Density-Driven Buoyancy Changes in Waterlogged Wood After Brown Rot Colonization

This fungus can make hardwood light enough to float differently.

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🤯 Did You Know (click to read)

Wood density is a primary determinant of whether timber sinks or floats when waterlogged.

As Laetiporus degrades cellulose within hardwood, overall density decreases due to mass loss and increased porosity. In waterlogged conditions, decayed wood may exhibit altered buoyancy compared to intact timber. The reduction in structural integrity can create pockets that trap air, influencing flotation behavior. While hardwood typically sinks when saturated, advanced brown rot changes internal composition. The physical transformation extends beyond strength to fluid interaction. Laboratory analyses of decayed wood confirm significant density reductions. The fungus reshapes how wood interacts with water at a mechanical level. A submerged log may behave differently after infection.

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💥 Impact (click to read)

Changes in buoyancy affect how woody debris moves through river systems and floodplains. Altered flotation can influence habitat formation and sediment transport. Decayed logs may lodge in different positions than intact ones, reshaping microhabitats. Ecological consequences extend into aquatic environments connected to forests. The biochemical breakdown of cellulose influences hydrodynamics indirectly. Decay alters landscape behavior.

The realization that a fungus can influence how wood floats expands its perceived reach. Decomposition becomes a factor in water movement and habitat structure. A log drifting downstream carries a history of internal chemical change. Observers might attribute movement solely to current strength. Yet density, altered by fungal metabolism, shapes trajectory. Chemistry influences physics across ecosystem boundaries.

Source

USDA Forest Products Laboratory

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