so untreated piles exposed to seawater become soft targets for these borers and can deteriorate at a fast rate.

Termites, carpenter ants, and most fungi are associated with wood in terrestrial or moisture-affected settings above or at the surface. Termites typically need wood that’s in contact with soil and ample moisture but not submerged in seawater. Carpenter ants infest dry or damp wood in buildings, not wood permanently underwater. Fungi can decay wood, but underwater or fully submerged conditions limit fungal activity compared with marine borers, which are adapted to constant exposure to seawater.

So the rapid deterioration of untreated coastal wood piles is best explained by marine borers.