BIOL 312 Lecture Notes - Lecture 17: Belgica Antarctica, Monarch Butterfly, Namib Desert

• School: University of Victoria
• Department: Biology
• Course: BIOL 312
• Professor: Steve Perlman

Document Summary

Migration: long distance dispersal (persistent movement away from original home range). Monarchs: t(cid:449)o o(cid:448)er(cid:449)i(cid:374)teri(cid:374)g populatio(cid:374)s; me(cid:454)i(cid:272)o (cid:894)easter(cid:374)(cid:895), califor(cid:374)ia (cid:894)(cid:449)ester(cid:374)(cid:895) a(cid:374)d florida (cid:894)do(cid:374)"t (cid:373)igrate(cid:895). Same individual migrates south and north but does not make it all the way back fall migrating individuals are 3-5 generations removed. Virtual migration in tethered flying monarch butterflies reveals their orientation mechanisms (mouritsen a(cid:374)d frost(cid:895). Figure b does(cid:374)"t ha(cid:448)e (cid:373)u(cid:272)h dire(cid:272)tio(cid:374)alit(cid:455) (cid:271)ut c a(cid:374)d d do. Messed up i(cid:374)ter(cid:374)al (cid:271)od(cid:455) (cid:272)lo(cid:272)k so butterflies thought it was a different time of day. When clock- shifted -6 hrs or +6 hrs changes direction. Time-compensated sun compass, no evidence of magnetic compass, monarchs still fly on cloudy days. Experiment to drive butterflies to different location do the(cid:455) k(cid:374)o(cid:449) (cid:449)here the(cid:455)"re goi(cid:374)g i(cid:374) their (cid:373)igrator(cid:455) path or do the(cid:455) si(cid:373)pl(cid:455) head i(cid:374) the n/e/s/w direction they usually do. Monarchs are using a broad constraint as something like the. Following sun and have time compass but not the finest navigation.