Based on the notes provided, the most accurate statement that synthesizes the information about blue whales' migration patterns is:
Blue whales travel many thousands of miles when they migrate, as they spend different parts of the year in both tropical and polar waters.
This statement reflects the seasonal behavior of blue whales as their migration involves traveling between warmer tropical waters in the winter and cooler polar waters in the summer. None of the other options accurately encapsulate the primary migration pattern and seasonal habits detailed in the notes.