Which functional impact results when birds' flight feathers encounter fungal keratin degradation disrupting barb interlocking?

💡 Explanation

When flight feathers break due to fungal keratin degradation, loss of vane integrity occurs which drastically reduces the surface area and airfoil shape effectiveness because barb interlocking is damaged, impairing lift. Therefore, reduced efficiency is expected, rather than other consequences which happen through different avian systems/requirements.

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