Hello,
I am currently learning G. Gershwin's Rhapsody in Blue (by the way, I know Concerto in F and I like it

) and I am wondering about notation after rehearsal 9:

Does the octave mark affect the notes on the lower staff, too? I.e., I mean if the G notes on the lower staff should be played an octave higher than written or not?
Thank you in advance and best regards, Dr