WFC 111 Lecture Notes - Lecture 21: Procellariiformes, Oilbird, Photoperiodism

• School: UC-Davis
• Department: Wildlife, Fish, and Conservation Biology
• Course: WFC 111
• Professor: Eadie John

Document Summary

The ancestral vertebrate likely had 4 cones. Most mammals only have 2 (nocturnality) but primates and humans have 3. The human lens filters all uv light. Birds filter light with wavelength-specific oil droplets. High-energy uv wavelengths scatter more than (cid:364)visible" wavelengths (distant uv objects are fuzzy) When light passes through a medium (water, air), it is refracted. Net effect is a series of fuzzy, plane-polarized concentric rings around the sun can be used to determine solar position even on overcast days. Auricular feathers around the ears that act like the outside of a human ear. (cid:364)tub-nosed seabirds(cid:365) with an excellent sense of smell. Can smell their prey in the ocean. Learn the scent of prey from parents. Can keep one eye open and half their brain awake. Three key stressful periods in a bird"s annual cycle. Adjust onset of activities to local conditions. Regulate the timing and physiological changes associated with reproduction, molt.