Which risk fundamentally escalates as avian migratory flight commences after significant premigratory fat loading?

💡 Explanation

As fat loading increases prior to migration, blood viscosity rises, impacting oxygen delivery, and upon commencement of flight, increased metabolic demands lead to heightened hypoxia. Therefore, hypoxia becomes crucial, rather than predation due to the visibility of large flocks, or heat stress averted by altitude and air sacs, or maneuverability reduced less than alternatives.

• Which function is served by inhibitory signals from larval tissue during insect metamorphosis before imaginal disc differentiation?
• Which outcome of seasonal habitat restriction occurs in migratory bird populations due vocal learning?
• Which outcome manifests when a cuttlefish transitions from a brightly lit to a dimly lit environment?
• Which outcome results when foraging honeybees cannot perform figure-eight waggle properly?
• Which morphological defect arises if imaginal disc apoptosis is inhibited during Drosophila metamorphosis?
• Which outcome results when an invasive plant species secretes abscisic acid in the soil?