Will some birds gain UV vision through gene mutation soon?

I read a book on genetic mutations by Sean Carrol. In one chapter he mentions that some birds cannot see UV light, while others can, and the genetic difference between these two comes down to one base mutation in an opsin gene (eyesight gene). Just one itty-bitty mutation creates UV capability. As I understand it, he saying that some bird species are just one mutation away from gaining UV vision.

To your first question: yes, you understood that correctly. A lot of major changes occur with a single mutation in one coding sequence of DNA.

To your second: the developent of UV vision is dependant on a lot of things. The way I understand it, the main function of UV vision in birds is courtship – male birds with bright plumage often have feathers coloured with uv sensitive pigments, that reflect the uv light rather than absorbing it like regular feathers; the females can see this uv light and the brighter its reflected the more handsom the male appears. However, its not well understood whether UV vision or the pigment evolved first – my guess would be the UV vision evolved first, and pigment after, which would certainly be condusive to other bird species evolving UV vision.

However, since most bird species without UV vision do not have the special UV pigments, there would be no reproductive benefit to having UV vision and the mutation would be unlikely to become fixed in the species so that all (or most) individuals have UV vision. it would also depend on other factors – like how much UV light is in their environment, whether or not predators can see UV light as well (that would make the birds a brightly shining tasty snack!). Evolution is a very complex thing.

Bird Vision UV Paint with Turkey and Patternamster

Butterfly Decal (4 per package) $15.65 ###############################################################################################################################################################################################################################################################…

3 Pairs Kickback Foam Padded Motorcycle Sunglasses $18.99 3 PAIRS: PADDED MOTORCYCLE RIDING GLASSES – DAY NIGHT DAWN DUSK SMOKED CLEAR YELLOW Shatterproof Polycarbonate Lenses Matte black frame UV400 Filter for Maximum UV Protection Scratch Resistant Coating Soft Touch Frame Rubber Ear Pads…

Western Recreation Ind Hog Hunter Decal 4 By 8 Durable Long Lasting Uv-Resistant Vinyl $13.07 PLEASE NOTE: MOST DECALS ARE SOLD IN THE COLOR WHITE. THIS IS THE COLOR THAT STANDS OFF OF TINTED WINDOWS THE BEST….

Western Recreation Ind Vista Bugling Elk Decal 6 By 6 Durable Long Lasting Uv-Resistant Vinyl $13.07 PLEASE NOTE: MOST DECALS ARE SOLD IN THE COLOR WHITE. THIS IS THE COLOR THAT STANDS OFF OF TINTED WINDOWS THE BEST….

Moultrie Feeders Co Moultrie Econo Plus Feeder Unit Abs Plastic Housing Adjustable Feed Setting $50.99 Operates on one 6-volt battery (not included)….